Details of a Researcher - MITSUSHIMA Shigenori

Numerical modeling of two-phase flow considering multiple bubble sizes in an alkaline water electrolyzer

Language：English Publishing type：Research paper (scientific journal) Joint Work

Kanemoto, R; Araki, T; Misumi, R; Mitsushima, S

CHEMICAL ENGINEERING SCIENCE 304 2025.2 [Reviewed]

Faster R-CNN-based Detection and Tracking of Hydrogen and Oxygen Bubbles in Alkaline Water Electrolysis

Language：English Publishing type：Research paper (scientific journal) Joint Work

Toyama, K; Kanemoto, R; Misumi, R; Araki, T; Mitsushima, S

ELECTROCHEMISTRY 93 ( 2 ) 027011 - 027011 2025 [Reviewed]

Measurement Methods on Electrodes and Electrocatalysts for Water Electrolysis

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

In this study, a method for detecting and tracking hydrogen and oxygen bubbles during alkaline water electrolysis was developed using Faster R-CNN and DeepSORT. The images required for CNN training were automatically generated by a pseudo-bubble image generation algorithm specifically developed for the purpose of this study. The method was applied to the results of observations on alkaline water electrolysis obtained under various current densities and wire electrode diameters. Evaluation of detection performance using a confusion matrix showed that for the hydrogen evolution reaction (HER) at a current density of 1.0 A cm−2 and a wire electrode diameter of 200 µm, the method achieved a precision of 1.00, recall of 0.840, and F1 score of 0.940, indicating very high detection performance. For the oxygen evolution reaction (OER), bubbles were detected almost perfectly under all conditions, with all detection metrics exceeding 1.00. The proposed method was approximately 20000 times faster than humans. Bubble diameter distribution, total volume, total number, and Sauter mean diameter were obtained and quantitatively assessed, and the relationships between current density and electrode diameter for both HER and OER have been discussed. This method enables accurate, rapid, and automatic quantitative evaluation of visualization results from various alkaline water electrolysis observations, which were previously difficult and labor-intensive to perform manually.

MITSUSHIMA Shigenori, IOROI Tsutomu, KURODA Yoshiyuki, NAGASAWA Kensaku, UCHIYAMA Tomoki, ORIKASA Y … Show more authors

Electrochemistry advpub ( 0 ) 2025 [Reviewed]

DOI CiNii Research

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

Integration of Multifunctionality in a Colloidal Self-Repairing Catalyst for Alkaline Water Electrolysis to Achieve High Activity and Durability

Kuroda Yoshiyuki, Mizukoshi Daiji, Yadav Vinay, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, … Show more authors

Advanced Energy and Sustainability Research 5 ( 11 ) 2024.11 [Reviewed]

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH GmbH Joint Work

Self-repairing catalysts are useful for achieving alkaline water electrolyzers with long lifetimes under intermittent operation. However, rational methodologies for designing self-repairing catalysts have not yet been established. Herein, hybrid cobalt hydroxide nanosheets (Co-ns), with a high deposition (repairing) rate, and β-FeOOH nanorods (Fe-nr), with high oxygen evolution reaction (OER) ability, are electrostatically self-assembled into composite catalysts. This strategy is developed to integrate multifunctionality in self-repairing catalysts. Positively charged Co-ns and negatively charged Fe-nr form uniform composites when dispersed in an electrolyte. These composites are electrochemically deposited on a nickel electrode by electrolysis at 800 mA cm−2. Co-ns form a conductive mesoporous assembly of CoOOH nanosheets as a support. Fe-nr are then distributed on the CoOOH nanosheets as active sites for the OER. Because of the high deposition rate of Co-ns, the amount of Fe-nr deposited increases 22 times compared to when Fe-nr is deposited alone, and the OER current density increases 14 times compared to that of Co-ns alone. The composite self-repair catalyst shows the highest activity and durability under an accelerated durability test (ADT), and its degradation rate decreases from 84 μV cycle−1 (Fe-nr only) to 60 μV cycle−1 (composite catalyst) under ADT conditions without repair.

Water transport across the membrane of a direct toluene electro-hydrogenation electrolyzer: Experiments and modelling

Atienza-Márquez, A; Oi, S; Araki, T; Mitsushima, S

ENERGY 304 2024.9 [Reviewed]

Direct Toluene Electro-hydrogenation Using Anion Exchange Membrane Electrolyzer

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work

SHINOHARA Rio, NAGASAWA Kensaku, KURODA Yoshiyuki, IKEGAMI Kaoru, MITSUSHIMA Shigenori

Electrochemistry 92 ( 9 ) 097003 - 097003 2024.9 [Reviewed]

Proton exchange membrane-like alkaline water electrolysis using fl ow-engineered three-dimensional electrodes.

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

Direct toluene electro-hydrogenation is gaining considerable attention for storing and transporting large amounts of energy. When a proton exchange membrane (PEM) is used in this system, dragged water molecules migrate with the protons from the anode to the cathode, and water inhibits the toluene hydrogenation reaction at the cathode. An anion exchange membrane (AEM) is expected to facilitate the migration of water from the cathode to the anode, and less water suppresses the side reactions. In this study, the quantity of water reaching the cathode is determined. Further, direct toluene electro-hydrogenation without side reactions except hydrogen generation is successfully performed using the AEM. Moreover, optimization of the catalyst loading results in an improved current efficiency exceeding 1.5 mg cm−2. This technology is valuable as a first step in direct toluene electro-hydrogenation using AEM.

Fernando Rocha, Christos Georgiadis, Kevin Van Droogenbroek, Renaud Delmelle, Xavier Pinon, Grzegor … Show more authors

Nature Communications 15 ( 1 ) 7444 2024.8 [Reviewed]

All-Aromatic Polymer-Based Anion Conductive Ionomers with Different Ion Exchange Capacities for Water Electrolysis

Language：English Publishing type：Research paper (scientific journal) Single Work

Other Link： https://www.nature.com/articles/s41467-024-51704-z

Nara, Y; Tomita, M; Nagasawa, K; Kuroda, Y; Mitsushima, S; Kawakami, H; Tanaka, M

ADVANCED ENGINEERING MATERIALS 27 ( 5 ) 2024.8 [Reviewed]

Relationship between bubble generation behavior and hydrogen evolution reaction performance at high current densities during alkaline water electrolysis

Language：English Publishing type：Research paper (scientific journal) Joint Work

Kitajima Daisuke, Misumi Ryuta, Kuroda Yoshiyuki, Mitsushima Shigenori

Electrochimica Acta Early Access 2024.7 [Reviewed]

DOI CiNii Research

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work

Alkaline water electrolysis (AWE) has attracted considerable attention in recent years as a means to produce hydrogen. However, one problem associated with AWE is the increase in overpotential at high current densities, which is attributed to bubble coverage on the electrode surface. It is therefore important to understand the bubble generation behavior to ultimately reduce the overpotential. In this study, a method was established to measure the resistance components from the electrolytic reaction and bubble coating separately based on the use of electrochemical impedance spectroscopy. The results were related to the bubble generation behavior on a Ni electrode, as observed using a high-speed camera. Consequently, a model for the degradation of the electrolytic efficiency due to bubble generation was devised, and the effect of the bubble coverage layer was quantitatively evaluated.

Effects of porous transport layer wettability on performance of proton exchange membrane water electrolyzer: Mass transport overvoltage and visualization of oxygen bubble dynamics with high-speed camera

Kaito Shigemasa, Kodai Wani, Takeshi Nakayama, Konosuke Watanabe, Kohei Wakuda, Ryuhei Shiono, Kota … Show more authors

International Journal of Hydrogen Energy 62 601 - 609 2024.3 [Reviewed]

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Single Work

Enhancement of oxygen evolution reaction in alkaline water electrolysis by Lorentz forces generated by an external magnetic field

Wilton Fogaça, Hayata Ikeda, Ryuta Misumi, Yoshiyuki Kuroda, Shigenori Mitsushima

International Journal of Hydrogen Energy 61 1274 - 1281 2024.3 [Reviewed]

Mesoporous hydrogel electrodes with flexible frameworks exhibiting enhanced mass transport for the oxygen evolution reaction

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Single Work

Nakajima, R; Wago, H; Taniguchi, T; Sasaki, Y; Nishiki, Y; Awaludin, Z; Nakai, T; Kato, A; Mitsushi … Show more authors

CHEMICAL COMMUNICATIONS 60 ( 18 ) 2536 - 2539 2024.2 [Reviewed]

Numerical simulation of the distribution of reverse currents in a practical alkaline water electrolysis stack immediately after electrolysis

Language：English Publishing type：Research paper (scientific journal) Joint Work

Tsukase, N; Araki, T; Haleem, AA; Nagasawa, K; Kuroda, Y; Mitsushima, S

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 49 701 - 712 2024.1 [Reviewed]

Innovative membrane with selective gas permeability for alkaline water electrolysis: Dependable cell performance under industrial conditions

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work

Haleem, AA; Akutagawa, H; Nakayama, S; Bao, Y; Awaludin, Z; Nagasawa, K; Kuroda, Y; Nishiki, Y; Mit … Show more authors

JOURNAL OF POWER SOURCES 587 2023.12 [Reviewed]

In situ X-ray CT visualization of hydrogen bubbles inside the porous transport layer of a direct toluene electro-hydrogenation electrolyzer

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work

Fátima I. Reyna-Peña, Antonio Atienza-Márquez, Sunpil Jang, Ryuhei Shiono, Kaito Shigemasa, Takuto … Show more authors

International Journal of Hydrogen Energy 50 787 - 798 2023.8 [Reviewed]

Principles of Self-Repairing Ability of Tripodal Ligand-Stabilized Hybrid Cobalt Hydroxide Nanosheets for Alkaline Water Electrolysis

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nakajima Ritsuki, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, Awaludin Zaenal, Nakai Takaaki … Show more authors

CHEMSUSCHEM 16 ( 18 ) 2023.7 [Reviewed]

Effect of the cathode catalyst loading on mass transfer in toluene direct electrohydrogenation

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nagasawa Kensaku, Sugita Yuya, Atienza-Marquez Antonio, Kuroda Yoshiyuki, Mitsushima Shigenori

JOURNAL OF ELECTROANALYTICAL CHEMISTRY 938 2023.6 [Reviewed]

Tunable Method for the Preparation of Layered Double Hydroxide Nanoparticles and Mesoporous Mixed Metal Oxide Electrocatalysts for the Oxygen Evolution Reaction

Language：English Publishing type：Research paper (scientific journal) Joint Work

Ferreira Eduardo B. B., Gibaldi Marco, Okada Ryuki, Kuroda Yoshiyuki, Mitsushima Shigenori, Jerkiew … Show more authors

LANGMUIR 39 ( 23 ) 8163 - 8175 2023.5 [Reviewed]

Tunable Method for the Preparation of Layered Double Hydroxide Nanoparticles and Mesoporous Mixed Metal Oxide Electrocatalysts for the Oxygen Evolution Reaction

Language：English Publishing type：Research paper (scientific journal) Joint Work

Ferreira B. Eduardo, Gibaldi Marco, Okada Ryuki, Kuroda Yoshiyuki, Mitsushima Shigenori, Jerkiewicz … Show more authors

Langmuir 39 ( 23 ) 8163 - 8175 2023.5 [Reviewed]

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS) Joint Work

Preparation of high-performance and durable electrocatalysts for anion exchange membrane water electrolysis is a crucial step toward the broad implementation of this technology. Here, we present an easily tunable, one-step hydrothermal method for the preparation of Ni-based (NiX, X = Co, Fe) layered double hydroxide nanoparticles (LDHNPs) for the oxygen evolution reaction (OER), using tris(hydroxymethyl)aminomethane (Tris–NH2) for particle growth control. The LDHNPs are used as building blocks of mesoporous mixed metal oxides (MMOs) with a block copolymer template (Pluronic F127), followed by thermal treatment at 250 °C. NiX MMOs have a significantly larger surface area compared to the analogous LDHNPs. NiX LDHNPs and MMOs exhibit excellent performance and long-term cycling stability, making them promising OER catalysts. Moreover, this versatile method can be easily tailored and scaled up for the preparation of platinum group metal-free electrocatalysts for other reactions of interest, which highlights the relevance of this work to the field of electrocatalysis.

Suppression of Catalyst Layer Detachment by Interfacial Microstructural Modulation of the NiCo2O4/Ni Oxygen Evolution Electrode for Renewable Energy-Powered Alkaline Water Electrolysis

Todoroki Naoto, Nagasawa Kensaku, Enjoji Hayato, Mitsushima Shigenori

ACS APPLIED MATERIALS & INTERFACES 15 ( 20 ) 24399 - 24407 2023.5 [Reviewed]

tert-Butyl-alcohol-induced breakage of the rigid bubble layer that causes overpotential in the oxygen evolution reaction during alkaline water electrolysis

Language：English Publishing type：Research paper (scientific journal) Joint Work

Hayata Ikeda, Ryuta Misumi, Yoshinori Nishiki, Yoshiyuki Kuroda, Shigenori Mitsushima

Electrochimica Acta 452 2023.3 [Reviewed]

Investigation of Charge-Discharging Behavior of Metal Oxide-Based Anode Electrocatalysts for Alkaline Water Electrolysis to Suppress Degradation due to Reverse Current

Language：English Publishing type：Research paper (scientific journal) Single Work

Oda Kazuaki, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCATALYSIS 14 ( 3 ) 499 - 510 2023.2 [Reviewed]

Visualization of dragged water and generated hydrogen bubbles in a direct toluene electro-hydrogenation electrolyzer

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work

Shigemasa Kaito, Atienza-Marquez Antonio, Inoue Kaisei, Jang Sunpil, Reyna Pena Fatima Isabella, Ar … Show more authors

JOURNAL OF POWER SOURCES 554 2023.1 [Reviewed]

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Joint Work

Novel T-shaped Electrodes for PEM Water Electrolysis and Numerical Evaluation of Three-dimensional Potential Distribution

Naruhisa TSUKASE , Konosuke WATANABE, Takuto ARAKI, Kensaku NAGASAWA, Shigenori MITSUSHIMA

Electrochemistry 90 ( 12 ) 127002 2022.12 [Reviewed]

A dual bubble layer model for reactant transfer resistance in alkaline water electrolysis

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Single Work

Ikeda Hayata, Misumi Ryuta, Nishiki Yoshinori, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCHIMICA ACTA 430 2022.8 [Reviewed]

Effects of operation and shutdown parameters and electrode materials on the reverse current phenomenon in alkaline water analyzers

Language：English Publishing type：Research paper (scientific journal) Joint Work

Haleem Ashraf Abdel, Huyan Jinlei, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Kato Akih … Show more authors

JOURNAL OF POWER SOURCES 535 2022.7 [Reviewed]

beta-FeOOH nanorod as a highly active and durable self-repairing anode catalyst for alkaline water electrolysis powered by renewable energy

Language：English Publishing type：Research paper (scientific journal) Joint Work

Kuroda Yoshiyuki, Takatsu Shohei, Taniguchi Tatsuya, Sasaki Yuta, Nagashima Ikuo, Inomata Akihiko, … Show more authors

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 104 ( 3 ) 647 - 658 2022.6 [Reviewed]

Development of highly alkaline stable anion conductive polymers with fluorene backbone for water electrolysis

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Joint Work

A beta-FeOOH nanorod was investigated as a highly active and durable self-repairing anode catalyst for alkaline water electrolysis with repeated potential change, simulating power from renewable energy. The beta-FeOOH nanorod was synthesized by coprecipitation, using an organic buffer of tris(hydroxymethyl)aminomethane. The beta-FeOOH nanorods dispersed in 1 M KOH aq. as an alkaline electrolyte were electrochemically deposited on a nickel electrode by a constant current electrolysis. The deposited beta-FeOOH nanorods formed bundled network on the surface of the electrode and exhibited high oxygen evolution reaction (OER) activity, where the minimum OER overpotential was 285 mV at 100 mA cm(-2). The durability of the nickel electrode coated with beta-FeOOH nanorods were tested via shutdown-based accelerated durability test, where electrolysis at 600 mA cm(-2) for 1 min and the potential control at 0.5 V vs. reversible hydrogen electrode (RHE) for 1 min are repeated in the presence of beta-FeOOH nanorod in the electrolyte. The catalyst coated electrode showed the low OER overpotential for 4000 cycles, whereas the OER overpotential of a bare nickel electrode increased within only 200 cycles. The beta-FeOOH nanorod efficiently suppressed the corrosion of the nickel substrate and the layer of beta-FeOOH nanorod was continuously repaired by accumulating the beta-FeOOH nanorod from the electrolyte. Therefore, the beta-FeOOH nanorod is useful as a self-repairing anode catalyst with high OER activity and durability. [GRAPHICS] .

Nara Yuri, Tanaka Manabu, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima Shigenori, Kawakami Hiroyo … Show more authors

POLYMERS FOR ADVANCED TECHNOLOGIES 33 ( 9 ) 2863 - 2871 2022.5 [Reviewed]

Mechanistic Insights into the Electrocatalytic Hydrogenation of Alkynes on Pt-Pd Electrocatalysts in a Proton-Exchange Membrane Reactor

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nogami Shuji, Shida Naoki, Iguchi Shoji, Nagasawa Kensaku, Inoue Hideo, Yamanaka Ichiro, Mitsushima … Show more authors

ACS CATALYSIS 12 ( 9 ) 5430 - 5440 2022.5 [Reviewed]

State of the Active Site in La1-xSrxCoO3-delta Under Oxygen Evolution Reaction Investigated by Total-Reflection Fluorescence X-Ray Absorption Spectroscopy

Language：English Publishing type：Research paper (scientific journal) Joint Work

Ren Yadan, Oyama Jun, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Takami Tsu … Show more authors

ACS APPLIED ENERGY MATERIALS 5 ( 4 ) 4108 - 4116 2022.4 [Reviewed]

Existence of Dissolved Oxygen near Anode Catalyst in Proton Exchange Membrane Water Electrolyzers

Language：English Publishing type：Research paper (scientific journal) Joint Work

Watanabe Konosuke, Wakuda Kohei, Wani Kodai, Araki Takuto, Nagasawa Kensaku, Mitsushima Shigenori

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 169 ( 4 ) 044515 2022.4 [Reviewed]

Microscopic high-speed video observation of oxygen bubble generation behavior and effects of anode electrode shape on OER performance in alkaline water electrolysis

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Hayata Ikeda, Ryuta Misumi, Yudai Kojima, Ashraf Abdel Haleem, Yoshiyuki Kuroda, Shigenori Mitsushi … Show more authors

International Journal of Hydrogen Energy 47 ( 21 ) 11116 - 11127 2022.3 [Reviewed]

A Novel Evaluation Method of Powder Electrocatalyst for Gas Evolution Reaction

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier {BV} Joint Work

Nagasawa Kensaku, Matsuura Issei, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCHEMISTRY 90 ( 1 ) 017012 - 017012 2022.1 [Reviewed]

Heat and Mass Balance Analysis of 130-W Active-type Direct-methanol Fuel Cell

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

The evaluation of the powder catalyst activity is essential for the development of high-performance electrocatalysts for water electrolysis. However, the gas generated therein interferes with the accurate measurement by covering the catalyst surface. In this study, we have developed a new evaluation method for a powder oxide electrocatalyst using an alkaline electrolyte. This measurement and analysis method can obtain the intrinsic catalyst activity with no influence from the generation of bubbles. To establish this method, the electrolyzer for evaluation adopts the interdigit flow field for the forced-flow method, and the two methods, namely time zero analysis and flow rate infinitization analysis, were demonstrated by the extrapolation of the measurement data. As a result, the combination of forced-flow method and time-zero analysis is the best evaluation method for the determination of kinetic current at time zero as the equivalent of the no-generation gas condition.

Andoh Shinsuke, Kawaji Jun, Suzuki Shuichi, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCHEMISTRY 90 ( 1 ) 017007 - 017007 2022.1 [Reviewed]

Improvement of Time-zero Analysis Method in Activity Evaluation of Powder Electrocatalyst for Gas Evolution Reaction

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

A “heat- and mass-balance analysis” for a direct-methanol fuel cell (DMFC) system, accounting for actual experimental data and the heat- and mass transfer of the DMFC, is proposed to facilitate the usage of general spreadsheet software. The spreadsheet software enables the use of various functions on the data and visualizes the data using graphs. In addition, this application has a light computational load and is thus easy to implement in system control. The output of the analysis is the transfer of material and heat within the DMFC, as well as the heat balance and electrical efficiency of the DMFC. The analysis was verified using experimental data of the DMFC system, and the results of the verification indicated that the analysis could predict heat balance and system efficiency with accuracies of approximately 3.7 and 2.5 %, respectively. Further, the analysis was used to investigate the effect of stack temperature on the electrical efficiency of the system, and the results showed that the optimum stack temperature at a system power of 130 W was 60 °C and the electrical efficiency at that temperature was 21.8 % HHV.

NAGASAWA Kensaku, KUNPENG Li, TAKENAGA Yu, KURODA Yoshiyuki, MITSUSHIMA Shigenori

電気化学および工業物理化学 advpub ( 0 ) 047004 - 047004 2022 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

In this study, we propose a highly accurate catalyst evaluation method by improving the time-zero analysis, which has been reported as an activity evaluation method for gas evolution powder catalysts. We refined the extrapolation approach to plot in this study’s time-zero analysis as an analytical method. The Tafel slopes obtained with this method for LaNiO3 (LNO) were found to be within the reported range, and the data was consistent in catalytic loading range of 2.5–3.3 mg-LNO cm−2. Using the improved time-zero analysis, the kinetic activity of the gas evolution powder catalyst is possible to be evaluated with high accuracy.

Novel T-shaped Electrodes for PEM Water Electrolysis and Numerical Evaluation of Three-dimensional Potential Distribution

Tsukase Naruhisa, Watanabe Konosuke, Araki Takuto, Nagasawa Kensaku, Mitsushima Shigenori

ELECTROCHEMISTRY 90 ( 12 ) 127002 - 127002 2022 [Reviewed]

CaMn7O12 Quadruple Perovskite Oxides Proceed by Two-Active-Site Reaction Mechanism for the Oxygen Evolution Reaction

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

Polymer electrolyte membrane (PEM) water electrolysis has received significant attention as a suitable technology for hydrogen production because it can operate at a high current density, is compact, and can produce high purity hydrogen. However, this process involves high costs because precious metal catalysts are required to maintain high performance. To overcome this challenge and develop new materials to replace precious metals, the complex overlapping overpotentials must be considered separately. In a previous study, a structure that uses double reference electrodes by shifting the electrode arrangement was proposed for separating the overpotentials. This structure allows the electrolyte surface potential to be measured by a reference electrode far from the electrode by changing the potential distribution. However, the structure may cause a complicated three-dimensional potential distribution, which may adversely affects accurate measurement of the electrode potential. Therefore, the potential distribution was analyzed and evaluated using three-dimensional multiphysics simulations incorporating proton and electron conduction. As a result, a remarkable phenomenon called potential wraparound, which affects the distribution of electric potential, was observed. Furthermore, a significant finding was that this effect can be suppressed by changing the shape of the electrode.

Ren Yadan, Kashihara Kodai, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Taka … Show more authors

CHEMELECTROCHEM 8 ( 23 ) 4605 - 4611 2021.12 [Reviewed]

Design and characterization of compact proton exchange membrane water electrolyzer for component evaluation test

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Joint Work

Nagasawa Kensaku, Ishida Taiki, Kashiwagi Hayato, Sano Yosuke, Mitsushima Shigenori

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 ( 74 ) 36619 - 36628 2021.10 [Reviewed]

Quantitative Evaluation of the Activity of Low-Spin Tetravalent Nickel Ion Sites for the Oxygen Evolution Reaction

Language：English Publishing type：Research paper (scientific journal) Joint Work

Ren Yadan, Horiguchi Tomoya, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Tak … Show more authors

ACS APPLIED ENERGY MATERIALS 4 ( 10 ) 10731 - 10738 2021.9 [Reviewed]

Catalytic activity of zirconia on zirconium for the oxygen evolution reaction in potassium hydroxide

Language：English Publishing type：Research paper (scientific journal) Joint Work

Koichi Matsuzawa, Akimitsu Ishihara, Ayaka Oishi, Shigenori Mitsushima, Ken-ichiro Ota

Materials Science & Engineering B 267 115112-1 - 115112-6 2021.3 [Reviewed]

Control of surface area and conductivity of niobium-added titanium oxides as durable supports for cathode of polymer electrolyte fuel cells

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work

It has been reported that the Ni anode electrode used in alkaline water electrolysis (AWE) is degraded when the fluctuating electricity produced by renewable energy (wind and solar power) systems is used. To develop alternative materials, we focused on zirconium oxide because of its high chemical stability, and investigated its catalytic activity for the oxygen evolution reaction (OER) on zirconium oxides on a zirconium plate fabricated by both air oxidation (ZrO2/Zr) and arc-plasma deposition (ZrO2/Zr_APD). From cross-sectional observations and electrochemical results, the mixed tetragonal and monoclinic structure of ZrO2 was related to its catalytic activity for the OER. ZrO2/Zr_APD showed obviously a higher activity than ZrO2/Zr. The reason for this is that the particles are better dispersed in ZrO2/Zr_APD than in ZrO2/Zr, so the electrochemical surface area of ZrO2/ Zr_APD seems to be larger than that of ZrO2/Zr.
1.

Yongbing Ma, Takaaki Nagai, Yuta Inoue, Kaoru Ikegami, Yoshiyuki Kuroda, Koichi Matsuzawa, Teko W. … Show more authors

Materials and Design journal 203 109623-1 - 109632-10 2021.3 [Reviewed]

Practical and Reliable Methanol Concentration Sensor for Direct Methanol Fuel Cells

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work

Niobium-added titaniumoxide is a promising candidate as a substitute carbon support for cathodes ofPEFCs. Nb- added TiO2 can act as a support for platinum nanoparticles to enhance the oxygen reduction reaction (ORR) ac- tivity and durability under acidic conditions. Nb-added TiO2 supports with the desired surface area (10–130 m2 g−1) and conductivity (10−7–10−2 Scm−1) were prepared by changing the amount of Nb and the heat treatment conditions. First, we conducted a systematic investigation with changes in theamount ofniobium addition, heat-treatment temperature, and time under a pure hydrogen atmosphere to reveal the physicochem- ical factors that govern the surface area and conductivity. Finally, we successfully proposed a procedure to pre- pare highly durable Nb-added TiO2 supports with the desired surface area and conductivity by controlling the amount of niobium addition, heat-treatment temperature, and time under hydrogen. The charges of the double layer were almost unchanged after 5000 cycles of an accelerated durability test (ADT).

ANDOH Shinsuke, FUJITA Akira, MIITSU Takeshi, KURODA Yoshiyuki, MITSUSHIMA Shigenori

Electrochemistry 2021.2 [Reviewed]

A New Accelerated Durability Test Protocol for Water Oxidation Electrocatalysts of Renewable Energy Powered Alkaline Water Electrolyzers

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

An electrochemical methanol concentration sensor with practicality and reliability has been developed to apply for a direct methanol fuel cell (DMFC) system. The methanol concentration can be estimated simply by the original algorithm based on the Arrhenius law and diffusion limiting current, even though the complex oxidation current characteristics for the methanol concentration and temperature. The oxidation current of methanol shows linearity against the methanol concentration up to 10 wt% (15 mgPt cm−2 at anode) with quick response. The sensor also has a high durability for 6500 h in the simulated DMFC operating temperature.

Other Link： https://ci.nii.ac.jp/naid/130007988368

Abdel Haleem Ashraf, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Zaenal Awaludin, Mitsus … Show more authors

ELECTROCHEMISTRY 89 ( 2 ) 186 - 191 2021.1 [Reviewed]

The Effect of Cation Mixing in LiNiO2 toward the Oxygen Evolution Reaction

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

For electrocatalysts of oxygen evolution reaction (OER), a new accelerated durability test (ADT) protocol is presented. The protocol is designed to closely mimic the fluctuations of renewable energies. The unit cycle of the current ADT protocol represents the "ON/OFF" operation mode. In the "ON" step, the electrolyzer operates under a DC current of 0.6 A cm−2. In the "OFF" step, the electrocatalyst is subjected to a constant potential that is clearly more cathodic than its OER onset potential (namely, 0.3, 0.5, and 0.7 V vs. RHE) for 10 or 60 s. The transition from the "ON" state to the "OFF" state occurs through a cathodic linear sweep voltammetry of a fast sweep rate to mimic the sudden changes in the renewable power. A NiCoOx/Ni-mesh electrode was used as a case study. The electrode showed remarkable durability under continuous operation (i = 0.6 A cm−2) for about 900 hours. However, it did suffer severe degradation after a certain number of ADT cycles, and the rate of degradation mainly depends on the potential value and the duration of the "OFF" step. Interestingly, the inclusion of the 10-sec open-circuit potential step after the "ON" step clearly mitigates the impact of energy fluctuations on the durability of OER electrocatalysts.

Other Link： https://ci.nii.ac.jp/naid/130007995096

Ren Yadan, Yamaguchi Ryusei, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Mat … Show more authors

CHEMELECTROCHEM 8 ( 1 ) 70 - 76 2021.1 [Reviewed]

Measurement of powdery oxygen evolution reaction catalyst under practical current density using pressure-bonded electrodes

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Joint Work

Tsukada Yudai, Kuroda Yoshiyuki, Niiro Hideaki, Fujii Yuichi, Fujimoto Norikazu, Mitsushima Shigeno … Show more authors

ELECTROCHIMICA ACTA 353 2020.9 [Reviewed]

Highly Selective and Efficient Electrocatalytic Semihydrogenation of Diphenylacetylene in a PEM Reactor with Pt-Pd Alloy Cathode Catalysts

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nogami Shuji, Nagasawa Kensaku, Fukazawa Atsushi, Tanaka Kenta, Mitsushima Shigenori, Atobe Mahito

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 167 ( 15 ) 2020.8 [Reviewed]

Effect of Added Elements into TiO2 on Oxygen Reduction Activity in Acid Media

Language：English Publishing type：Research paper (scientific journal) Joint Work

Akimitsu Ishihara and Takaaki Nagai and Masashi Matsumoto and Masazumi Arao and Yoshiyuki Kuroda an … Show more authors

ECS Transactions 97 ( 7 ) 583 - 592 2020.7 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Other Link： https://doi.org/10.1149/09707.0583ecst

Challenge of advanced low temperature fuel cells based on high degree of freedom of group 4 and 5 metal oxides

Akimitsu Ishihara, Satoshi Tominaka, Shigenori Mitsushima, Hideto Imai, Osamu Sugino, Ken-ichiro Ota

Current Opinion in Electrochemistry 21 234 - 241 2020.3 [Reviewed]

Niobium-added titanium oxides powders as non-noble metal cathodes for polymer electrolyte fuel cells – Electrochemical evaluation and effect of added amount of niobium

Language：English Publishing type：Research paper (scientific journal) Joint Work

Akimitsu Ishihara, Masazumi Arao, Masashi Matsumoto, TsubasaTokai, Takaaki Nagai, Yoshiyuki Kuroda, … Show more authors

International Journal of Hydrogen Energy 45 ( 8 ) 5438 - 5448 2020.2 [Reviewed]

Niobium-added titanium oxides powders as non-noble metal cathodes for polymer electrolyte fuel cells - Electrochemical evaluation and effect of added amount of niobium

Language：English Publishing type：Research paper (scientific journal) Publisher：Science Direct Joint Work

Other Link： https://doi.org/10.1016/j.ijhydene.2019.08.217

Ishihara Akimitsu, Arao Masazumi, Matsumoto Masashi, Tokai Tsubasa, Nagai Takaaki, Kuroda Yoshiyuki … Show more authors

International Journal of Hydrogen Energy 45 ( 8 ) 5438 - 5448 2020.2 [Reviewed]

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd Joint Work

An appropriate evaluation of oxide-based compound powders as non-platinum cathodes for polymer electrolyte fuel cells is required to investigate the active sites of oxide-based cathodes for the oxygen reduction reaction. A mixture of carbon black powder as an electro-conductive material with oxide catalysts that had low electrical conductivity was attempted to evaluate the oxygen reduction reaction (ORR) activity. An appropriate mixture of carbon black and the oxide catalysts let to the electrochemical activation of the oxide surface by the formation of electron, conduction networks. Using the carbon black mixture, the niobium-added titanium oxides heat-treated at 700 degrees C for 10 min under Ar containing 4% hydrogen without carbon materials were focused on to reveal the dependence of ORR activity on the added amount of niobium. The ORR activity of the niobium-added titanium oxides increased the Nb mole percentage from 0 to 20. This was due to the increase in the ratio of the Ti3+/(Ti4++Ti3+), and suggests that the active sites were Ti3+ and/or oxygen vacancies in the anatase phase. On the other hand, although the ratio of the Ti3+/(Ti4++Ti3+) of the oxide with an Nb mole percentage of 30 was almost twice as that with an Nb mole percentage of 20, the ORR activities were almost the same. This might be responsible for the deposition of the amorphous phase composed of Nb2O5, which consisted of a thin layer on the surface of the oxide particles and had low ORR activity. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Current Measurement and Electrochemical Characterization of Gas Evolution Reactions on a Rotating Ring-Disk Electrode

Bao Yun, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCATALYSIS 11 301 - 308 2020.2 [Reviewed]

Toluene permeation through solid polymer electrolyte during toluene direct electro-hydrogenation for energy carrier synthesis

Language：English Publishing type：Research paper (scientific journal) Joint Work

Kensaku Nagasawa, KeisukeTanimoto, Junpei Koike, Kaoru Ikegami, Shigenori Mitsushima

Journal of Power Sources Vol.439 2019.9 [Reviewed]

Self-repairing hybrid nanosheet anode catalysts for alkaline water electrolysis connected with fluctuating renewable energy

Language：English Publishing type：Research paper (scientific journal) Publisher：Science Direct Joint Work

Other Link： https://doi.org/10.1016/j.jpowsour.2019.227070

Yoshiyuki Kuroda, Takeshi Nishimoto, Shigenori Mitsushima

Electrochimica Acta Vol.323 2019.9 [Reviewed]

Emergence of Oxygen Reduction Activity in Zirconium Oxide-Based Compounds in Acidic Media: Creation of Active Sites for the Oxygen Reduction Reaction

Language：English Publishing type：Research paper (scientific journal) Publisher：Science Direct Joint Work

Other Link： https://doi.org/10.1016/j.electacta.2019.134812

Akimitsu Ishihara, Takaaki Nagai, Keisuke Ukita, Masazumi Arao, Masashi Matsumoto, Liwei Yu, Takahi … Show more authors

J. Phys. Chem Vol.123 ( 30 ) 18150 - 18159 2019.7 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：ACS Publications Joint Work

Other Link： https://doi.org/10.1021/acs.jpcc.9b02393

Templated Synthesis of Carbon-Free Mesoporous Magnéli-Phase Titanium Suboxide

Yoshiyuki Kuroda, Hikaru Igarashi, Takaaki Nagai, Teko W. Napporn, Koichi Matsuzawa, Shigenori Mits … Show more authors

Electrocatalysis Vol.10 ( 5 ) 459 - 465 2019.6 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：SpringerLink Joint Work

Kinetics of Toluene Electrohydrogenation on Pt/C Catalyst

Y Bao, TW Napporn, K Nagasawa, S Mitsushima

Electrocatalysis, 2019 10 ( 2 ) 184 - 194 2019.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Joint Work

Factors affecting oxygen reduction activity of Nb2O5-doped TiO2 using carbon nanotubes as support in acidic solution

Akimitsu Ishihara,Chumeng Wu,Takaaki Nagai,Koji Ohara,Kengo Nakada,Koichi MatsuzawaTeko Napporn,Mas … Show more authors

Electrochimica Acta 283 ( 1 ) 1779 - 1788 2018.9 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Dependence of the Reverse Current on the Surface of Electrode Placed on a Bipolar Plate in an Alkaline Water Electrolyzer

Yosuke UCHINO, Takayuki KOBAYASHI, Shinji HASEGAWA, Ikuo NAGASHIMA, Yoshio SUNADA, Akiyoshi MANABE, … Show more authors

Electrochmistry 86 ( 3 ) 138 - 144 2018.5 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Electrocatalytic Hydrogenation of Toluene Using a Proton Exchange Membrane Reactor: Influence of Catalyst Materials on Product Selectivity

Atsushi Fukazawa,Ken Takano,Yoshimasa Matsumura,Kensaku Nagasawa,Shigenori Mitsushima,Mahito Atobe

Bulletin of the Chemical Society of Japan 2018.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

The Effect of Li x Ni2-x O2/Ni with Modification Method on Activity and Durability of Alkaline Water Electrolysis Anode

Sho Fujita,Ikuo Nagashima, Yoshinori Nishiki., Christine Canaff, Teko W. Napporn,Shigenori Mitsushi … Show more authors

Electrocatalysis 9 ( 2 ) 162 - 171 2018.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Relationship Between the Redox Reactions on a Bipolar Plate and Reverse Current After Alkaline Water Electrolysis

Yosuke Uchino,Takayuki Kobayashi,Shinji Hasegawa,Ikuo Nagashima,Yoshio Sunada,Akiyoshi Manabe,Yoshi … Show more authors

Electrocatalysis 9 ( 1 ) 67 - 74 2018.1 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Relationship Between the Redox Reactions on a Bipolar Plate and Reverse Current After Alkaline Water Electrolysis (vol 9, pg 67, 2017)

Uchino Yosuke, Kobayashi Takayuki, Hasegawa Shinji, Nagashima Ikuo, Sunada Yoshio, Manabe Akiyoshi, … Show more authors

ELECTROCATALYSIS 9 ( 1 ) 75 - 75 2018.1

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Oxygen Reduction Activity of TiO2 Single Crystals in Acidic Media

K. Ota,J. Hirata,T. Nagai,M. Arao,M. Matsumoto,Y. Kuroda,K. Matsuzawa,H. Imai,S. Mitsushima,A. Ishi … Show more authors

ECS Transactions 86 ( 13 ) 549 - 558 2018 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Chemical-hydrogenation Functionalized Flow-Field in Toluene Direct Electro-hydrogenation Electrolyzer for Energy-carrier Synthesis System

Kensaku NAGASAWA, Yuki SAWAGUCHI, Akihiro KATO, Yoshinori NISHIKI, Shigenori MITSUSHIMA

Electrochemistry 86 ( 6 ) 339 - 344 2018 [Reviewed]

IMPROVEMENT OF TOLUENE DIRECT ELECTRO-HYDROGENATION ELECTROLYZER FOR ENERGY CARRIER TECHNOLOGY

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nagasawa Kensaku, Koike Junpei, Kuroda Yoshiyuki, Mitsushima Shigenori

グランド再生可能エネルギー国際会議論文集 1 ( 0 ) 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：特定非営利活動法人再生可能エネルギー協議会 Joint Work

Toluene-methylcyclohexane organic chemical hydride has been expected as the energy carrier system for the large-scale transport and storage of hydrogen generated from renewable energy. In this study, we improved the performance of toluene direct electro-hydrogenation electrolyzer. The electrolyzer was optimized for cathode flow-field, the chemical-hydrogenation Pt catalyst in cathode flow-field, and the application of fine mesh anode. Porous-carbon flow-field was the best structure as cathode flow-field. Pt particles loaded cathode flow-field confirmed the function of chemical hydrogenation with toluene and hydrogen. Furthermore, the fining of anode mesh also functioned efficiently. Each modification showed the significant improvement of cell voltage and current efficiency. The conversion from toluene to methylcyclohexane with one-through operation achieved 92 -95%.

Other Link： https://ci.nii.ac.jp/naid/130007608682

Electrocatalytic Activity and Durability of Li x Ni2-x O2/Ni Electrode Prepared by Oxidation with LiOH Melt for Alkaline Water Electrolysis

Sho Fujita,Ikuo Nagashima,Yoshio Sunada,Yoshinori Nishiki,Shigenori Mitsushima

Electrocatalysis 8 ( 5 ) 422 - 429 2017.9 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

The effect of flow-field structure in toluene hydrogenation electrolyzer for energy carrier synthesis system

Kensaku Nagasawa, Akihiro Kato, Yoshinori Nishiki, Yoshimasa Matsumura, Mahito Atobe, Shigenori Mit … Show more authors

Electrochimica Acta 246 459 - 465 2017.8 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work

Rate-Determining Factor of the Performance for Toluene Electrohydrogenation Electrolyzer

Kensaku Nagasawa, Yuki Sawaguchi, Akihiro Kato, Yoshinori Nishiki, Shigenori Mitsushima

Electrocatalysis 8 ( 2 ) 164 - 169 2017.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Zirconium Oxynitride-Catalyzed Oxygen Reduction Reaction at Polymer Electrolyte Fuel Cell Cathodes

Mitsuharu Chisaka, Akimitsu Ishihara, Hiroyuki Morioka, Takaaki Nagai, Shihong Yin, Yoshiro Ohgi, K … Show more authors

ACS Omega 2 ( 2 ) 678 - 684 2017.2 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC Joint Work

Zirconium Oxide-Based Compounds as Non-Platinum Cathodes for Polymer Electrolyte Fuel Cells

Kenichiro Ota, Takaaki Nagai, Takashi Miyazaki, Masashi Matsumoto, Koichi Matsuzawa, Shigenori Mits … Show more authors

ECS Transactions 77 ( 11 ) 1465 - 1472 2017

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Factors Which Affect Oxygen Reduction Activity of Niobium Added Titanium Oxides as Non-Platinum Cathodes for Polymer Electrolyte Fuel Cells

Kenichiro Ota, Takaaki Nagai, Yuko Tamura, Masazumi Arao, Masashi Matsumoto, Koichi Matsuzawa, Hide … Show more authors

ECS Transactions 80 ( 8 ) 717 - 724 2017

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

OER Activity of Ir-Ta-Zr Composite Anode as a Counter Electrode for Electrohydrogenation of Toluene

Kohei Nagai, Kensaku Nagasawa, Shigenori Mitsushima

Electrocatalysis 7 ( 6 ) 441 - 444 2016.11 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work

Electrocatalytic Hydrogenation of O -Xylene in a PEM Reactor as a Study of a Model Reaction for Hydrogen Storage

Ken Takano, Hiroyuki Tateno, Yoshimasa Matsumura, Atsushi Fukazawa, Tsuneo Kashiwagi, Koji Nakabaya … Show more authors

Chemistry Letters 45 ( 12 ) 1437 - 1439 2016.9 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Temperature Dependence of Oxygen Reduction Mechanism on a Titanium Oxide - Based Catalyst Made from Oxy- Titanium Tetra - Pyrazino -Porphyrazine Using Carbon Nano-Tubes as Support in Acidic Solution

Tomoaki Hayashi, Akimitsu Ishihara, Takaaki Nagai, Masazumi Arao, Hideto Imai, Yuji Kohno, Koichi M … Show more authors

Electrochimica Acta 209 1 - 6 2016.8 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD Joint Work

Adsorption Behavior of Low Concentration Carbon Monoxide on Polymer Electrolyte Fuel Cell Anodes for Automotive Applications

Yoshiyuki Matsuda, Takahiro Shimizu, Shigenori Mitsushima

Journal of Power Sources 318 1 - 8 2016.6 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV Joint Work

Electrocatalytic Hydrogenation of Toluene Using a Proton Exchange Membrane Reactor

Ken Takano, Hiroyuki Tateno, Yoshimasa Matsumura, Atsushi Fukazawa, Tsuneo Kashiwagi, Koji Nakabaya … Show more authors

Bulletin of the Chemical Society of Japan 89 ( 10 ) 1178 - 1183 2016.6 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：CHEMICAL SOC JAPAN Joint Work

Titanium-Niobium Oxides Mixed with Ti₄O₇ as Precious-Metal- and Carbon-Free Cathodes for Polymer Electrolyte Fuel Cells

Akimitsu Ishihara, Makoto Hamazaki, Masazumi Arao, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koi … Show more authors

Journal of The Electrochemical Society 163 ( 7 ) F603 - 609 2016.4 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Membrane Electrolysis of Toluene Hydrogenation with Water Decomposition for Energy Carrier Synthesis

Shigenori Mitsushima, Yasutomo Takakuwa, Kensaku Nagasawa, Yuki Sawaguchi, Yuji Kohno, Koichi Matsu … Show more authors

Electrocatalysis 7 127 - 131 2016.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Joint Work

Kinetic study of oxygen reduction reaction on tantalum oxide-based electrocatalysts produced from oxy-tantalum phthalocyanines in acidic media

Electrochimica Acta 182 789 - 794 2015.11 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：International Society of Electrochemistry Joint Work

Tantalum oxide-based electrocatalysts made from oxy-tantalum phthalocyanines as non-platinum cathodes for polymer electrolyte fuel cells

N. Uehara, A. Ishihara, M. Matsumoto, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

Electrochimica Acta 179 146 - 153 2015.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：International Society of Electrochemistry Joint Work

Ti-NbOxide-based Catalysts as Non-platinum Cathodes for PEFC

Yuko Tamura, Akimitsu Ishihara, Mitsuharu Chisaka, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushi … Show more authors

The Journal of Fuel Cell Technology 15 ( 2 ) 79 - 86 2015.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：Fuel Cell Development Information Center Joint Work

Durability of Titanium-niobium Oxides Mixed with Ti4O7 as Non-precious- and Carbon-free Cathodes for PEFCs in H2SO4 at 80oC

M. Hamazaki, A. Ishihara, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota,

Electrochemistry 83 ( 10 ) 817 - 819 2015.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society of Japan Joint Work

Kinetic Study of Oxygen Reduction Reaction in Acid Solution Using Titanium Oxide-Based Catalysts Prepared from Oxy-Titanium Tetra-Pyrazino-Porphyrazine

Electrochemistry 83 ( 10 ) 807 - 809 2015.10 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society of Japan Joint Work

Oxygen Reduction Durability and Activity of Tantalum Oxide-Based Electrocatalysts for Cathode of Polymer Electrolyte Fuel Cells Non-PGM Cathode Catalysts

Koichi Matsuzawa, Akimitsu Ishihara, Naoki Uehara, Yoshio Fujita, Yuji Kohno, Masashi Matsumoto, Yo … Show more authors

ECS Trans. 69 ( 17 ) 3 - 12 2015.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Development of Group 4 and 5 Metal Oxide Cathode with Electron Conductive Oxide Non-PGM Cathode Catalysts

Ken-ichiro Ota, Makoto Hamazaki, Koichi Matsuzawa, Shigenori Mitsushima, and Akimitsu Ishihara

ECS Trans. 69 ( 17 ) 13 - 21 2015.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells

Catalysts 5 ( 3 ) 1289 - 1303 2015.7 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Effect of Reheating Treatment on Oxygen-Reduction Activity and Stability of Zirconium Oxide-Based Electrocatalysts Prepared from Oxy-Zirconium Phthalocyanine for Polymer Electrolyte Fuel Cells

Y. Okada, A. Ishihara, M. Matsumoto, M. Arao, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

Journal of the Electrochemical Society 162 ( 9 ) F959 - F964 2015.6 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochamical Society Joint Work

Oxide-Based Electrocatalysts toward Oxygen Reduction Reaction as Non Pt Cathodes for PEFC

ECS Trans. 64 ( 36 ) 23 - 31 2015.4

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Synthesis of nano-TaOx oxygen reduction reaction catalysts on multi-walled carbon nanotubes connected via a decomposition of oxy-tantalum phthalocyanine

Physical Chemistry Chemical Physics 17 ( 12 ) 7643 - 7647 2015.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

A Simulation Study of Pt Particle Degradation During Potential Cycling Using a Dissolution/Deposition Model

Fumiya Hiraoka, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima

Electrocatalysis 6 ( 1 ) 102 - 108 2015.1 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Oxide-based Elecrocatalysts as Non Precious Metal and Carbon Free Cathodes for PEFC

M. Hamazaki, A. Ishihara, M. Arao, M. Matsumoto, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima. K. … Show more authors

The journal of Fuel Cell Technology 14 ( 2 ) 65 - 73 2014.10 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Fuel Cell Development Information Center Joint Work

Oxide-Based Electrocatalysts as Precious Metal and Carbon Free Cathodes for PEFC

Makoto Hamazaki, Akimitsu Ishihara, M Arao, M Matsumoto, H Imai, Yuji Kohno, Koichi Matsuzawa, Shig … Show more authors

ECS Transactions 64 ( 3 ) 239 - 246 2014.8 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Enhancement of Oxygen Reduction Activity of Titanium Nano-Oxide-Based Electrocatalysts for PEFC Cathode

Tomoaki Hayashi, Akimitsu Ishihara, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koichi Matsuzawa, S … Show more authors

ECS Transactions 64 ( 3 ) 247 - 252 2014.8

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Improvement of the Electrocatalytic Activity of Zirconium Oxide-Based Catalyst for ORR

Yohei Okada, Akimitsu Ishihara, Masazumi Arao, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koichi M … Show more authors

ECS Transactions 64 ( 3 ) 231 - 238 2014.8 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Charge and Mass Transfer on a La2O3 Added Li/Na or Li/K Molten Carbonate Meniscus Electrode of LaNiO3 Coated Au Ring for Oxygen Reduction Reaction

Yuki Takeuchi, Koichi Matsuzawa, Yuji Kohno, Shigenori Mitsushima

ECS Transactions 64 ( 4 ) 635 - 644 2014.8 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Nano-Sized Titanium Oxides As Electrocatalyst for Oxygen Reduction Reaction Toward PEFC

Kazuaki Suito, Akimitsu Ishihara, Tomoaki Hayashi, Masashi Matsumoto, Masazumi Arao, Yuji Kohno, Ko … Show more authors

ECS Transactions 58 ( 47 ) 1 - 7 2014.4

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work

Factors which Affect Oxygen Reduction Activity of Zr Oxide-Based Electrocatalysts for PEFC

Y. Yin,A. Ishihara,M. Arao,M. Matsumoto,H. Imai, Y. Kohno,K. Matsuzawa,S. Mitsushima,K. Ota

The Journal of Fuel Cell Techonology 13 ( 3 ) 93 - 102 2014.3 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Fuel Cell Development Information Center Joint Work

Durability and Activity of Modified Nickel Anode for Alkaline Water Electrolysis

H. Ichikawa, K. Matsuzawa, Y. Kohno, I. Nagashima,Y. Sunada, Y. Nishiki, A. Manabe, S. Mitsushima

ECS Trans. 58 ( 33 ) 9 - 15 2014.2 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Zirconium Oxide-based Cathode Prepared by Partial Oxidation of Carbonitrides as Non-precious Metal Cathode for Polymer Electrolyte Fuel Cells

K. Ota, Y. Ohgi, K. Matsuzawa, S. Mitsushima, and A. Ishihara

ECS Trans. 53 ( 12 ) 1 - 8 2013.11 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Enhancement of Oxygen Reduction Activity of Zirconium Oxide-Based Cathode for PEFC

S. Yin, A. Ishihara, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

ECS Trans. 58 ( 1 ) 1489–1494 2013.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Improving ORR Activity of Group 4 and 5 Metal Oxide-Based Cathodes for PEFCs

A. Ishihara, S. Yin, K. Suito, N. Uehara, Y. Okada, Y. Kohno, K. Matsuzawa, S. Mitsushima, M. Chisa … Show more authors

ECS Trans. 58 ( 1 ) 1495–1500 2013.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Stabilization and Activation of Zirconium Oxide Based Electrocatalysts as PEFC Cathode by Re-Heat Treatment

Y. Okada, A. Ishihara, M. Matsumoto, M. Arao, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

ECS Trans. 58 ( 1 ) 1225–1231 2013.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Activity of Tantalum Oxide-Based Electrocatalysts toward Oxygen Reduction Reaction for PEFC

N. Uehara, A. Ishihara, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

ECS Trans. 58 ( 1 ) 1217–1223 2013.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Effect of SiO2 additive in catalyst layer and electrolyte on the performance of mesothermal fuel cell using room temperature moltan salts

H. Uryu, Y. Kohno, K. Matsuzawa, S. Mitsushima

ECS Trans. 58 ( 1 ) 1353–1360 2013.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work

Emergence of Oxygen Reduction Activity in Partially Oxidized Tantalum Carbonitrides: Roles of Deposited Carbon for Oxygen-Reduction-Reaction-Site Creation and Surface Electron Conduction

A. Ishihara, M. Tamura, Y. Ohgi, M. Matsumoto, K. Matsuzawa, S. Mitsushima, H. Imai, K. Ota

The Journal of Physical Chemistry C 117 ( 37 ) 18837 - 18844 2013.9 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work

Highly Active Titanium Oxide-based Electrocatalyst for Oxygen Reduction Reaction for PEFC

K. Suito,A. Ishihara,M. Arao,M. Matsumoto,H. Imai, Y. Kohno,K. Matsuzawa,S. Mitsushima,K. Ota

The Journal of Fuel Cell Techonology 12 ( 4 ) 130 - 137 2013.4 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Fuel Cell Development Information Center Joint Work

Immersed effects of Ta and Zr compounds on activity of oxygen reduction reaction in sulfuric acid

K. Matsuzawa, K. Nozawa, K. Yamauchi, A. Ishihara, S. Mitsushima, K. Ota

JOURNAL OF POWER SOURCES 226 16 - 19 2013.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Degradation of Pt/C Under Various Potential Cycling Patterns

F. Hiraoka, K. Matsuzawa, S. Mitsushima

Electrocatalysis 4 ( 1 ) 10 - 16 2013.3 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Factors for Improvements of Catalytic Activity of Zirconium Oxide-Based Oxygen-Reduction Electrocatalysts

Ohgi Yoshiro, Ishihara Akimitsu, Matsuzawa Koichi, Mitsushima Shigenori, Ota Ken-ichiro, Matsumoto … Show more authors

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 160 ( 2 ) F162 - F167 2013.2 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Catalytic activity and stability of Ta compounds for oxygen reduction reaction

S. Mitsushima, Y. Fujita, A. Ishihara, Y. Ohgi, K. Matsuzawa, M. Matsumoto, M. Arao, H. Imai, Y. Ko … Show more authors

ECS Transactions 50 ( 2 ) 1823 - 1829 2012.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Highly active titanum oxide-based catalyst for oxygen reduction reaction for PEFC

K. Suito, A. Ishihara, M. Arao, M. Matsumoto, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

ECS Transactions 50 ( 2 ) 1777 - 1783 2012.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

ORR activity of Nb oxide based catalyst prepared from Nb compound including C and N

K. Hara, A. Ishihara, M. Matsumoto, M. Arao, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

ECS Transactions 50 ( 2 ) 1769 - 1775 2012.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Ionic conductivity of [dema][TfO]/solid acid-base composite membrane

A. Fujisawa, K. Matsuzawa, Y. Kohno, S. Mitsushima

ECS Transactions 50 ( 2 ) 1089 - 1095 2012.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Quantitative Analysis of CO2 Generation during Ethanol Electrooxidation on Pt-Sn/C and Pt-SnO2/C

S. Kaneda, K. Matsuzawa, Y. Kohno, S. Mitsushima

ECS Transactions 50 ( 2 ) 1979 - 1986 2012.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Synthesis of highly active Zr oxide-based oxygen reduction reaction electrocayalysis as PEFC cathode

Y. Shihong, A. Ishihara, K. Matsuzawa, S. Mitsushima, K. Ota, M. Matsumoto, M. Arao, H. Imai

ECS Transactions 50 ( 2 ) 1785 - 1790 2012.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Solubilities of La and Ni on LaNiO3 in Li/K Carbonate Eutectic with La2O3

Matsuzawa Koichi, Zhai Shang, Ota Ken-ichiro, Mitsushima Shigenori

CHEMISTRY LETTERS 41 ( 8 ) 817 - 819 2012.8 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Transition Metal Oxide Based Materials for Cathode of Polymer Electrolyte Fuel Cells

Ken-ichiro Ota, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Akimitsu Ishihara

ECS Transactions 45 ( 2 ) 27 - 33 2012.6 [Reviewed]

Oxygen reduction reaction on tantalum oxide-based catalysts prepared from TaC and TaN

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Ta Compound Film as New Anode Material for Polymer Electrolyte Water Electrolysis

K. Yamauchi, K. Matsuzawa, S. Mitsushima, K. Ota

ECS Transactions 41 ( 17 ) 21 - 25 2012.5 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Ma … Show more authors

Electrochimica Acta 68 192 - 197 2012.4 [Reviewed]

Pt-Ir-SnO2/C Electrocatalysts for Ethanol Oxidation in Acidic Media

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/00134686

Lianhua Zhao, Shigenori Mitsushima, Akimitsu Ishihara, Koichi Matsuzawa, and Ken-ichiro Ota

Chinese Journal of Catalysis 32 ( 11-12 ) 1856 - 1863 2011.11 [Reviewed]

Catalytic Activity for Oxygen Reduction Reaction on Tantalum Oxide-Based Compounds (2) Active Sites of TaON Thin Film Catalysts and Role of Carbon

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://linkinghub.elsevier.com/retrieve/pii/S1872206710602975

Akimitsu Ishihara, Akifumi Kikuchi, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichir … Show more authors

J. Japan Inst. Metals 75 ( 10 ) 552 - 556 2011.10 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.jim.or.jp/journal/j/

Catalytic Activity for Oxygen Reduction Reaction on Tantalum Oxide-Based Compounds (1) Effect of Preparation Conditions of Thin Film Model Catalysts Using Reactive Sputtering Method on Oxygen Reduction Activity

Akifumi Kikuchi, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Masashi M … Show more authors

J. Japan Inst. Metals 75 ( 10 ) 545 - 551 2011.10 [Reviewed]

Partially Oxidized Tantalum Carbonitride as New Cathodes Without Platinum Group Metals for Polymer Electrolyte Fuel Cell

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.jim.or.jp/journal/j/

Akimitsu Ishihara, Motoko Tamura, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota.

Journal of Fuel Cell Science and Technology 8 ( 3 ) 2011.10

Development of group 4 and 5 metal oxide-based cathodes for polymer electrolyte fuel cell

Language：English Publishing type：Research paper (other science council materials etc.) Joint Work

Other Link： http://asmedl.org/FuelCell

Ken-ichiro Ota, Yoshiro Ohgi, Kyung-Don Nam, Koichi Matsuzawa, Shigenori Mitsushima, and Akimitsu I … Show more authors

Journal of Power Sources 196 ( 12 ) 5256 - 5263 2011.6 [Reviewed]

Zirconium Oxide-Based Compounds as Non-Pt Cathode for Polymer Electrolyte Fuel Cell

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://linkinghub.elsevier.com/retrieve/pii/S0378775310016241

Keisuke Ukita, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ich … Show more authors

Electrochemistry 79 ( 5 ) 340 - 342 2011.5 [Reviewed]

Quantitative Analysis of Electrooxidation Products on Platinum for Direct Ethanol Fuel Cell.

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://edit.electrochem.jp/

Koichi Matsuzawa, Tomoaki Takahashi, Akimitsu Ishihara, Shigenori Mitsushima, and Ken-ichiro Ota

Electrochemistry 79 ( 5 ) 419 - 423 2011.5 [Reviewed]

A Mesothermal Fuel Cell using Diethylmethylammonium Trifluoromethanesulfonate Absorbed Membrane with H3PO4 addition and Various Amount of Electrolyte Loading in Catalyst Layer

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://edit.electrochem.jp/

Daisuke Inoue, Shigenori Mitsushima, Koichi Matsuzawa, Seung-Yul Lee, Tomohiro Yasuda, Masayoshi Wa … Show more authors

Electrochemistry 79 ( 5 ) 377 - 380 2011.5 [Reviewed]

Separation of Oxygen Reduction Reaction from Total Reduction Current on Pt/C Using Rotating Ring Disk Electrode

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://edit.electrochem.jp/

Shigenori MITSUSHIMA,Yoshio FUJITA,Yoshiki NAGAHARA,Seiho SUGAWARA,Koichi MATSUZAWA,Kazuhiko SHINOH … Show more authors

Electrochemistry 79 ( 1 ) 24 2011.1 [Reviewed]

Simultaneous Electrochemical Measurement of Oxygen Reduction and Pt Oxide Formation/Reduction on Pt Nanoparticle Surface

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://edit.electrochem.jp/

Seiho Sugawara, Kohei Tsujita, Shigenori Mitsushima, Kazuhiko Shinohara, and Ken-ichiro Ota

Electrocatalysis 2 ( 1 ) 60 - 68 2010.12 [Reviewed]

Hydrogen Energy System and Environment Impact Factor

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.springerlink.com/index/10.1007/s12678-010-0036-8

Ken-ichiro Ota, Akimitsu Ishihara, Koichi Matsuzawa, and Shigenori Mitsushima

Electrochemistry 78 ( 12 ) 970 - 975 2010.12 [Reviewed]

Progress in non-precious metal oxide-based cathode for polymer electrolyte fuel cells

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://edit.electrochem.jp/

Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota.

Electrochimica Acta 55 ( 27 ) 8008 - 8012 2010.11 [Reviewed]

Tantalum oxide-based compounds as new non-noble cathodes for polymer

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/00134686

A. Ishihara, Y. Ohgi, K. Matsuzawa, S. Mitsushima, K. Ota

Electrochimica Acta 55 ( 27 ) 7581 - 7589 2010.11 [Reviewed]

Mass Transportation in Diethylmethylammonium Trifluoromethanesulfonate for Fuel Cell Applications

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/00134686

S. Mitsushima, Y. Shinohara, K. Matsuzawa, K. Ota

Electrochimica Acta 55 6639 - 6644 2010.9 [Reviewed]

The influence of polymer electrolyte fuel cell cathode degradation on the electrode polarization

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/00134686

Zirconium Oxide - Based Compound as New Cathode Without Platinum Group Metals for PEFC

Y. Ohgi, A. Ishihara, K. Matsuzawa, S. Mitsushima, K. Ota

Journal of the Electrochemical Society 157 B885 - B891 2010.6 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

T. Aoki, A. Matsunaga, Y. Ogami, A. Maekawa, S. Mitsushima, K. Ota, H. Nishikawa

Journal of Power Sources 195 2182 - 2188 2010.4 [Reviewed]

Influence of sputtering power on oxygen reduction reaction activity of zirconium oxides prepared by radio frequency reactive sputtering

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/03787753

Y. Liu, A. Ishihara, S. Mitsushima, K. Ota

Electrochimica Acta 55 1239 - 1244 2010.1 [Reviewed]

Partially Oxidized Niobium Carbonitride as Non-Platinum Cathode for PEFC

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/00134686

Nam, Kyung Don; Ishihara, Akimitsu; Matsuzawa, Koichi; Mitsushima, Shigenori; Ota, Ken-ichiro.

Electrochemical and Solid-State Letters 12 ( 11 ) B158 - B2160 2009.11 [Reviewed]

Tantalum Oxide-based Cathodes without Precious Metals for PEFC

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.ecsdl.org/ESL

Akimitsu Ishihara, Hideto Imai, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota

ECS Transactions 25 ( 1 ) 175 - 180 2009.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Other Link： http://www.ecsdl.org/ECST

Zirconium Oxide-based Cathode without Platinum Group Metals for PEFC

Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota

ECS Transactions 25 ( 1 ) 129 - 139 2009.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Other Link： http://www.ecsdl.org/ECST

Performance decay of proton-exchange membrane fuel cells under open circuit conditions induced by membrane decomposition.

Sugawara, Seiho; Maruyama, Takao; Nagahara, Yoshiki; Kocha, Shyam S.; Shinohra, Kazuhiko; Tsujita, … Show more authors

Journal of Power Sources 187 ( 2 ) 324 - 331 2009.2 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/03787753

Tantalum-based Compounds Prepared by Reactive Sputtering as a New Non-platinum Cathode for PEFC

A. Kikuchi, A. Ishihara, K. Matsuzawa, S. Mitsushima, K. Ota

Chemistry Letters 38 1184 - 1185 2009.1 [Reviewed]

Dissolution of platinum in acidic media

Language：English Publishing type：Research paper (scientific journal) Joint Work

Shigenori Mitsushima, Yuki Koizumi, Shunsuke Uzuka, Ken-Ichiro Ota

Electrochimica Acta 54 ( 2 ) 455–460 2008.12 [Reviewed]

The Effect of Pt: Ru Ratio of Thermal Alloying PtRu Catalyst on CO-tolerance

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.sciencedirect.com/science/journal/00134686

T. Tada, Y. Yamamoto, S. Mitsushima. K. Ota

Electrochemistry 76 ( 11 ) 813 - 823 2008.11 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://edit.electrochem.jp/

Group 4 and 5 Oxide-based Compounds as New Cathodes without Platinum Group Metals for PEFC

Akimitsu Ishihara, Motoko Tamura, Youta Maekawa, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushi … Show more authors

ECS Transactions 16 ( 2 ) 449 2008.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Other Link： http://www.ecsdl.org/ECST

Efficiency of CO2 Generation during the Electrooxidation of Ethanol on Platinum with Various Roughness Factors

Shigenori Mitsushima, Tomoaki Takahashi, Azreena Ariffin, Koichi Matsuzawa, Akimitsu Ishihara, and … Show more authors

ECS Transactions 16 ( 2 ) 1253 2008.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Joint Work

Other Link： http://www.ecsdl.org/ECST

Catalytic Activity of Zirconium Oxynitride Prepared by Reactive Sputtering for ORR in Sulfric Acid

Y. Maekawa, A. Ishihara, J-H. Kim, S. Mitsushima, and K-I. Ota

Electrochemical and Solid-State Letters 11 ( 7 ) B109 - B112 2008.7 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Joint Work

Other Link： http://www.ecsdl.org/ESL

Catalytic Activity of Partially Oxidized Transition-metal Carbide-Nitride for Oxygen Reduction Reaction in Sulfuric Acid

Yoshiro Ohgi, Akimitsu Ishihara, Yohei Shibata, Shigenori Mitsushima, and Ken-ichiro Ota

Chemistry Letters 37 ( 6 ) 608 - 609 2008.6 [Reviewed]