研究者詳細 - 光島　重徳

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

CHEMICAL ENGINEERING SCIENCE 304 2025年2月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

ELECTROCHEMISTRY 93 ( 2 ) 027011 - 027011 2025年 [査読有り]

Measurement Methods on Electrodes and Electrocatalysts for Water Electrolysis

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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 … 全著者表示

Electrochemistry advpub ( 0 ) 2025年 [査読有り]

DOI CiNii Research

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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, … 全著者表示

Advanced Energy and Sustainability Research 5 ( 11 ) 2024年11月 [査読有り]

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley-VCH GmbH 共著

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年9月 [査読有り]

Direct Toluene Electro-hydrogenation Using Anion Exchange Membrane Electrolyzer

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Electrochemistry 92 ( 9 ) 097003 - 097003 2024年9月 [査読有り]

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

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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 … 全著者表示

Nature Communications 15 ( 1 ) 7444 2024年8月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： 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年8月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Kitajima Daisuke, Misumi Ryuta, Kuroda Yoshiyuki, Mitsushima Shigenori

Electrochimica Acta Early Access 2024年7月 [査読有り]

DOI CiNii Research

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 共著

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 … 全著者表示

International Journal of Hydrogen Energy 62 601 - 609 2024年3月 [査読有り]

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

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年3月 [査読有り]

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

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

Nakajima, R; Wago, H; Taniguchi, T; Sasaki, Y; Nishiki, Y; Awaludin, Z; Nakai, T; Kato, A; Mitsushi … 全著者表示

CHEMICAL COMMUNICATIONS 60 ( 18 ) 2536 - 2539 2024年2月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 49 701 - 712 2024年1月 [査読有り]

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

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

Haleem, AA; Akutagawa, H; Nakayama, S; Bao, Y; Awaludin, Z; Nagasawa, K; Kuroda, Y; Nishiki, Y; Mit … 全著者表示

JOURNAL OF POWER SOURCES 587 2023年12月 [査読有り]

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

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

Fátima I. Reyna-Peña, Antonio Atienza-Márquez, Sunpil Jang, Ryuhei Shiono, Kaito Shigemasa, Takuto … 全著者表示

International Journal of Hydrogen Energy 50 787 - 798 2023年8月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Nakajima Ritsuki, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, Awaludin Zaenal, Nakai Takaaki … 全著者表示

CHEMSUSCHEM 16 ( 18 ) 2023年7月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

JOURNAL OF ELECTROANALYTICAL CHEMISTRY 938 2023年6月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ferreira Eduardo B. B., Gibaldi Marco, Okada Ryuki, Kuroda Yoshiyuki, Mitsushima Shigenori, Jerkiew … 全著者表示

LANGMUIR 39 ( 23 ) 8163 - 8175 2023年5月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ferreira B. Eduardo, Gibaldi Marco, Okada Ryuki, Kuroda Yoshiyuki, Mitsushima Shigenori, Jerkiewicz … 全著者表示

Langmuir 39 ( 23 ) 8163 - 8175 2023年5月 [査読有り]

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 共著

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年5月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Electrochimica Acta 452 2023年3月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Oda Kazuaki, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCATALYSIS 14 ( 3 ) 499 - 510 2023年2月 [査読有り]

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

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

Shigemasa Kaito, Atienza-Marquez Antonio, Inoue Kaisei, Jang Sunpil, Reyna Pena Fatima Isabella, Ar … 全著者表示

JOURNAL OF POWER SOURCES 554 2023年1月 [査読有り]

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年12月 [査読有り]

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

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

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

ELECTROCHIMICA ACTA 430 2022年8月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Haleem Ashraf Abdel, Huyan Jinlei, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Kato Akih … 全著者表示

JOURNAL OF POWER SOURCES 535 2022年7月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Kuroda Yoshiyuki, Takatsu Shohei, Taniguchi Tatsuya, Sasaki Yuta, Nagashima Ikuo, Inomata Akihiko, … 全著者表示

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 104 ( 3 ) 647 - 658 2022年6月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer 共著

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 … 全著者表示

POLYMERS FOR ADVANCED TECHNOLOGIES 33 ( 9 ) 2863 - 2871 2022年5月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Nogami Shuji, Shida Naoki, Iguchi Shoji, Nagasawa Kensaku, Inoue Hideo, Yamanaka Ichiro, Mitsushima … 全著者表示

ACS CATALYSIS 12 ( 9 ) 5430 - 5440 2022年5月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ren Yadan, Oyama Jun, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Takami Tsu … 全著者表示

ACS APPLIED ENERGY MATERIALS 5 ( 4 ) 4108 - 4116 2022年4月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 169 ( 4 ) 044515 2022年4月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Electrochemical Society 共著

Hayata Ikeda, Ryuta Misumi, Yudai Kojima, Ashraf Abdel Haleem, Yoshiyuki Kuroda, Shigenori Mitsushi … 全著者表示

International Journal of Hydrogen Energy 47 ( 21 ) 11116 - 11127 2022年3月 [査読有り]

A Novel Evaluation Method of Powder Electrocatalyst for Gas Evolution Reaction

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier {BV} 共著

Nagasawa Kensaku, Matsuura Issei, Kuroda Yoshiyuki, Mitsushima Shigenori

ELECTROCHEMISTRY 90 ( 1 ) 017012 - 017012 2022年1月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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年1月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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年 [査読有り]

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

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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 … 全著者表示

CHEMELECTROCHEM 8 ( 23 ) 4605 - 4611 2021年12月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley 共著

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

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 ( 74 ) 36619 - 36628 2021年10月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ren Yadan, Horiguchi Tomoya, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Tak … 全著者表示

ACS APPLIED ENERGY MATERIALS 4 ( 10 ) 10731 - 10738 2021年9月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Materials Science & Engineering B 267 115112-1 - 115112-6 2021年3月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 共著

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. … 全著者表示

Materials and Design journal 203 109623-1 - 109632-10 2021年3月 [査読有り]

Practical and Reliable Methanol Concentration Sensor for Direct Methanol Fuel Cells

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 共著

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年2月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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.

その他リンク： https://ci.nii.ac.jp/naid/130007988368

Abdel Haleem Ashraf, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Zaenal Awaludin, Mitsus … 全著者表示

ELECTROCHEMISTRY 89 ( 2 ) 186 - 191 2021年1月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

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.

その他リンク： https://ci.nii.ac.jp/naid/130007995096

Ren Yadan, Yamaguchi Ryusei, Uchiyama Tomoki, Orikasa Yuki, Watanabe Toshiki, Yamamoto Kentaro, Mat … 全著者表示

CHEMELECTROCHEM 8 ( 1 ) 70 - 76 2021年1月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley 共著

Tsukada Yudai, Kuroda Yoshiyuki, Niiro Hideaki, Fujii Yuichi, Fujimoto Norikazu, Mitsushima Shigeno … 全著者表示

ELECTROCHIMICA ACTA 353 2020年9月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 167 ( 15 ) 2020年8月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Akimitsu Ishihara and Takaaki Nagai and Masashi Matsumoto and Masazumi Arao and Yoshiyuki Kuroda an … 全著者表示

ECS Transactions 97 ( 7 ) 583 - 592 2020年7月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：The Electrochemical Society 共著

その他リンク： 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年3月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Akimitsu Ishihara, Masazumi Arao, Masashi Matsumoto, TsubasaTokai, Takaaki Nagai, Yoshiyuki Kuroda, … 全著者表示

International Journal of Hydrogen Energy 45 ( 8 ) 5438 - 5448 2020年2月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Science Direct 共著

その他リンク： https://doi.org/10.1016/j.ijhydene.2019.08.217

Ishihara Akimitsu, Arao Masazumi, Matsumoto Masashi, Tokai Tsubasa, Nagai Takaaki, Kuroda Yoshiyuki … 全著者表示

International Journal of Hydrogen Energy 45 ( 8 ) 5438 - 5448 2020年2月 [査読有り]

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Pergamon-Elsevier Science Ltd 共著

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年2月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Journal of Power Sources Vol.439 2019年9月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Science Direct 共著

その他リンク： https://doi.org/10.1016/j.jpowsour.2019.227070

Yoshiyuki Kuroda, Takeshi Nishimoto, Shigenori Mitsushima

Electrochimica Acta Vol.323 2019年9月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Science Direct 共著

その他リンク： https://doi.org/10.1016/j.electacta.2019.134812

Akimitsu Ishihara, Takaaki Nagai, Keisuke Ukita, Masazumi Arao, Masashi Matsumoto, Liwei Yu, Takahi … 全著者表示

J. Phys. Chem Vol.123 ( 30 ) 18150 - 18159 2019年7月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Publications 共著

その他リンク： 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 … 全著者表示

Electrocatalysis Vol.10 ( 5 ) 459 - 465 2019年6月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SpringerLink 共著

Kinetics of Toluene Electrohydrogenation on Pt/C Catalyst

Y Bao, TW Napporn, K Nagasawa, S Mitsushima

Electrocatalysis, 2019 10 ( 2 ) 184 - 194 2019年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer 共著

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 … 全著者表示

Electrochimica Acta 283 ( 1 ) 1779 - 1788 2018年9月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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, … 全著者表示

Electrochmistry 86 ( 3 ) 138 - 144 2018年5月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Electrocatalysis 9 ( 2 ) 162 - 171 2018年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Electrocatalysis 9 ( 1 ) 67 - 74 2018年1月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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, … 全著者表示

ELECTROCATALYSIS 9 ( 1 ) 75 - 75 2018年1月

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

ECS Transactions 86 ( 13 ) 549 - 558 2018年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：特定非営利活動法人再生可能エネルギー協議会共著

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%.

その他リンク： 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年9月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Electrochimica Acta 246 459 - 465 2017年8月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

トルエン電解水素化電解槽のカソード分極は物質移動が支配的で副反応としての水素発生反応と密接に関係すること、アノード分極は酸素発生反応自体にあることを定量的に明らかにした。

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 … 全著者表示

ACS Omega 2 ( 2 ) 678 - 684 2017年2月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

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 … 全著者表示

ECS Transactions 77 ( 11 ) 1465 - 1472 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

Kenichiro Ota, Takaaki Nagai, Takashi Miyazaki, Masashi Matsumoto, Koichi Matsuzawa, Shigenori Mitsushima, Hideto Imai, Akimitsu Ishihara

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 … 全著者表示

ECS Transactions 80 ( 8 ) 717 - 724 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年11月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER 共著

トルエンの電解水素化電解槽の対極反応は酸性電解質中でのトルエン共存下での酸素発生である。Ir50TaxZr50-x/Ti電極のトルエン飽和硫酸中での酸素発生について検討した結果、本系はトルエンによる被毒の程度が小さかった。また、Ir50Ta20Zr30/Tiが最も高い電極活性を示した。

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 … 全著者表示

Chemistry Letters 45 ( 12 ) 1437 - 1439 2016年9月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Electrochimica Acta 209 1 - 6 2016年8月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD 共著

Oxy-titanium tetra-pyrazino- porphyrazineをプリカーサとして調製したTiO2系触媒担持マルチウォールカーボンナノチューブ触媒の酸素還元触媒活性の温度依存性を回転リングディスク法により評価した。4電子反応及び2電子反応の活性化エネルギーは両者とも45.5 kJmol-1であった。

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年6月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV 共著

燃料電池自動車用の燃料に不純物として含まれる0.2 ppm程度のCOの挙動について検討した。カソードにN2を供給した時とAirを供給したときの差から、Ptに吸着したCOはカソードから透過してくるO2で酸化されてCO2となり脱離すると考えられる。

Electrocatalytic Hydrogenation of Toluene Using a Proton Exchange Membrane Reactor

Ken Takano, Hiroyuki Tateno, Yoshimasa Matsumura, Atsushi Fukazawa, Tsuneo Kashiwagi, Koji Nakabaya … 全著者表示

Bulletin of the Chemical Society of Japan 89 ( 10 ) 1178 - 1183 2016年6月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN 共著

Pt/C、Ph/C、Ru/C、Pd/C、PtRu/Cについて、トルエンの電解水素化の触媒能及び反応選択性を評価した。PtRu/Cが最も高い水素化電流効率を示し、Pd/Cは殆ど水素発生で水素化は殆ど観察できなかった。また、水素以外の副生成物は認められなかった。

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 … 全著者表示

Journal of The Electrochemical Society 163 ( 7 ) F603 - 609 2016年4月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

4，5属遷移金属酸化物系の酸素還元用電極触媒として、Ti4O7系の担体にTixNbyOz系触媒を担持した触媒を分散する系を提案した。本系はTi4O7と比較して非常に活性が高かったことから、Ti4O7 が電子伝導パスを、TixNbyOzが活性点を担っていると考えられる。

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

Shigenori Mitsushima, Yasutomo Takakuwa, Kensaku Nagasawa, Yuki Sawaguchi, Yuji Kohno, Koichi Matsu … 全著者表示

Electrocatalysis 7 127 - 131 2016年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

隔膜にフッ素系カチオン交換膜、アノードに固体高分子形燃料電池と同様の貴金属担持カーボン触媒層、アノードに酸素発生用DSE電極を用いた膜電解槽のカソードにトルエン、アノードに硫酸を供給し、カソードでトルエンの直接電解水素化、アノードで酸素発生を行う電解槽でエネルギーキャリアであるトルエンの水素化を行うプロセスを提案した。本系ではPt/CよりもPtRu/Cの方が水素化触媒活性は高かった。また、アノード側の電解質膜を親水化するとアノード-電解質膜間に発生した酸素ガスが留まることなく排出できるため電極間距離の削減が可能で電解槽性能が向上した。

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

N. Uehara, A. Ishihara, T. Nagai, M. Matsumoto, H. Imai, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. … 全著者表示

Electrochimica Acta 182 789 - 794 2015年11月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Oxy-tantalum pthtalocyaninesをタンタル源としてマルチウォールカーボンナノチューブ上にTaCxNyOzを担持した触媒について回転リングディスク法を用いて改良Damianovic法により反応機構を解析した。本系では4電子反応によるH2O生成の反応速度の方が2電子反応によるH2O2生成よりも速かった。とくに調製時の酸化時間が短い触媒は酸素欠損が多いと考えられ、4電子反応がより優先して進行した。

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

oxy-tantalum phthalocyaninesをタンタル源として熱分解酸化によりTs2O5系のナノ粒子をマルチウォールカーボンナノチューブに担持することに成功した。（001）方向が歪んだorthorhombic構造のものが高活性であった。また、活性は酸化物の表面積並びにカーボンの部分伝導パスの状況に大きな影響を受けた。

Ti-Nb酸化物系触媒のPEFC用脱白金カソードへの適用

田村柚子, 石原顕光, 千坂光陽, 河野雄次, 松澤幸一, 光島重徳, 太田健一郎

燃料電池 15 ( 2 ) 79 - 86 2015年10月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：燃料電池開発情報センター共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：電気化学会共著

高耐久性の燃料電池用酸素還元触媒として、Ti4O7ロッド担体にTi4O7とタンタルニオブ酸化物の混晶の触媒を担持した材料を開発した。この材料は80℃のスタート/ストップ加速劣化試験でも安定であることを示した。

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

T. Hayashi, A. Ishihara, Y. Kohno, K. Matsuzawa, S. Mitsushima, K. Ota

Electrochemistry 83 ( 10 ) 807 - 809 2015年10月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

4，5族遷移金属酸化物系の酸素還元電極触媒の反応機構解析として、oxy-titanium tetra-pyrazino- porphyrazineを低酸素分圧化で参加した高活性の触媒について回転リングディスク電極で評価した。実測値をDamjanovicモデルを改良して解析した結果、本触媒は直接4電子反応の機構でH2O2の生成量が非常に少ないことが分かった。

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 … 全著者表示

ECS Trans. 69 ( 17 ) 3 - 12 2015年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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

A. Ishihara，Y. Tamura，M. Chisaka，Y. Ohgi，Y. Kohno，K. Matsuzawa，S. Mitsushima，K. Ota

Catalysts 5 ( 3 ) 1289 - 1303 2015年7月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

非貴金属、非カーボン系の酸素還元用電極触媒としてタンタルニオブ酸化物に注目している。高濃度ゾルゲル法でグラッシーカーボン上にプリカーサを担持した後、600～1050℃で空気中あるいは4％水素で還元焼成した。700-900℃で還元焼成した材料が高い酸素還元活性を示した。このとき、活性の高い触媒からは微量のTi(Ⅲ)が検出された。この還元状態のTiは酸素欠損に対応していると考えられ、酸素欠損付近のTi(Ⅲ) が酸素が吸着する活性点となると考えられる。

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年6月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Oxy-zirconium phthalocyaninesをジルコニウム源として熱分解参加によりZrO2系のナノ粒子をマルチウォールカーボンナノチューブに担持した触媒の安定性を向上するために、再熱処理の効果について検討した。1100℃以上ではジルコニウム炭窒化物が生成して活性が低下するため、1000℃での再熱処理が最も活性が高く、耐久性も優れていた。このときZrO2ナノ粒子を被覆しているカーボンのグラファイト化が進んでおり、電子伝導性、耐久性の両面で優れていると考えられる。

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

Naoki Uehara, Akimitsu Ishihara, Hideto Imai, Masashi Matsumoto, Masazumi Arao, Yoshiro Ohgi, Yuji … 全著者表示

ECS Trans. 64 ( 36 ) 23 - 31 2015年4月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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

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

Physical Chemistry Chemical Physics 17 ( 12 ) 7643 - 7647 2015年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

TaOPcをTa源としてマルチウォールカーボンナノチューブ上にTaOx系触媒を担持することに成功した。TaOxはマルチウォールカーボン上にカーボン薄膜に覆われた状態で担持できた。この触媒委は酸性電解質中での非貴金属酸化物系酸素還元触媒としては非常に高い活性を示した。

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

平岡史也、河野雄次、松澤幸一、光島重徳

Electrocatalysis 6 ( 1 ) 102 - 108 2015年1月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

固体高分子形燃料電池用電極触媒であるPt/Cの電位サイクル下での粒成長について実験的に評価するとともに、粒径による表面エネルギーを考慮した溶解/析出機構にもとづくシミュレーションを行い、粒成長の機構を定量的に評価した。

PEFC用非貴金属カーボンフリー酸化物系触媒の開発

濱崎真, 石原顕光, 荒尾正純, 松本匡史, 今井英人, 河野雄次, 松澤幸一, 光島重徳, 太田健一郎

燃料電池 14 ( 2 ) 65 - 73 2014年10月 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：燃料電池開発情報センター共著

4，5族遷移金属酸化物系の酸素還元用電極触媒として、TiO2とNb2O5、Ta2O5、あるいはZrO2をボールミルでメカニカルに複合酸化物としたあと、非常に低い酸素分圧雰囲気で焼成してTi4O7-TixMyOz触媒を得た。この材料はTi4 O7が電子伝導をTixMyOzが触媒活性を担うと考えられる。このなかで、Nb系材料が最も高い酸素還元反応のオンセットポテンシャルを示した。また、いずれの材料も電位サイクルに対して高い安定性を示した。

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 … 全著者表示

ECS Transactions 64 ( 3 ) 239 - 246 2014年8月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

ECS Transactions 64 ( 3 ) 247 - 252 2014年8月

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

ECS Transactions 64 ( 3 ) 231 - 238 2014年8月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年8月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

ECS Transactions 58 ( 47 ) 1 - 7 2014年4月

記述言語：英語掲載種別：研究論文（学術雑誌）共著

PEFC用Zr酸化物系酸素還元触媒の活性影響因子の検討

殷仕宏、石原顕光、荒尾正純、松本匡史、今井英人、河野雄次、松澤幸一、光島重徳、太田健一郎

燃料電池 13 ( 3 ) 93 - 102 2014年3月 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：燃料電池開発情報センター共著

化学的に安定活安価なジルコニアをベースとした酸素還元用電極触媒を開発している。オキシジルコニウムフタロシアニンを非常に低い酸素分圧で熱分解、酸化して非常に高い活性を示す材料を開発した。このなかで、酸化物の活性には表面の析出炭素量と酸化物の結晶性の影響が大きいことを明らかにした。

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年2月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年11月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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 … 全著者表示

ECS Trans. 58 ( 1 ) 1495–1500 2013年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年9月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

部分酸化したタンタル炭窒化物の酸素還元触媒の活性サイトが酸素欠損であり、表面に析出した遊離炭素が電子伝導を担っていることを明らかにした。

PEFC 用チタン酸化物系酸素還元触媒の高活性化の試み

水藤雄章、石原顕光、荒尾正純、松本匡史、今井英人、河野雄次、松澤幸一、光島重徳、太田健一郎

燃料電池 12 ( 4 ) 130 - 137 2013年4月 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：燃料電池開発情報センター共著

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年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

酸化タンタル系及び酸化ジルコニウム系酸素還元触媒を空気雰囲気中の硫酸に浸漬し、開路の固体高分子形燃料電池運転条件での劣化が小さいことを明らかにした。

Degradation of Pt/C Under Various Potential Cycling Patterns

F. Hiraoka, K. Matsuzawa, S. Mitsushima

Electrocatalysis 4 ( 1 ) 10 - 16 2013年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

電位サイクル下でのPt/Cの粒成長は上限電位が高く、下限電位が0.6V vs. RHE程度で最も激しく、これは白金の電気化学的溶出との相関性が高いことを明らかにした。

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 … 全著者表示

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 160 ( 2 ) F162 - F167 2013年2月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

部分酸化ZrCN系のZrO2系酸素還元触媒活性と結晶構造の関係を評価した結果、活性発現因子として酸素欠損が重要であることを明らかにした。

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 … 全著者表示

ECS Transactions 50 ( 2 ) 1823 - 1829 2012年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年8月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年6月 [査読有り]

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

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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年5月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Ma … 全著者表示

Electrochimica Acta 68 192 - 197 2012年4月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年11月 [査読有り]

タンタル酸化物をベースとした化合物の酸素還元触媒能（2）TaON 系薄膜触媒における触媒活性点と炭素の役割.

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://linkinghub.elsevier.com/retrieve/pii/S1872206710602975

石原顕光　菊池彰文　大城善郎　松澤幸一　光島重徳　太田健一郎　松本匡史　今井英人

J. Japan Inst. Metals 75 ( 10 ) 552 - 556 2011年10月 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://www.jim.or.jp/journal/j/

タンタル酸化物をベースとした化合物の酸素還元触媒能（1）反応性スパッタ法を用いた薄膜モデル触媒の成膜条件と酸素還元活性.

菊池彰文　石原顕光　大城善郎　松澤幸一　光島重徳　太田健一郎　松本匡史　今井英人

J. Japan Inst. Metals 75 ( 10 ) 545 - 551 2011年10月 [査読有り]

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

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年10月

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

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

その他リンク： http://asmedl.org/FuelCell

Ken-ichiro Ota, Yoshiro Ohgi, Kyung-Don Nam, Koichi Matsuzawa, Shigenori Mitsushima, and Akimitsu I … 全著者表示

Journal of Power Sources 196 ( 12 ) 5256 - 5263 2011年6月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://linkinghub.elsevier.com/retrieve/pii/S0378775310016241

Keisuke Ukita, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ich … 全著者表示

Electrochemistry 79 ( 5 ) 340 - 342 2011年5月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://edit.electrochem.jp/

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

Electrochemistry 79 ( 5 ) 419 - 423 2011年5月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://edit.electrochem.jp/

Daisuke Inoue, Shigenori Mitsushima, Koichi Matsuzawa, Seung-Yul Lee, Tomohiro Yasuda, Masayoshi Wa … 全著者表示

Electrochemistry 79 ( 5 ) 377 - 380 2011年5月 [査読有り]

回転リングディスク電極法によるPt/C 上の還元電流からの酸素還元電流の分離

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://edit.electrochem.jp/

光島重徳，藤田預詞雄，永原良樹，菅原生豊，松澤幸一，篠原和彦，太田健一郎

電気化学 79 ( 1 ) 24 2011年1月 [査読有り]

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

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://edit.electrochem.jp/

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

Electrocatalysis 2 ( 1 ) 60 - 68 2010年12月 [査読有り]

Hydrogen Energy System and Environment Impact Factor

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年12月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://edit.electrochem.jp/

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

Electrochimica Acta 55 ( 27 ) 8008 - 8012 2010年11月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://www.sciencedirect.com/science/journal/00134686

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

Electrochimica Acta 55 ( 27 ) 7581 - 7589 2010年11月 [査読有り]

Mass Transportation in Diethylmethylammonium Trifluoromethanesulfonate for Fuel Cell Applications

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://www.sciencedirect.com/science/journal/00134686

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

Electrochimica Acta 55 6639 - 6644 2010年9月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年6月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Journal of Power Sources 195 2182 - 2188 2010年4月 [査読有り]

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

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://www.sciencedirect.com/science/journal/03787753

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

Electrochimica Acta 55 1239 - 1244 2010年1月 [査読有り]

Partially Oxidized Niobium Carbonitride as Non-Platinum Cathode for PEFC

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年11月 [査読有り]

Tantalum Oxide-based Cathodes without Precious Metals for PEFC

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://www.ecsdl.org/ESL

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

ECS Transactions 25 ( 1 ) 175 - 180 2009年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

その他リンク： 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年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

その他リンク： 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, … 全著者表示

Journal of Power Sources 187 ( 2 ) 324 - 331 2009年2月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年1月 [査読有り]

Dissolution of platinum in acidic media

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Electrochimica Acta 54 ( 2 ) 455–460 2008年12月 [査読有り]

熱拡散白金ルテニウム合金触媒の組成比が耐一酸化炭素被毒特性へ与える影響

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://www.sciencedirect.com/science/journal/00134686

多田　智之，山本　夕美，光島　重徳，太田健一郎

電気化学 76 ( 11 ) 813 - 823 2008年11月 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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 … 全著者表示

ECS Transactions 16 ( 2 ) 449 2008年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

その他リンク： 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 … 全著者表示

ECS Transactions 16 ( 2 ) 1253 2008年10月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

その他リンク： 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年7月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： 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年6月 [査読有り]