Papers - KURODA Yoshiyuki
about 96-
Nakajima, R; Wago, H; Taniguchi, T; Sasaki, Y; Nishiki, Y; Awaludin, Z; Nakai, T; Kato, A; Mitsushi … Show more authors
Nakajima, R; Wago, H; Taniguchi, T; Sasaki, Y; Nishiki, Y; Awaludin, Z; Nakai, T; Kato, A; Mitsushima, S; Kuroda, Y Hide authors
CHEMICAL COMMUNICATIONS 60 ( 18 ) 2536 - 2539 2024.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
Nakajima Ritsuki, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, Awaludin Zaenal, Nakai Takaaki … Show more authors
Nakajima Ritsuki, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, Awaludin Zaenal, Nakai Takaaki, Kato Akihiro, Mitsushima Shigenori, Kuroda Yoshiyuki Hide authors
CHEMSUSCHEM 16 ( 18 ) 2023.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Operando observation of bubble formation and mass transfer overpotential in alkaline water electrolysis
MISUMI Ryuta, KURODA Yoshiyuki, ARAKI Takuto, MITSUSHIMA
JAPANESE JOURNAL OF MULTIPHASE FLOW 39 ( 1 ) 18 - 25 2025.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：THE JAPANESE SOCIETY FOR MULTIPHASE FLOW Joint Work
-
Measurement Methods on Electrodes and Electrocatalysts for Water Electrolysis
MITSUSHIMA Shigenori, IOROI Tsutomu, KURODA Yoshiyuki, NAGASAWA Kensaku, UCHIYAMA Tomoki, ORIKASA Y … Show more authors
MITSUSHIMA Shigenori, IOROI Tsutomu, KURODA Yoshiyuki, NAGASAWA Kensaku, UCHIYAMA Tomoki, ORIKASA Yuki, INOUE Hiroshi, HIGUCHI Eiji, ANDO Kota, NAKAJIMA Takashi, MISUMI Ryuta, UCHIMOTO Yoshiharu Hide authors
Electrochemistry advpub ( 0 ) 2025
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Joint Work
<p>Toward decarbonized society with sustainable growth, the use of renewable energy as a primary power source is highly demanded. Water electrolysis is promising to produce hydrogen from renewable energy for energy storage and transportation. In developments of new technologies related to alkaline water electrolysis (AWE) and proton exchange membrane water electrolysis (PEMWE), common measurement techniques are required to compare experimental results fairly among different institutes. In this paper, we introduce common measurement techniques, such as electrochemical half cell and full cell for AWE and PEMWE, evaluation techniques for catalytic activities and durability of catalysts under steady and non-steady operation, advanced synchrotron radiation analysis of catalysts, <i>operando</i> XAFS analysis, and optical observation of gas bubbles in detail, that are recently developed in the project research commissioned by the New Energy and Industrial Technology Development Organization (NEDO).</p>
-
Kuroda Yoshiyuki, Mizukoshi Daiji, Yadav Vinay, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, … Show more authors
Kuroda Yoshiyuki, Mizukoshi Daiji, Yadav Vinay, Taniguchi Tatsuya, Sasaki Yuta, Nishiki Yoshinori, Awaludin Zaenal, Kato Akihiro, Mitsushima Shigenori Hide authors
Advanced Energy and Sustainability Research 5 ( 11 ) 2024.11
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.
-
Kuroda, Y; Mizukoshi, D; Yadav, V; Taniguchi, T; Sasaki, Y; Nishiki, Y; Awaludin, Z; Kato, A; Mitsu … Show more authors
Kuroda, Y; Mizukoshi, D; Yadav, V; Taniguchi, T; Sasaki, Y; Nishiki, Y; Awaludin, Z; Kato, A; Mitsushima, S Hide authors
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH 5 ( 11 ) 2024.11
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
Daisuke Kitajima, Ryuta Misumi, Yoshiyuki Kuroda, Shigenori Mitsushima
Electrochimica Acta 502 2024.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
-
Direct Toluene Electro-hydrogenation Using Anion Exchange Membrane Electrolyzer
Rio SHINOHARA, Kensaku NAGASAWA, Yoshiyuki KURODA, Kaoru IKEGAMI, Shigenori MITSUSHIMA
Electrochemistry 92 ( 9 ) 097003 - 097003 2024.8 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Single Work
<p>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<sup>−2</sup>. This technology is valuable as a first step in direct toluene electro-hydrogenation using AEM.</p>
-
Yuri Nara, Moe Tomita, Kensaku Nagasawa, Yoshiyuki Kuroda, Shigenori Mitsushima, Hiroyoshi Kawakami … Show more authors
Yuri Nara, Moe Tomita, Kensaku Nagasawa, Yoshiyuki Kuroda, Shigenori Mitsushima, Hiroyoshi Kawakami, Manabu Tanaka Hide authors
Advanced Engineering Materials 27 ( 5 ) 2024.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
-
Kitajima Daisuke, Misumi Ryuta, Kuroda Yoshiyuki, Mitsushima Shigenori
Electrochimica Acta Early Access 2024.7
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.
-
Wilton Fogaca, Hayata Ikeda, Ryuta Misumi, Yoshiyuki Kuroda, Shigenori Mitsushima
International Journal of Hydrogen Energy 61 1274 - 1281 2024.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
-
Fogaca Wilton, Ikeda Hayata, Misumi Ryuta, Kuroda Yoshiyuki, Mitsushima Shigenori
International Journal of Hydrogen Energy 61 1274 - 1281 2024.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd. Joint Work
The effects of vertical Lorentz forces generated by an external magnetic field applied perpendicular to the inherent electric field on the oxygen evolution reaction conducted on a Ni wire are investigated using cyclic voltammetry, impedance measurements, and particle image velocimetry (PIV). Both downward and upward Lorentz forces provide smaller overpotentials than that generated in their absence. Based on a dual -bubble layer model for reactant transfer, we find that the diffusion resistance of the hydroxide ions and increased ohmic resistance (after iR correction) induced by the layer of bubbles attached to the electrode surface are most effectively alleviated by the downward Lorentz force, while the charge -transfer resistance is retained. Furthermore, the generated bubbles have smaller average diameters. By using PIV measurements, we find that stronger shear stresses induced by the faster flow of the electrolyte in the vicinity of the working electrode facilitate the detachment of bubbles from the electrode surface.
-
Haleem, AA; Akutagawa, H; Nakayama, S; Bao, Y; Awaludin, Z; Nagasawa, K; Kuroda, Y; Nishiki, Y; Mit … Show more authors
Haleem, AA; Akutagawa, H; Nakayama, S; Bao, Y; Awaludin, Z; Nagasawa, K; Kuroda, Y; Nishiki, Y; Mitsushima, S Hide authors
JOURNAL OF POWER SOURCES 587 2023.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Tsukase Naruhisa, Araki Takuto, Haleem Ashraf Abdel, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima … Show more authors
Tsukase Naruhisa, Araki Takuto, Haleem Ashraf Abdel, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima Shigenori Hide authors
International Journal of Hydrogen Energy 49 701 - 712 2023.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd. Joint Work
In alkaline water electrolysis, reverse currents are reported to occur after rapid cell voltage change due to the electrodes oxidation state difference and such currents lead to electrodes degradation. The reverse current problems can be more severe in practical applications with larger electrode sizes and larger numbers of cells. In this study, reverse current with changes in the oxidation state of electrodes and potential distribution aftersudden shutdown were analyzed based on a multi-physical simulation considering an electronic and ionic conduction in practical-scale. The effects of stack height, number of cells, and ionic resistance through the manifold on the reverse current distribution were investigated. The numerical results reveal that, especially under the condition of low manifold resistance and higher stack height, the discharge current extremely concentrated near the bottom of the edge electrode. This information is important for future stack development because this current concentration can cause severe stack degradation. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
-
Haleem Ashraf Abdel, Akutagawa Hironobu, Nakayama Shinya, Bao Yun, Awaludin Zaenal, Nagasawa Kensak … Show more authors
Haleem Ashraf Abdel, Akutagawa Hironobu, Nakayama Shinya, Bao Yun, Awaludin Zaenal, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Mitsushima Shigenori Hide authors
Journal of Power Sources 587 2023.10
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
Alkaline water electrolyzers use porous diaphragms to separate the gases produced in the two compartments of the cell while enabling ionic conductivity between them. The porosity level of the membrane poses a trade-off between its capability to prevent gas crossover and its ability to facilitate ionic conductivity. The high porosity of the membrane enhances ionic conductivity, but it also increases the rate of undesirable gas crossover. This study introduces a unique diaphragm that exhibits gas permeation anisotropy or "selectivity," which inhibits gas permeation to a greater extent in one direction than the other. Interestingly, the membrane maintains high ionic conductivity, comparable to that of the commercial Zirfon Perl UTP500 membrane. The gas permeation anisotropy arises from the structural design of the membrane, in which one side is smoother and denser than the other. Gas purity measurements for the produced gas streams are conducted under different operation loads, confirming the gas permeation anisotropy of the membrane. The purity of the produced target gas can be improved simply by positioning the membrane in a certain orientation between the two electrodes. Additionally, the membrane demonstrated exceptional durability under industrial operating conditions, maintaining a consistently high level of performance for more than 900 h.
-
Naruhisa Tsukase, Takuto Araki, Ashraf Abdel Haleem, Kensaku Nagasawa, Yoshiyuki Kuroda, Shigenori … Show more authors
Naruhisa Tsukase, Takuto Araki, Ashraf Abdel Haleem, Kensaku Nagasawa, Yoshiyuki Kuroda, Shigenori Mitsushima Hide authors
International Journal of Hydrogen Energy 49 701 - 712 2023.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Effect of the cathode catalyst loading on mass transfer in toluene direct electrohydrogenation
Nagasawa Kensaku, Sugita Yuya, Atienza-Marquez Antonio, Kuroda Yoshiyuki, Mitsushima Shigenori
JOURNAL OF ELECTROANALYTICAL CHEMISTRY 938 2023.6 [Reviewed]
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
Ferreira Eduardo B. B., Gibaldi Marco, Okada Ryuki, Kuroda Yoshiyuki, Mitsushima Shigenori, Jerkiewicz Gregory Hide authors
LANGMUIR 39 ( 23 ) 8163 - 8175 2023.5 [Reviewed]
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
Ferreira B. Eduardo, Gibaldi Marco, Okada Ryuki, Kuroda Yoshiyuki, Mitsushima Shigenori, Jerkiewicz Gregory Hide authors
Langmuir 39 ( 23 ) 8163 - 8175 2023.5
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.
-
Effect of the cathode catalyst loading on mass transfer in toluene direct electrohydrogenation
Nagasawa Kensaku, Sugita Yuya, Atienza-Marquez Antonio, Kuroda Yoshiyuki, Mitsushima Shigenori
Journal of Electroanalytical Chemistry 938 2023.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Science SA Joint Work
Toluene (TL)-methylcyclohexane (MCH) organic hydride is one of the most promising carrier candidates for the large-scale transport and storage of hydrogen. TL Direct electrohydrogenation electrolyzers based on solid polymer electrolyte membrane technology exhibit significant advantages in terms of energy efficiency compared with the conventional TL hydrogenation method. Mass transfer in the catalyst layer is a crucial aspect of the performance of these electrochemical devices. In this study, experiments were conducted using catalyst-coated membranes with various thicknesses to control the catalyst loading (carbon-supported platinum/ ruthenium alloy) and investigate its influence on the mass transfer properties and electrolytic performance of a TL direct electrohydrogenation electrolyzers. The current efficiency was also evaluated for TL concentrations between 1% and 100% in the cathode reactant. The results indicated than an optimum thickness of the cathode catalyst layer corresponding to catalyst loadings of 1.4-1.6 mg cm-2 could maximize the current efficiency of the electrolyzer. The presence of hydrogen gas generated as a side reaction in the high-TL concentration range and high MCH concentrations in the low-TL concentration range are the main factors contributing to a decrease in current efficiency.
-
Hayata Ikeda, Ryuta Misumi, Yoshinori Nishiki, Yoshiyuki Kuroda, Shigenori Mitsushima
Electrochimica Acta 452 2023.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Ikeda Hayata, Misumi Ryuta, Nishiki Yoshinori, Kuroda Yoshiyuki, Mitsushima Shigenori
Electrochimica Acta 452 2023.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd. Joint Work
Alkaline water electrolysis (AWE) requires low current densities (2.0 A cm(-2), and the tertiary alcohol effect was stable over several hours. The decomposition product of TBA was not detected after electrolysis at 3.0 A cm(-2) for 10 h. We clarified that the addition of tertiary alcohols will improve the current density and productivity of the AWE system.
-
Takeuchi Yuu, Matsuzawa Koichi, Nagai Takaaki, Ikegami Kaoru, Kuroda Yoshiyuki, Monden Ryuji, Ishih … Show more authors
Takeuchi Yuu, Matsuzawa Koichi, Nagai Takaaki, Ikegami Kaoru, Kuroda Yoshiyuki, Monden Ryuji, Ishihara Akimitsu Hide authors
Bulletin of the Chemical Society of Japan 96 ( 2 ) 175 - 177 2023.2 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本化学会 Joint Work
<p>Fe, N-doped SrTiO<sub>3</sub> was successfully synthesized using pyrazine carboxylic acid-metal complexes as the starting materials and exhibited high onset potential of 0.8 V vs. RHE for the oxygen reduction reaction because of the formation of high-quality active sites by Fe and N doping, and electron conduction paths by carbon nanotubes.</p>
-
Oda Kazuaki, Kuroda Yoshiyuki, Mitsushima Shigenori
ELECTROCATALYSIS 14 ( 3 ) 499 - 510 2023.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
A dual bubble layer model for reactant transfer resistance in alkaline water electrolysis
Ikeda Hayata, Misumi Ryuta, Nishiki Yoshinori, Kuroda Yoshiyuki, Mitsushima Shigenori
ELECTROCHIMICA ACTA 430 2022.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Development of highly alkaline stable anion conductive polymers with fluorene backbone for water electrolysis
Nara Yuri, Tanaka Manabu, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima Shigenori, Kawakami Hiroyo … Show more authors
Nara Yuri, Tanaka Manabu, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima Shigenori, Kawakami Hiroyoshi Hide authors
POLYMERS FOR ADVANCED TECHNOLOGIES 33 ( 9 ) 2863 - 2871 2022.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
A dual bubble layer model for reactant transfer resistance in alkaline water electrolysis
Ikeda Hayata, Misumi Ryuta, Nishiki Yoshinori, Kuroda Yoshiyuki, Mitsushima Shigenori
Electrochimica Acta 430 2022.8
Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd. Joint Work
Alkaline water electrolysis (AWE) can only operate efficiently at a relatively low current density of up to 0.6 A cm(-2) because bubbles cover the electrode surface at high current densities. Generally, the upper limit of current density in an electrochemical reaction is determined by the mass transfer of the reactant. Here, we propose a dual bubble layer model for the reactant transfer resistance of the oxygen evolution reaction in AWE. Using simple cylindrical nickel electrodes of different diameters, we conducted electrochemical impedance spectroscopy and microscopic observations with a high-speed video camera. The relationship between the polarization curve of the oxygen evolution reaction in AWE and the mass transfer resistance of hydroxide ions was investigated. At current densities above 0.5 A cm(-2), the bubble layer completely covered the electrode surface. This bubble layer consisted of two layers: an inner one formed by numerous primary bubbles generated on the electrode, and an outer one formed by coalesced large bubbles. The outer layer induces an additional solution resistance, R-sb. Changes in R-sb under various conditions were successfully explained by the thickness and void fraction of the bubble layer, conductivity of the solution, and tortuosity through the gap between bubbles. The inner layer resists the diffusion of hydroxide ions, and the resistance to hydroxide ion transfer through it (Rd) was modeled using the Warburg impedance element with a finite-length diffusion boundary. The charge-transfer resistance at the electrode surface (R-ct) is roughly inversely proportional to the current density. This result indicates R-ct is less sensitive to bubble coverage and almost all electrode surfaces are active in electrochemical reaction. The results showed that Rd increases with current density as much as Rct when the current density exceeds 1.0 A cm(-2). Up to a high current density of 2.5 A cm(-2), the change in polarization curve (delta E/delta i) could be quantitatively explained by the sum of the bulk solution resistance, R-s0, additional solution resistance R-sb in the gaps between large bubbles, diffusion resistance Rd in the inner bubble layer, and charge-transfer resistance R-ct at the electrode surface.
-
Effects of operation and shutdown parameters and electrode materials on the reverse current phenomenon in alkaline water analyzers
Haleem Ashraf Abdel, Huyan Jinlei, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Kato Akih … Show more authors
Haleem Ashraf Abdel, Huyan Jinlei, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Kato Akihiro, Nakai Takaaki, Araki Takuto, Mitsushima Shigenori Hide authors
JOURNAL OF POWER SOURCES 535 2022.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
beta-FeOOH nanorod as a highly active and durable self-repairing anode catalyst for alkaline water electrolysis powered by renewable energy
Kuroda Yoshiyuki, Takatsu Shohei, Taniguchi Tatsuya, Sasaki Yuta, Nagashima Ikuo, Inomata Akihiko, … Show more authors
Kuroda Yoshiyuki, Takatsu Shohei, Taniguchi Tatsuya, Sasaki Yuta, Nagashima Ikuo, Inomata Akihiko, Nishiki Yoshinori, Zaenal Awaludin, Nakai Takaaki, Kato Akihiro, Mitsushima Shigenori Hide authors
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 2022.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Electrochemical Methods for Water Electrolysis Electrodes and Electrocatalysts
MITSUSHIMA Shigenori, IOROI Tsutomu, KURODA Yoshiyuki, NAGASAWA Kensaku, UCHIYAMA Tomoki, ORIKASA Y … Show more authors
MITSUSHIMA Shigenori, IOROI Tsutomu, KURODA Yoshiyuki, NAGASAWA Kensaku, UCHIYAMA Tomoki, ORIKASA Yuki, INOUE Hiroshi, HIGUCHI Eiji, ANDO Kota, NAKAJIMA Takashi, MISUMI Ryuta, UCHIMOTO Yoshiharu Hide authors
Denki Kagaku 90 ( 2 ) 136 - 158 2022.6
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society of Japan Joint Work
<p></p>
-
Degradation Analysis of Pt/Nb-Ti4O7 as PEFC Cathode Catalysts with Controlled Arc Plasma-deposited Platinum Content
MA Yongbing, KAJIMA hirokata, SHIMASAKI Yuta, NAGAI Takaaki, NAPPORN Teko W., WADA Hiroaki, KURODA … Show more authors
MA Yongbing, KAJIMA hirokata, SHIMASAKI Yuta, NAGAI Takaaki, NAPPORN Teko W., WADA Hiroaki, KURODA Kazuyuki, KURODA Yoshiyuki, ISHIHARA Akimitsu, MITSUSHIMA Shigenori Hide authors
ELECTROCHEMISTRY 90 ( 5 ) 057004 - 057004 2022.5 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Joint Work
For polymer electrolyte fuel cell cathodes, highly durable supports are required to prevent catalyst degradation in supports. In this study, as model Pt catalysts, 2–10 wt% Pt was deposited on Magnéli-phase niobium-doped macroporous Ti<sub>4</sub>O<sub>7</sub> (Nb–Ti<sub>4</sub>O<sub>7</sub>) mounted on glassy carbon rods using the coaxial arc plasma deposition method. The morphologies of 2, 5, and 10 wt% Pt catalysts showed the hemisphere fine particles, islands with ca. 1.4 nm diameter and ca. 2.4 nm thickness, and films with ca. 3.3 nm thickness, respectively. During start/stop accelerated durability tests (ADTs) of 5000 cycles following the Fuel Cell Commercialization Conference of Japan protocol, Pt was slightly agglomerated; consequently, the morphologies of the 2, 5, and 10 wt% Pt catalysts were island-like with 3.5 nm thickness, chain bead-like with 4 nm thickness, and film-like with 4 nm thickness, respectively. This slight agglomeration led to good durability during the ADTs. Herein, the oxygen reduction reaction (ORR) mass activity (MA) values at 0.9 V vs. reversible hydrogen electrode (RHE) of the 2, 5, and 10 wt% Pt catalysts were 79, 60, and 36 A g<sub>Pt</sub><sup>-1</sup> after 5000 cycles ADT, respectively, which had declining ratios after 5000 cycles were 32 %, 17 %, and 0 %, respectively. The island-like and film-like Pt/Nb–Ti<sub>4</sub>O<sub>7</sub> presented activity and durability comparable to a Pt/C catalyst, which was 42 A g<sub>Pt</sub><sup>-1</sup> (0.9 V vs. RHE) with a 12 % of declining ratio after the ADTs. The durability of the MA suggested that the different affinity caused by different crystal faces led to the slight agglomeration of 2, 5, and 10 wt%_Pt/Nb–Ti<sub>4</sub>O<sub>7</sub> catalysts. These catalysts showed electrochemical surface areas (ECSAs) of 36, 27, and 29 m<sup>2</sup> g<sup>−1</sup> after the ADTs, with declining ratios as low as 20 %, 6 %, and 0 %, respectively. All Pt/Nb–Ti<sub>4</sub>O<sub>7</sub> catalysts showed higher durability of the ECSAs than the Pt/C catalyst, which was 68 m<sup>2</sup> g<sup>−1</sup> with a 30 % declining ratio after the ADT. Different from common Pt nanoparticle catalysts, which agglomerate into large spherical Pt particles, the slight agglomeration was caused by the interconnection of the deposits and supplemented by a limited increase in the diameter or thickness. The island-like morphology of Pt with a limited thickness presented both high durability and activity among the Pt/Oxide catalysts.
-
Improvement of Time-zero Analysis Method in Activity Evaluation of Powder Electrocatalyst for Gas Evolution Reaction
Nagasawa Kensaku, Li Kunpeng, Takenaga Yu, Kuroda Yoshiyuki, Mitsushima Shigenori
ELECTROCHEMISTRY 90 ( 4 ) 047004 - 047004 2022.4 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Joint Work
<p>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 LaNiO<sub>3</sub> (LNO) were found to be within the reported range, and the data was consistent in catalytic loading range of 2.5–3.3 mg<sub>-LNO</sub> cm<sup>−2</sup>. Using the improved time-zero analysis, the kinetic activity of the gas evolution powder catalyst is possible to be evaluated with high accuracy.</p>
-
Haleem Ashraf Abdel, Huyan Jinlei, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Kato Akih … Show more authors
Haleem Ashraf Abdel, Huyan Jinlei, Nagasawa Kensaku, Kuroda Yoshiyuki, Nishiki Yoshinori, Kato Akihiro, Nakai Takaaki, Araki Takuto, Mitsushima Shigenori Hide authors
Journal of Power Sources 535 2022.4
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
One of the major challenges facing the coupling of alkaline water electrolyzers (AWE) and inherently intermittent renewable energy sources (RES) is the reverse current phenomenon that takes place after shutdown and adversely affects the service life of the electrocatalysts. Herein, this phenomenon was studied experimentally and theoretically. The study showed that the potential of the electrodes on either side of the bipolar plate (BP) changes according to the amount of the reverse charge flowing through the BP during shutdown. In addition, the potential of the electrodes of the middle BP changed relatively faster than that of the other BPs due to the increased reverse current of the middle BP. Moreover, effects of the operating parameters and electrode materials on the reverse current phenomenon are uncovered. The electrolyte circulation during shutdown as well as the high operating temperature increased the reverse current. However, the electrolysis current did not significantly affect the reverse current. Additionally, the origin of the reverse current is mainly the redox reactions of the electrodes during shutdown. Furthermore, the cathode that attached to a robust anode, on the same BP, is subject to more stressors. This study is useful for adapting the AWE to the dynamic operation.
-
Microscopic high-speed video observation of oxygen bubble generation behavior and effects of anode electrode shape on OER performance in alkaline water electrolysis
Hayata Ikeda, Ryuta Misumi, Yudai Kojima, AshrafAbdel Haleem, Yoshiyuki Kuroda, Shigenori Mitsushima
International journal of hydrogen energy 47 ( 21 ) 11116 - 11127 2022.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
-
Ikeda Hayata, Misumi Ryuta, Kojima Yudai, Haleem Ashraf Abdel, Kuroda Yoshiyuki, Mitsushima Shigeno … Show more authors
Ikeda Hayata, Misumi Ryuta, Kojima Yudai, Haleem Ashraf Abdel, Kuroda Yoshiyuki, Mitsushima Shigenori Hide authors
International Journal of Hydrogen Energy 47 ( 21 ) 11116 - 11127 2022.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Pergamon-Elsevier Science Ltd. Joint Work
An important difficulty associated with alkaline water electrolysis is the rise in anode overpotential attributable to bubble coverage of the electrode surface. For this study, a system with a high-speed video camera was developed, achieving in-situ observation of bubble generation on an electrode surface, monitoring an area of 1.02 mm(2) at 6000 frames per second. The relation between polarization curve (current density up to 3.0 A cm(-2)) and oxygen bubble generation behavior on nickel electrodes having cylindrical wires and rectangular wires of different sizes (100-300 mu m) was clarified. The generated bubbles slide upward, contacting the electrode surface and detaching at the top edge. Observations indicate that small electrodes have short bubble residence time and thin bubble covering layer on the electrode. As a result, the small electrode diameter contributes to smaller overpotential at high current density. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
-
Sample-efficient parameter exploration of the powder film drying process using experiment-based Bayesian optimization
Nagai Kohei, Osa Takayuki, Inoue Gen, Tsujiguchi Takuya, Araki Takuto, Kuroda Yoshiyuki, Tomizawa M … Show more authors
Nagai Kohei, Osa Takayuki, Inoue Gen, Tsujiguchi Takuya, Araki Takuto, Kuroda Yoshiyuki, Tomizawa Morio, Nagato Keisuke Hide authors
SCIENTIFIC REPORTS 12 ( 1 ) 1615 2022.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
A Novel Evaluation Method of Powder Electrocatalyst for Gas Evolution Reaction
Nagasawa Kensaku, Matsuura Issei, Kuroda Yoshiyuki, Mitsushima Shigenori
ELECTROCHEMISTRY 90 ( 1 ) 017012 - 017012 2022.1 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Joint Work
<p>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 <i>forced-flow method</i>, and the two methods, namely <i>time zero analysis</i> and <i>flow rate infinitization analysis</i>, were demonstrated by the extrapolation of the measurement data. As a result, the combination of <i>forced-flow method</i> and <i>time-zero analysis</i> is the best evaluation method for the determination of kinetic current at time zero as the equivalent of the no-generation gas condition.</p>
-
Heat and Mass Balance Analysis of 130-W Active-type Direct-methanol Fuel Cell
Andoh Shinsuke, Kawaji Jun, Suzuki Shuichi, Kuroda Yoshiyuki, Mitsushima Shigenori
ELECTROCHEMISTRY 90 ( 1 ) 017007 - 017007 2022.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Hydrogen-Bonding-Induced Layered Assembly of Cage Siloxanes Modified with Diisopropylsilanol Groups
Naoto Sato, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
Chemistry letters 50 ( 10 ) 1770 - 1772 2021.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
PEFC用CNT上に担持したNb添加TiOx触媒のORR活性影響因子の検討
足立吉徳, 永井崇昭 大城善郎, 黒田義之, 松澤幸一, 光島重徳, 石原顕光
燃料電池 21 ( 1 ) 80 - 86 2021.7 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
Hydrolysis of Methoxylated Nickel Hydroxide Leading to Single-Layer Ni(OH)(2) Nanosheets
Muramatsu Keisuke, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyuki
INORGANIC CHEMISTRY 60 ( 10 ) 7094 - 7100 2021.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Direct bottom-up synthesis of size-controlled monodispersed single-layer magnesium hydroxide nanosheets modified with tripodal ligands
Muramatsu Keisuke, Kamiusuki Yuya, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyu … Show more authors
Muramatsu Keisuke, Kamiusuki Yuya, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyuki Hide authors
DALTON TRANSACTIONS 50 ( 9 ) 3121 - 3126 2021.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
ABDEL HALEEM Ashraf, NAGASAWA Kensaku, KURODA Yoshiyuki, NISHIKI Yoshinori, ZAENAL Awaludin, MITSUS … Show more authors
ABDEL HALEEM Ashraf, NAGASAWA Kensaku, KURODA Yoshiyuki, NISHIKI Yoshinori, ZAENAL Awaludin, MITSUSHIMA Shigenori Hide authors
Electrochemistry 89 ( 2 ) 186 - 191 2021.3 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Joint Work
<p>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<sup>−2</sup>. 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 NiCoO<i><sub>x</sub></i>/Ni-mesh electrode was used as a case study. The electrode showed remarkable durability under continuous operation (<i>i</i> = 0.6 A cm<sup>−2</sup>) 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.</p>
Other Link： https://ci.nii.ac.jp/naid/130007995096
-
Yongbing Ma, Takaaki Naga, Yuta Inoue, Kaoru Ikegami, Yoshiyuki Kuroda, Koichi Matsuzawa, Teko W. N … Show more authors
Yongbing Ma, Takaaki Naga, Yuta Inoue, Kaoru Ikegami, Yoshiyuki Kuroda, Koichi Matsuzawa, Teko W. Napporn, Yan Liu, Shigenori Mitsushima, Akimitsu Ishihara Hide authors
Materials & Design 203 109623-1 - 109623-10 2021.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
-
Practical and Reliable Methanol Concentration Sensor for Direct Methanol Fuel Cells
ANDOH Shinsuke, FUJITA Akira, MIITSU Takeshi, KURODA Yoshiyuki, MITSUSHIMA Shigenori
Electrochemistry 1 - 6 2021.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Joint Work
<p>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<sup>−2</sup> at anode) with quick response. The sensor also has a high durability for 6500 h in the simulated DMFC operating temperature.</p>
Other Link： https://ci.nii.ac.jp/naid/130007988368
-
Synthesis of Cristobalite Containing Ordered Interstitial Mesopores using Crystallization of Silica Colloidal Crystals
Matsuno Takamichi, Nakaya Takamichi, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazu … Show more authors
Matsuno Takamichi, Nakaya Takamichi, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyuki Hide authors
CHEMISTRY-AN ASIAN JOURNAL 16 ( 3 ) 207 - 214 2021.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
Measurement of powdery oxygen evolution reaction catalyst under practical current density using pressure-bonded electrodes
Tsukada Yudai, Kuroda Yoshiyuki, Niiro Hideaki, Fujii Yuichi, Fujimoto Norikazu, Mitsushima Shigeno … Show more authors
Tsukada Yudai, Kuroda Yoshiyuki, Niiro Hideaki, Fujii Yuichi, Fujimoto Norikazu, Mitsushima Shigenori Hide authors
ELECTROCHIMICA ACTA 353 2020.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Effect of Added Elements into TiO2 on Oxygen Reduction Activity in Acid Media
Akimitsu Ishihara, Takaaki Nagai, Masashi Matsumoto, Masazumi Arao, Yoshiyuki Kuroda, Koichi Matsuz … Show more authors
Akimitsu Ishihara, Takaaki Nagai, Masashi Matsumoto, Masazumi Arao, Yoshiyuki Kuroda, Koichi Matsuzawa, Shigenori Mitsushima, Hideto Imai, Ken-ichiro Ota Hide authors
ECS Transactions 97 ( 7 ) 583 - 592 2020.6 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
-
Selective Covalent Modification of Layered Double Hydroxide Nanoparticles with Tripodal Ligands on Outer and Interlayer Surfaces
Keisuke Muramatsu, Shiori Hayashi, Yoshiyuki Kuroda, Yuya Oka, Hiroaki Wada, Atsushi Shimojima, and … Show more authors
Keisuke Muramatsu, Shiori Hayashi, Yoshiyuki Kuroda, Yuya Oka, Hiroaki Wada, Atsushi Shimojima, and Kazuyuki Kuroda Hide authors
Inorganic Chemistry 2020.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Ishihara Akimitsu, Arao Masazumi, Matsumoto Masashi, Tokai Tsubasa, Nagai Takaaki, Kuroda Yoshiyuki … Show more authors
Ishihara Akimitsu, Arao Masazumi, Matsumoto Masashi, Tokai Tsubasa, Nagai Takaaki, Kuroda Yoshiyuki, Matsuzawa Koichi, Imai Hideto, Mitsushima Shigenori, Ota Ken-ichiro Hide authors
International Journal of Hydrogen Energy 45 ( 8 ) 5438 - 5448 2020.2
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 ( 3 ) 301 - 308 2020.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Effect of Nitrogen Doping on Oxygen Reduction Activity of TiO2 in Acidic Media
Akimitsu Ishihara, Takaaki Nagai, Noriko Murase, Masazumi Arao, Yoshiyuki Kuroda, Koichi Matsuzawa, … Show more authors
Akimitsu Ishihara, Takaaki Nagai, Noriko Murase, Masazumi Arao, Yoshiyuki Kuroda, Koichi Matsuzawa, Shigenori Mitsushima, Kou Furukawag, Hideto Imai, Kunchan Leeh, Ken-ichiro Ota Hide authors
ECS Transactions 2019.10
Language：English Publishing type：Research paper (other science council materials etc.) Publisher：ECS -- The Electrochemical Society Joint Work
-
Titanium Oxide Nano-Particles as Supports of Cathode Catalysts for Polymer Electrolyte Fuel Cells
Yongbing Ma, Yunlv Cheng, Yuta Inoue, Takaaki Nagai, Yoshiyuki Kuroda, Koichi Matsuzawa, Shigenori … Show more authors
Yongbing Ma, Yunlv Cheng, Yuta Inoue, Takaaki Nagai, Yoshiyuki Kuroda, Koichi Matsuzawa, Shigenori Mitsushima, Yan Liu, Yuan Wang, Akimitsu Ishihara Hide authors
ECS Transactions 2019.10
Language：English Publishing type：Research paper (other science council materials etc.) Publisher：ECS -- The Electrochemical Society Joint Work
-
Yoshiyuki Kuroda, Takeshi Nishimoto, Shigenori Mitsushima
Electrochimica Acta Vol.323 ( 10 ) 2019.10 [Reviewed]
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, Masazumi Arao, Masashi Matsumoto, TsubasaTokai, Takaaki Nagai, Yoshiyuki Kuroda, … Show more authors
Akimitsu Ishihara, Masazumi Arao, Masashi Matsumoto, TsubasaTokai, Takaaki Nagai, Yoshiyuki Kuroda, Koichi Matsuzawa, Hideto Imai, Shigenori Mitsushima, Ken-ichiro Ota Hide authors
International Journal of Hydrogen Energy 2019.9 [Reviewed]
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
-
Formation of silicate nanoscrolls through solvothermal treatment of layered octosilicate intercalated with organoammonium ions
Asakura Yusuke, Sugihara Megumi, Hirohashi Takeru, Torimoto Aya, Matsumoto Takuya, Koike Masakazu, … Show more authors
Asakura Yusuke, Sugihara Megumi, Hirohashi Takeru, Torimoto Aya, Matsumoto Takuya, Koike Masakazu, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyuki Hide authors
NANOSCALE 11 ( 27 ) 12924 - 12931 2019.7
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
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
Yoshiyuki Kuroda, Hikaru Igarashi, Takaaki Nagai, Teko W. Napporn, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Akimitsu Ishihara Hide authors
Electrocatalysis Vol.10 ( 5 ) 459 - 465 2019.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SpringerLink Joint Work
Print ISSN；1868-2529
Other Link： https://doi.org/10.1007/s12678-019-00544-3
-
Synthesis and crystal structure of double-three ring (D3R)-type cage siloxanes modified with dimethylsilanol groups
Sato Naoto, Tochigi Kazuma, Kuroda Yoshiyuki, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyuki
DALTON TRANSACTIONS 48 ( 6 ) 1969 - 1975 2019.2
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
黒田 義之
電気化学 87 ( 0 ) 358 - 358 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 電気化学会 Single Work
Other Link： https://ci.nii.ac.jp/naid/130007759670
-
Preparation of Siloxane-based Microporous Crystal from Hydrogen Bonded Molecular Crystal of Cage Siloxane
Naoto Sato, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
Chem. Eur. J., in press 2018.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) 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 Matsuzawa, Teko Napp … Show more authors
Akimitsu Ishihara, Chumeng Wu, Takaaki Nagai, Koji Ohara, Kengo Nakada, Koichi Matsuzawa, Teko Napporn, Masazumi Arao, Yoshiyuki Kuroda, Satoshi Tominaka, Shigenori Mitsushima, Ken-ichiro Ota, Hide authors
Electrochim. Acta 283 1779 - 1788 2018.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Effect of Intercalated Amide Molecules on Interlayer Condensation of Layered Silicate RUB-15
Masakazu Koike, Yusuke Asakura, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
Clay Science 22 1 - 11 2018.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Clay Science Society of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/jcssjclayscience/22/1/22_220101/_article
-
Precise size control of layered double hydroxide nanoparticles through reconstruction using tripodal ligands
Dalton Trans 47 12884 - 12892 2018
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
IMPROVEMENT OF TOLUENE DIRECT ELECTRO-HYDROGENATION ELECTROLYZER FOR ENERGY CARRIER TECHNOLOGY
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
-
Oxygen Reduction Activity of TiO2 Single Crystals in Acidic Media
Kenichiro Ota,Junji Hirata,Takaaki Nagai,Masazumi Arao,Masashi Matsumoto,Yoshiyuki Kuroda,Koichi Ma … Show more authors
Kenichiro Ota,Junji Hirata,Takaaki Nagai,Masazumi Arao,Masashi Matsumoto,Yoshiyuki Kuroda,Koichi Matsuzawa,Hideto Imai,Shigenori Mitsushima,Akimitsu Ishihara Hide authors
ECS Transactions 86 ( 13 ) 549 - 558 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
-
Formation of Single-Digit Nanometer Scale Silica Nanoparticles by Evaporation-Induced Self-Assembly
Shigeru Sakamoto, Masashi Yoshikawa, Kota Ozawa, Yoshiyuki Kuroda, Atsushi Shimojima, Kazuyuki Kuro … Show more authors
Shigeru Sakamoto, Masashi Yoshikawa, Kota Ozawa, Yoshiyuki Kuroda, Atsushi Shimojima, Kazuyuki Kuroda Hide authors
Langmuir 34 ( 4 ) 1711 - 1717 2017.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The American Chemical Society Joint Work
Other Link： https://pubs.acs.org/doi/10.1021/acs.langmuir.7b04042
-
In-situ synthesis of magnesium hydroxides modified with tripodal ligands in an organic medium
Keisuke Muramatsu, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
Dalton Transactions 2017.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Nanospace-Mediated Self-Organization of Nanoparticles in Flexible Porous Polymer Templates
Yoshiyuki Kuroda, Itaru Muto, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda
Langmuir 33 ( 36 ) 9137 - 9143 2017.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work
Other Link： http://pubs.acs.org/doi/10.1021/acs.langmuir.7b02344
-
Topotactic conversion of layered silicate RUB-15 to silica sodalite through interlayer condensation in N-methylformamide
Koike Masakazu, Asakura Yusuke, Sugihara Megumi, Kuroda Yoshiyuki, Tsuzura Hidehiro, Wada Hiroaki, … Show more authors
Koike Masakazu, Asakura Yusuke, Sugihara Megumi, Kuroda Yoshiyuki, Tsuzura Hidehiro, Wada Hiroaki, Shimojima Atsushi, Kuroda Kazuyuki Hide authors
DALTON TRANSACTIONS 46 ( 31 ) 10232 - 10239 2017.8
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
-
Synthesis of a Single-Crystalline Macroporous Layered Silicate from Macroporous UTL-Type Zeolite and its Accelerated Intercalation
Yusuke Asakura, Naoki Kawaura, Yoshiyuki Kuroda, Masakazu Koike, Hiroaki Wada, Atsushi Shimojima, K … Show more authors
Yusuke Asakura, Naoki Kawaura, Yoshiyuki Kuroda, Masakazu Koike, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda Hide authors
Chemistry A European Journal 23 ( 46 ) 11022 - 11029 2017.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
Toptactic Conversion of Layered Silicate RUB-15 to Silica Sodalite through Interlayer Condensation in N-Methylformamide
Masakazu Koike, Yusuke Asakura, Megumi Sugihara, Yoshiyuki Kuroda, Hidehiro Tsuzura, Hiroaki Wada, … Show more authors
Masakazu Koike, Yusuke Asakura, Megumi Sugihara, Yoshiyuki Kuroda, Hidehiro Tsuzura, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda Hide authors
Dalton Transactions 2017.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Preparation of Mesoporous Basic Mixed Metal Oxides through Assembly of Monodispersed Mg-Al Layered Double Hydroxide Nanoparticles
Yuya Oka, Yoshiyuki Kuroda, Takamichi Matsuno, Keigo Kamata, Hiroaki Wada, Atsushi Shimojima, Kazuy … Show more authors
Yuya Oka, Yoshiyuki Kuroda, Takamichi Matsuno, Keigo Kamata, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda Hide authors
Chemistry A European Journal 23 ( 39 ) 9362 - 9368 2017.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
Thickness Control of 3-Dimensional Mesoporous Silica Ultrathin Films by Wet-Etching
Maho Kobayashi, Kyoka Susuki, Tomohiro Otani, Shinpei Enomoto, Haruo Otsuji, Yoshiyuki Kuroda, Hiro … Show more authors
Maho Kobayashi, Kyoka Susuki, Tomohiro Otani, Shinpei Enomoto, Haruo Otsuji, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Takayuki Homma, Kazuyuki Kuroda Hide authors
Nanoscale 9 ( 24 ) 8321 - 8329 2017.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Direct Observation of the Outermost Surfaces of Mesoporous Silica Thin Films by High Resolution Ultralow Voltage Scanning Electron Microscopy
Maho Kobayashi, Kyoka Susuki, Haruo Otsuji, Yusuke Sakuda, Shunsuke Asahina, Naoki Kikuchi, Toshiyu … Show more authors
Maho Kobayashi, Kyoka Susuki, Haruo Otsuji, Yusuke Sakuda, Shunsuke Asahina, Naoki Kikuchi, Toshiyuki Kanazawa, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda Hide authors
Langmuir 33 ( 9 ) 2148 - 2156 2017.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The American Chemical Society Joint Work
-
Direct Synthesis of Highly Designable Hybrid Metal Hydroxide Nanosheets by Using Tripodal Ligands as One-Size-Fits-All Modifiers
Yoshiyuki Kuroda, Tatsuyuki Koichi, Keisuke Muramatsu, Kazuya Yamaguchi, Noritaka Mizuno, Atsushi S … Show more authors
Yoshiyuki Kuroda, Tatsuyuki Koichi, Keisuke Muramatsu, Kazuya Yamaguchi, Noritaka Mizuno, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda Hide authors
Chemistry A European Journal 23 ( 21 ) 5023 - 5032 2017.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
A Mesoporous Superlattice Consisting of Alternately Stacking Interstitial Nanospace within Binary Silica Colloidal Crystals
Yoshiyuki Kuroda, Yosuke Shimbo, Yasuhiro Sakamoto, Hiroaki Wada, Kazuyuki Kuroda
Angewandte Chemie International Edition 55 ( 36 ) 10702 - 10706 2016.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
Rational Low-Temperature Synthesis of Ultrasmall Nanocrystalline Manganese Binary Oxide Catalysts under Controlled Metal Cation Hydration in Organic Media
Yumi Miyamoto, Yoshiyuki Kuroda, Tsubasa Uematsu, Hiroyuki Oshikawa, Naoya Shibata, Yuichi Ikuhara, … Show more authors
Yumi Miyamoto, Yoshiyuki Kuroda, Tsubasa Uematsu, Hiroyuki Oshikawa, Naoya Shibata, Yuichi Ikuhara, Kosuke Suzuki, Mitsuhiro Hibino, Kazuya Yamaguchi, Noritaka Mizuno Hide authors
ChemNanoMat 2 ( 4 ) 297 - 306 2016.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
A Single-Crystalline Mesoporous Quartz Superlattice
Takamichi Matsuno, Yoshiyuki Kuroda, Masaki Kitahara, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kur … Show more authors
Takamichi Matsuno, Yoshiyuki Kuroda, Masaki Kitahara, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda Hide authors
Angewandte Chemie International Edition 55 ( 20 ) 6008 - 6012 2016.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-VCH VERLAG GMBH Joint Work
-
Synthesis of ultrasmall Li-Mn spinel oxides exhibiting unusual ion exchange, electrochemical, and catalytic properties
Yumi Miyamoto, Yoshiyuki Kuroda, Tsubasa Uematsu, Hiroyuki Oshikawa, Naoya Shibata, Yuichi Ikuhara, … Show more authors
Yumi Miyamoto, Yoshiyuki Kuroda, Tsubasa Uematsu, Hiroyuki Oshikawa, Naoya Shibata, Yuichi Ikuhara, Kosuke Suzuki, Mitsuhiro Hibino, Kazuya Yamaguchi, Noritaka Mizuno Hide authors
Scientific Reports 5 ( 15011 ) 13 2015.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Publishing Group Joint Work
-
Relationship between Aggregated Structures and Dispersibility of Layered Double Hydroxide Nanoparticles ca. 10 nm in Size and Their Application to Ultrafast Removal of Aqueous Anionic Dye
Yoshiyuki Kuroda, Kazuya Yamaguchi, Kazuyuki Kuroda, Noritaka Mizuno
Bulletin of the Chemical Society of Japan 88 ( 12 ) 1765 - 1772 2015.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan Joint Work
-
Critical Effect of Nb-doping on the Formation of Mesostructured TiO2 Using Silica Colloidal Crystals: Highly Ordered Mesoporous Nb-Doped TiO2 with Single Crystalline Framework and Plate-like Nb-Doped TiO2 with Ordered Mesoscale Dimples
Masaki Kitahara, Yuta Shimasaki, Takamichi Matsuno, Yoshiyuki Kuroda, Atsushi Shimojima, Hiroaki Wa … Show more authors
Masaki Kitahara, Yuta Shimasaki, Takamichi Matsuno, Yoshiyuki Kuroda, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda Hide authors
Chemistry A European Journal 21 ( 37 ) 13073 - 13079 2015.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
Regular assembly of cage siloxanes by hydrogen bonding of dimethylsilaol groups
Naoto Sato, Yoshiyuki Kuroda, Takuya Abe, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
Chemical Communications 51 ( 55 ) 11034 - 11037 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Electron Microscopy Study of Binary Nanocolloidal Crystals with ico-AB13 Structure Made of Monodisperse Silica Nanoparticles
Yasuhiro Sakamoto, Yoshiyuki Kuroda, Susumu Toko, Takuji Ikeda, Toshiyuki Matsui, Kazuyuki Kuroda
The Journal of Physical Chemistry C 118 ( 27 ) 15004 - 15010 2014.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work
-
Tripodal Ligand-Stabilized Layered Double Hydroxide Nanoparticles with Highly Exchangeable CO32-
Yoshiyuki Kuroda, Yumi Miyamoto, Mitsuhiro Hibino, Kazuya Yamaguchi, Noritaka Mizuno
Chemistry of Materials 25 ( 11 ) 2291 - 2296 2013.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work
-
Heterogeneously Catalyzed Aerobic Cross-Dehydrogenative Coupling of Terminal Alkynes and Monohydrosilanes by Gold Supported on OMS-2
Kazuya Yamaguchi, Ye Wang, Takamichi Oishi, Yoshiyuki Kuroda, Noritaka Mizuno
Angewandte Chemie International Edition 52 ( 21 ) 5627 - 5630 2013.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
A discrete octahedrally shaped [Ag6]4+ cluster encapsulated within silicotungstate ligands
Yuji Kikukawa, Yoshiyuki Kuroda, Kosuke Suzuki, Mitsuhiro Hibino, Kazuya Yamaguchi, Noritaka Mizuno
Chemical Communications ( 49 ) 376 - 378 2012.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Selective Cleavage of Periodic Mesoscale Structures: Two-Dimensional Replication of Binary Colloidal Crystals into Dimpled Gold Nanoplates
Yoshiyuki Kuroda, Yasuhiro Sakamoto, Kazuyuki Kuroda
Journal of the American Chemical Society 134 ( 20 ) 8684 - 8692 2012.4 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work
-
Uniform combination of carboxylato-modified gold nanoparticles as versatile building blocks of morphologically controlled materials
Yoshiyuki Kuroda, Kohta Fukumoto, Kazuyuki Kuroda
Applied Clay Science ( 55 ) 10 - 17 2011.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
-
Formation of Hierarchically Porous Hollow Spheres Composed of Dehydroxylated Imogolite and Carbonaceous Materials
Yoshiyuki Kuroda, Kazuyuki Kuroda
Bulletin of the Chemical Society of Japan 84 ( 106 ) 49 - 51 2011.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan Joint Work
-
One-Step Exfoliation of Kaolinites and Their Transformation into Nanoscrolls
Yoshiyuki Kuroda, Kazuyuki Ito, Kenichi Itabashi, Kazuyuki Kuroda
Langmuir 27 ( 53 ) 2028 - 2035 2011.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work
-
Expansion of Intertubular Mesopores of Imogolite Nanotubes by Thermal Decomposition of an Imogolite-Poly(Sodium 4-Styrenesulfonate) Composite
Yoshiyuki Kuroda, Kazuyuki Kuroda
Chemistry Letters 40 ( 1 ) 46 - 48 2011.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan Joint Work
-
Morphosynthesis of Nanostructured Gold Crystals by Utilizing Interstices in Periodically Arranged Silica Nanoparticles as a Flexible Reaction Field
Yoshiyuki Kuroda, Kazuyuki Kuroda
Angewandte Chemie International Edition 49 ( 39 ) 6993 - 6997 2010.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Joint Work
-
Integrated structural control of cage-type mesoporous platinum possessing both tunable large mesopores and variable surface structures by block copolymer-assisted Pt deposition in a hard-template
Yoshiyuki Kuroda, Yusuke Yamauchi, Kazuyuki Kuroda
Chemical Communications 46 ( 11 ) 1827 - 1829 2010.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Facile patterning of assembled silica nanoparticles with a closely packed arrangement through guided growth
Yusuke Yamauchi, Junko Imasu, Yoshiyuki Kuroda, Kazuyuki Kuroda, Yoshio Sakka
Journal of Materials Chemistry 19 ( 14 ) 1964 - 1967 2009.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work
-
Layer-by-layer assembly of imogolite nanotubes and polyelectrolytes into core-shell particles and their conversion to hierarchically porous spheres
Yoshiyuki Kuroda, Kazuyuki Kuroda
Science and Technology of Advanced Materials 9 ( 2 ) 025018 2008.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：IOP publishing Joint Work
-
Fabrication of Hierarchically Ordered Porous Films Composed of Imogolite via Colloidal Templating
Yoshiyuki Kuroda, Mamoru Tamakoshi, Junnosuke Murakami, Kazuyuki Kuroda
Journal of the Ceramic Society of Japan 115 ( 1339 ) 233 - 236 2007.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：The Ceramic Society of Japan Joint Work