研究者詳細 - 黒田　義之

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.

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

Yuri Nara, Moe Tomita, Kensaku Nagasawa, Yoshiyuki Kuroda, Shigenori Mitsushima, Hiroyoshi Kawakami … 全著者表示

Advanced Engineering Materials 2024年8月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）単著

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

Kitajima Daisuke, Misumi Ryuta, Kuroda Yoshiyuki, Mitsushima Shigenori

Electrochimica Acta Early Access 2024年7月

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：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.

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

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

International Journal of Hydrogen Energy 61 1274 - 1281 2024年4月 [査読有り]

DOI Web of Science

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

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

International Journal of Hydrogen Energy 61 1274 - 1281 2024年3月

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

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.

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

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]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

Tsukase Naruhisa, Araki Takuto, Haleem Ashraf Abdel, Nagasawa Kensaku, Kuroda Yoshiyuki, Mitsushima … 全著者表示

International Journal of Hydrogen Energy 49 701 - 712 2023年12月

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

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.

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

Haleem Ashraf Abdel, Akutagawa Hironobu, Nakayama Shinya, Bao Yun, Awaludin Zaenal, Nagasawa Kensak … 全著者表示

Journal of Power Sources 587 2023年10月

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：Elsevier 共著

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.

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

Naruhisa Tsukase, Takuto Araki, Ashraf Abdel Haleem, Kensaku Nagasawa, Yoshiyuki Kuroda, Shigenori … 全著者表示

International Journal of Hydrogen Energy 49 701 - 712 2023年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

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]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年4月

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：Elsevier Science SA 共著

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.

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

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

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

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

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

Electrochimica Acta 452 2023年3月

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

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.

Fe, N-Doped SrTiO3 Synthesized Using Pyrazine Carboxylic Acid-Metal Complexes: Application as an Oxygen Reduction Catalyst for Polymer Electrolyte Fuel Cell Cathodes in Acidic Media

Takeuchi Yuu, Matsuzawa Koichi, Nagai Takaaki, Ikegami Kaoru, Kuroda Yoshiyuki, Monden Ryuji, Ishih … 全著者表示

Bulletin of the Chemical Society of Japan 96 ( 2 ) 175 - 177 2023年2月 [査読有り]

DOI Web of Science 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：公益社団法人日本化学会共著

Fe, N-doped SrTiO3 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.

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

Oda Kazuaki, Kuroda Yoshiyuki, Mitsushima Shigenori

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

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年10月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

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

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年8月

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

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 … 全著者表示

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

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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, … 全著者表示

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 2022年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

水電解用電極及び電極触媒に関する測定法

光島重徳, 五百蔵勉, 黒田義之, 長澤兼作, 内山智貴, 折笠有基, 井上博史, 樋口栄次, 安東航太, 中嶋隆, 三角隆太, 内本喜晴

電気化学 90 ( 2 ) 136 - 158 2022年6月

DOI CiNii Research

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：公益社団法人　電気化学会共著

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 … 全著者表示

ELECTROCHEMISTRY 90 ( 5 ) 057004 - 057004 2022年5月 [査読有り]

DOI Web of Science 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：公益社団法人　電気化学会共著

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 Ti4O7 (Nb–Ti4O7) 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 gPt-1 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–Ti4O7 presented activity and durability comparable to a Pt/C catalyst, which was 42 A gPt-1 (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–Ti4O7 catalysts. These catalysts showed electrochemical surface areas (ECSAs) of 36, 27, and 29 m2 g−1 after the ADTs, with declining ratios as low as 20 %, 6 %, and 0 %, respectively. All Pt/Nb–Ti4O7 catalysts showed higher durability of the ECSAs than the Pt/C catalyst, which was 68 m2 g−1 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年4月 [査読有り]

DOI Web of Science 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：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.

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 … 全著者表示

Journal of Power Sources 535 2022年4月

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：Elsevier 共著

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年3月 [査読有り]

DOI Web of Science

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

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

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

International Journal of Hydrogen Energy 47 ( 21 ) 11116 - 11127 2022年3月

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 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 … 全著者表示

SCIENTIFIC REPORTS 12 ( 1 ) 1615 2022年2月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年1月 [査読有り]

DOI Web of Science 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：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.

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年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年10月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年7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

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年5月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

DALTON TRANSACTIONS 50 ( 9 ) 3121 - 3126 2021年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

ABDEL HALEEM Ashraf, NAGASAWA Kensaku, KURODA Yoshiyuki, NISHIKI Yoshinori, ZAENAL Awaludin, MITSUS … 全著者表示

Electrochemistry 89 ( 2 ) 186 - 191 2021年3月 [査読有り]

DOI

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：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

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

Yongbing Ma, Takaaki Naga, Yuta Inoue, Kaoru Ikegami, Yoshiyuki Kuroda, Koichi Matsuzawa, Teko W. N … 全著者表示

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

DOI Web of Science

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

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年2月 [査読有り]

DOI

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

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 … 全著者表示

CHEMISTRY-AN ASIAN JOURNAL 16 ( 3 ) 207 - 214 2021年2月 [査読有り]

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

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

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

ECS Transactions 97 ( 7 ) 583 - 592 2020年6月 [査読有り]

DOI

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

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 … 全著者表示

Inorganic Chemistry 2020年3月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

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

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 ( 3 ) 301 - 308 2020年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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, … 全著者表示

ECS Transactions 2019年10月

DOI

記述言語：英語掲載種別：研究論文（その他学術会議資料等）出版者・発行元：ECS -- The Electrochemical Society 共著

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 … 全著者表示

ECS Transactions 2019年10月

DOI

記述言語：英語掲載種別：研究論文（その他学術会議資料等）出版者・発行元：ECS -- The Electrochemical Society 共著

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

Yoshiyuki Kuroda, Takeshi Nishimoto, Shigenori Mitsushima

Electrochimica Acta Vol.323 ( 10 ) 2019年10月 [査読有り]

DOI

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

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

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

International Journal of Hydrogen Energy 2019年9月 [査読有り]

DOI

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

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, … 全著者表示

NANOSCALE 11 ( 27 ) 12924 - 12931 2019年7月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

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]

DOI

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

Print ISSN；1868-2529

その他リンク： 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年2月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

無機合成化学から電気化学へ

黒田義之

電気化学 87 ( 0 ) 358 - 358 2019年

DOI

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：公益社団法人電気化学会単著

その他リンク： 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年9月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）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 Matsuzawa, Teko Napp … 全著者表示

Electrochim. Acta 283 1779 - 1788 2018年7月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Effect of Intercalated Amide Molecules on Interlayer Condensation of Layered Silicate RUB-15

小池正和, 朝倉裕介, 黒田義之, 和田宏明, 下嶋敦, 黒田一幸

Clay Science 22 1 - 11 2018年6月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：日本粘土学会共著

その他リンク： 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

Yoshiyuki Kuroda, Yuya Oka, Tadao Yasuda, Tatsuyuki Koichi, Keisuke Muramatsu, Hiroaki Wada, Atsush … 全著者表示

Dalton Trans 47 12884 - 12892 2018年

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年

DOI

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

Oxygen Reduction Activity of TiO2 Single Crystals in Acidic Media

Kenichiro Ota,Junji Hirata,Takaaki Nagai,Masazumi Arao,Masashi Matsumoto,Yoshiyuki Kuroda,Koichi Ma … 全著者表示

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

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Formation of Single-Digit Nanometer Scale Silica Nanoparticles by Evaporation-Induced Self-Assembly

阪本樹, 吉川昌, 小澤耕多, 黒田義之, 下嶋敦, 黒田一幸

Langmuir 34 ( 4 ) 1711 - 1717 2017年12月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：アメリカ化学会共著

その他リンク： https://pubs.acs.org/doi/10.1021/acs.langmuir.7b04042

In-situ synthesis of magnesium hydroxides modified with tripodal ligands in an organic medium

村松佳祐, 黒田義之, 和田宏明, 下嶋敦, 黒田一幸

Dalton Transactions 2017年11月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年8月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：アメリカ化学会共著

その他リンク： 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, … 全著者表示

DALTON TRANSACTIONS 46 ( 31 ) 10232 - 10239 2017年8月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Chemistry A European Journal 23 ( 46 ) 11022 - 11029 2017年5月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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, … 全著者表示

Dalton Transactions 2017年5月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Chemistry A European Journal 23 ( 39 ) 9362 - 9368 2017年5月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Nanoscale 9 ( 24 ) 8321 - 8329 2017年5月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

Langmuir 33 ( 9 ) 2148 - 2156 2017年2月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：アメリカ化学会共著

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 … 全著者表示

Chemistry A European Journal 23 ( 21 ) 5023 - 5032 2017年2月 [査読有り]

DOI Web of Science PubMed

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 共著

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年8月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

粒径の異なるシリカナノ粒子を自己組織化させ、サイズや形状の異なる粒子間空間が超格子構造を有する新規ナノ空間物質の形成を初めて報告した。ナノ空間に金属ナノ粒子等を導入することで、超格子デバイスの鋳型等に利用できると期待される。

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, … 全著者表示

ChemNanoMat 2 ( 4 ) 297 - 306 2016年4月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

有機溶媒中でテンプレートとなるカチオンの水和を制御することで、シングルナノメートルのMn系複酸化物を結晶相を制御しつつ合成する手法を報告した。生成物は酸化触媒や二次電池として高い性能を示した。表紙に採択。

A Single-Crystalline Mesoporous Quartz Superlattice

Takamichi Matsuno, Yoshiyuki Kuroda, Masaki Kitahara, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kur … 全著者表示

Angewandte Chemie International Edition 55 ( 20 ) 6008 - 6012 2016年4月 [査読有り]

DOI Web of Science PubMed

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 VERLAG GMBH 共著

シリカナノ粒子が規則的に配列したコロイド結晶を、ナノ構造を保ったまま単結晶クオーツに転換し、メソポーラス超格子の形成を初めて報告した。この様な材料は圧電性により空間を制御するユニークな材料として期待される。

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, … 全著者表示

Scientific Reports 5 ( 15011 ) 13 2015年10月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

有機溶媒中で反応させることで、結晶子径2.3 nmのスピネル型Li–Mn複酸化物ナノ粒子を低温で合成できることを報告した。生成物はLiイオン交換能、二次電池挙動、酸化触媒にユニークな物性を示した。

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年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

アニオン交換体である層状複水酸化物をナノ粒子状に制御し、さらにその凝集構造を制御することで、水に高分散させることに成功した。これを用いて色素の吸着除去を行ったところ、分散性の低い層状複水酸化物に比して2–3桁の速度向上が達成された。

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 … 全著者表示

Chemistry A European Journal 21 ( 37 ) 13073 - 13079 2015年7月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

シリカナノ粒子が規則的に配列したコロイド結晶を鋳型とし、単結晶性のNbドープTiO2ナノ構造体を合成し、Nbのドープ量が生成物の結晶相やナノ構造を変化させることを明らかにした。

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年6月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

かご型構造のケイ酸8量体分子が規則的に配列した結晶を温和な条件で合成した初めての報告である。ケイ酸8量体の末端にシラノール基を形成させることにより、水素結合を駆動力とした規則構造形成に成功した。

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年6月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

サイズの異なるシリカ粒子から得られるAB13型コロイド結晶にはico-AB13とcub-AB13の2つの多形が想定される。TEM像のフーリエ変換から、消滅則を判定することで、簡便かつ正確に構造の同定が可能であることを示した。

Tripodal Ligand-Stabilized Layered Double Hydroxide Nanoparticles with Highly Exchangeable CO₃^2-

Yoshiyuki Kuroda, Yumi Miyamoto, Mitsuhiro Hibino, Kazuya Yamaguchi, Noritaka Mizuno

Chemistry of Materials 25 ( 11 ) 2291 - 2296 2013年5月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

三脚型配位子が層状複水酸化物（LDH）の表面水酸基に選択的な結合を形成することを見出した。これを利用し、極めて小さなLDHナノ粒子の合成法を報告した。LDHナノ粒子は大気下でも二酸化炭素による妨害を殆ど受けず、有害アニオンの吸着除去に利用できることを示した。

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年4月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

金ナノ粒子をトンネル構造の二酸化マンガン（OMS-2）に担持した触媒を用い、空気を酸化剤としたアルキンとヒドロシランの脱水素クロスカップリング反応を報告した。OMS-2を用いることで空気を酸化剤としたプロセスが実現できた。SYNFACTSにて紹介。

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

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年4月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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

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年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

One-Step Exfoliation of Kaolinites and Their Transformation into Nanoscrolls

Yoshiyuki Kuroda, Kazuyuki Ito, Kenichi Itabashi, Kazuyuki Kuroda

Langmuir 27 ( 53 ) 2028 - 2035 2011年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年8月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年7月 [査読有り]