Papers - MATSUZAWA Koichi
about 78-
Zn添加率と熱処理雰囲気の制御によるPEFCカソード用TiO2ベース触媒のORR活性向上
小幡もも，松澤幸一，竹内悠，永井崇昭，門田隆二，石原顕光
燃料電池 24 ( 1 ) 58 - 65 2024.7 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：燃料電池開発情報センター Joint Work
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チタン酸化物ベース触媒への鉄、亜鉛添加による酸性電解質中における酸素還元活性の向上
小幡もも，松澤幸一，竹内悠，商磊，原賢二，石原晋次，伊澤和祥，永井崇昭，門田隆二，石原顕光
燃料電池 23 ( 3 ) 83 - 94 2024.1 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：燃料電池開発情報センター Joint Work
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Improvement of ORR Activity of Monoclinic Zirconium Oxides by Fe and F Co-addition for PEFC Cathodes
Yuu TAKEUCHI, Koichi MATSUZAWA, Yasuke MATSUOKA, Keita WATANABE, Takaaki NAGAI, Ryuji MONDEN, Akimi … Show more authors
Yuu TAKEUCHI, Koichi MATSUZAWA, Yasuke MATSUOKA, Keita WATANABE, Takaaki NAGAI, Ryuji MONDEN, Akimitsu ISHIHARA Hide authors
Electrochemistry 91 ( 12 ) 127001 2023.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Effects of Oxygen Defects in Zr Oxide-Based Thin Films on Oxygen Reduction Reaction in Acidic Media
Yuri Watanabe, Koichi Matsuzawa, Ryuji Monden, Takaaki Nagai and Akimitsu Ishihara
ECS Transactions 112 ( 4 ) 343 - 351 2023.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Oxygen Evolution Activity on Mo Added Zr Oxide Catalyst in Alkaline Solution
Koichi Matsuzawa, Atsushi Nozaka, Kazuya Hirose and Akimitsu Ishihara
ECS Transactions 111 ( 4 ) 39 - 45 2023.5 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Fe and Zn Addition Effects of Ti Oxide-Based Electrocatalyst on Catalytic Activity for Oxygen Reduction Reaction
Koichi Matsuzawa, Momo Obata, Yuu Takeuchi, Yoshiro Ohgi, Takaaki Nagai, Ryuji Monden and Akimitsu … Show more authors
Koichi Matsuzawa, Momo Obata, Yuu Takeuchi, Yoshiro Ohgi, Takaaki Nagai, Ryuji Monden and Akimitsu Ishihara Hide authors
ECS Transactions 111 ( 5 ) 29 - 34 2023.5 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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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
Yuu Takeuchi, Koichi Matsuzawa, Takaaki Nagai, Kaoru Ikegami, Yoshiyuki Kuroda, Ryuji Monden, Akimi … Show more authors
Yuu Takeuchi, Koichi Matsuzawa, Takaaki Nagai, Kaoru Ikegami, Yoshiyuki Kuroda, Ryuji Monden, Akimitsu Ishihara 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>
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原子層堆積法で成膜したTiO2薄膜の酸性溶液中での電気化学特性とそのPEFCカソードへの適応可能性
渡辺友理，松澤幸一，永井崇昭，池上芳，門田隆二，今西哲士，山本春也，石原顕光
燃料電池 23 ( 1 ) 69 - 78 2023.1 [Reviewed] [Invited]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Effect of Organic Ligands in Precursors on Oxygen Reduction Activity of Titanium-oxide Based Catalysts as Non-Platinum Cathodes for PEFCs
Yuu Takeuchi, Koichi Matsuzawa, Keita Watanabe, Takaaki Nagai, Ryuji Monden, Akimitsu Ishihara
22 ( 3 ) 80 - 84 2023.1 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Effect of Iron Doping on Oxygen Reduction Activity of Zirconium Oxides Containing Carbon and Nitrogen Using Pyrazine Carboxylic Acid As Platinum Alternative Cathodes for PEFC
Keita Watanabe, Koichi Matsuzawa, Yuu Takeuchi, Kaoru Ikegami, Yoshiro Ohgi, Takaaki Nagai, Ryuji M … Show more authors
Keita Watanabe, Koichi Matsuzawa, Yuu Takeuchi, Kaoru Ikegami, Yoshiro Ohgi, Takaaki Nagai, Ryuji Monden and Akimitsu Ishihara Hide authors
ECS Transactions 109 ( 9 ) 389 - 399 2022.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Oxygen Evolution Reaction on Non-Precious Metal Oxide-Based Electrocatalysts With and Without Low Potential Scan in Acidic Solution
Koichi Matsuzawa, Yuma Kohara, Soma Hirayama, Satoshi Yamada and Akimitsu Ishihara
ECS Transactions 109 ( 9 ) 451 - 461 2022.10 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Enhancement of Oxygen Reduction Activity of Fe-added Zirconium Oxide Electrocatalysts without Conductive Supports in Sulfuric Acid
Takeuchi Yuu, Watanabe Keita, Matsuzawa Koichi, Nagai Takaaki, Ikegami Kaoru, Monden Ryuji, Ishihar … Show more authors
Takeuchi Yuu, Watanabe Keita, Matsuzawa Koichi, Nagai Takaaki, Ikegami Kaoru, Monden Ryuji, Ishihara Akimitsu Hide authors
CHEMISTRY LETTERS 51 ( 9 ) 927 - 931 2022.9 [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-added zirconium oxide electrocatalyst was synthesized using pyrazine carboxylic acid for catalyzing oxygen reduction reactions (ORR) in acidic media. The optimization of the Fe-additive ratio led to the highest onset potential of 0.917 V for ORR at −10 mA g<sub>cat</sub><sup>−1</sup> compared to that of previous studies. The high ORR activity was due to the formation of high-quality active sites with Fe addition in monoclinic ZrO<sub>2</sub> and a suitable electron supply path created through carbon deposited using a pyrazine carboxylic acid complex.</p>
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Corrigendum: Effects of Foreign Elements Added Oxide-Based Electrocatalyst for Oxygen Reduction Reaction as Non-Precious Metel Cathodes [ECS Trans. 108 (7) 181-188 (2022)]
Koichi Matsuzawa, Momo Obata, Yuu Takeuchi, Yoshiro Ohgi, Kaoru Ikegami, Takaaki Nagai, Ryuji Monde … Show more authors
Koichi Matsuzawa, Momo Obata, Yuu Takeuchi, Yoshiro Ohgi, Kaoru Ikegami, Takaaki Nagai, Ryuji Monden and Akimitsu Ishihara Hide authors
ECS Transactions 108 ( 7 ) 189 - 193 2022.5
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work
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Effects of Foreign Elements Added Oxide-Based Electrocatalyst for Oxygen Reduction Reaction as Non-Precious Metel Cathodes
Koichi Matsuzawa, Momo Obata, Yuu Takeuchi, Yoshiro Ohgi, Kaoru Ikegami, Takaaki Nagai, Ryuji Monde … Show more authors
Koichi Matsuzawa, Momo Obata, Yuu Takeuchi, Yoshiro Ohgi, Kaoru Ikegami, Takaaki Nagai, Ryuji Monden and Akimitsu Ishihara Hide authors
ECS Transactions 108 ( 7 ) 181 - 188 2022.5
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society Joint Work
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PEFCカソード用酸化物担体としてのPドープSnO2の適用性評価
井上裕太, 永井崇昭, 大城善郎, 黒田義之, 松澤幸一, 石原顕光
燃料電池 22 ( 3 ) 79 - 88 2022.1 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：一般社団法人 燃料電池開発情報センター Joint Work
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The Impact of Mn addition on Ta Oxide-Based Electrocatalysts for Oxygen Evolution Reaction in Acid
Koichi Matsuzawa, Soma Hirayama, Yuma Kohara, Akimitsu Ishihara
ECS Transactions 104 ( 8 ) 431 - 436 2021.10 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Noble Metal-Added Titanate Nanosheets for PEFC Cathode
Yuu Takeuchi, Koichi Matsuzawa, Takaaki Nagai, Kaoru Ikegami, Yoshiyuki Kuroda, Ryuji Monden, Akimi … Show more authors
Yuu Takeuchi, Koichi Matsuzawa, Takaaki Nagai, Kaoru Ikegami, Yoshiyuki Kuroda, Ryuji Monden, Akimitsu Ishihara Hide authors
ECS Transactions 104 ( 8 ) 337 2021.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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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) Publisher：一般社団法人 燃料電池開発情報センター Joint Work
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Catalytic Activity of Zirconia on Zirconium for the Oxygen Evolution Reaction in Potassium Hydroxide
Koichi Matsuzawa, Akimitsu Ishihara, Ayaka Oishi, Shigenori Mitsushima, Ken-ichiro Ota
Materials Science and Engineering: B 267 115112-1 - 115112-6 2021.5 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher： Elsevier Joint Work
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Control of surface area and conductivity of niobium-added titanium oxides as durable supports for cathode of polymer electrolyte fuel cells
Yongbing Ma, Takaaki Nagai, Yuta Inoue, Kaoru Ikegami, Yoshiyuki Kuroda, Koichi Matsuzawa, Teko W. … Show more authors
Yongbing Ma, Takaaki Nagai, 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 2021.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work
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Effect of Semiconducting Properties of Oxide-Based Compounds on Oxygen Reduction Activity in Acidic Media
Akimitsu Ishihara, Junji Hirata, Takaaki Nagai, Yoshiyuki Kuroda, Koichi Matsuzawa, Akihito Imanish … Show more authors
Akimitsu Ishihara, Junji Hirata, Takaaki Nagai, Yoshiyuki Kuroda, Koichi Matsuzawa, Akihito Imanishi, Shigenori Mitsushima, Yoshio Takasu, Ken-ichiro Ota Hide authors
ECS Transactions 98 ( 9 ) 457 - 464 2020.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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P-Doped SnO2 Powder as a Support for PEFC Cathode
Yuta Inoue, Koichi Matsuzawa, Yongbing MA, Yoshiro Ohgi, Takaaki Nagai, Yoshiyuki Kuroda, Shunya Ya … Show more authors
Yuta Inoue, Koichi Matsuzawa, Yongbing MA, Yoshiro Ohgi, Takaaki Nagai, Yoshiyuki Kuroda, Shunya Yamamoto, Akimitsu Ishihara Hide authors
ECS Transactions 98 ( 9 ) 565 - 572 2020.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Factors Affecting ORR Activity of Nb-Added TiOx Catalyst Using Carbon Support for PEFC
Adachi Yoshinori; Nagai Takaaki; Kuroda Yoshiyuki; Ohgi Yoshiro; Matsuzawa Koichi; Mitsushima Shige … Show more authors
Adachi Yoshinori; Nagai Takaaki; Kuroda Yoshiyuki; Ohgi Yoshiro; Matsuzawa Koichi; Mitsushima Shigenori; Ota Ken-ichiro; Ishihara Akimitsu Hide authors
ECS Transactions 98 ( 5 ) 555 - 563 2020.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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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 (scientific journal) Joint Work
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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 … 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 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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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.
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Emergence of Oxygen Reduction Activity in Zirconium Oxide-Based Compounds in Acidic Media: Creation of Active Sites for the Oxygen Reduction Reaction
Akimitsu Ishihara, Takaaki Nagai, Keisuke Ukita, Masazumi Arao, Masashi Matsumoto, Liwei Yu, Takahi … Show more authors
Akimitsu Ishihara, Takaaki Nagai, Keisuke Ukita, Masazumi Arao, Masashi Matsumoto, Liwei Yu, Takahiro Nakamura, Oki Sekizawa, Yasumasa Takagi, Koichi Matsuzawa, Teko W. Napporn, Shigenori Mitsushima, Tomoya Uruga, Toshihiko Yokoyama, Yasuhiro Iwasawa, Hideto Imai, Ken-ichiro Ota Hide authors
The Journal of Physical Chemistry C 123 ( 30 ) 18150 - 18159 2019.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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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
Other Link： https://doi.org/10.1007/s1267
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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, Hideto Imai, Ken-ichiro Ota Hide authors
Electrochimica Acta 283 1779 - 1788 2018.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Oxygen Reduction Activity of TiO2 Single Crystals in Acidic Media
Kenichiro Ota, Junji Hirata,Takaaki Nagai,Masazumi Arao,Masashi Matsumoto,Yoshiyuki Kuroda,Koichi M … 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
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Zirconium Oxynitride-Catalyzed Oxygen Reduction Reaction at Polymer Electrolyte Fuel Cell Cathodes
Mitsuharu Chisaka, Akimitsu Ishihara, Hiroyuki Morioka, Takaaki Nagai, Shihong Yin, Yoshiro Ohgi, K … Show more authors
Mitsuharu Chisaka, Akimitsu Ishihara, Hiroyuki Morioka, Takaaki Nagai, Shihong Yin, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima,Ken-ichiro Ota Hide authors
ACS Omega 2 ( 2 ) 678 - 684 2017.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ACS Publications Joint Work
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Zirconium Oxide-Based Compounds as Non-Platinum Cathodes for Polymer Electrolyte Fuel Cells
Kenichiro Ota, Takaaki Nagai, Takashi Miyazaki, Masashi Matsumoto, Koichi Matsuzawa, Shigenori Mits … Show more authors
Kenichiro Ota, Takaaki Nagai, Takashi Miyazaki, Masashi Matsumoto, Koichi Matsuzawa, Shigenori Mitsushima, Hideto Imai,Akimitsu Ishihara Hide authors
ECS Transactions 77 ( 11 ) 1465 - 1472 2017
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC INC Joint Work
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Kinetic Study of Oxygen Reduction Reaction on Tantalum Oxide-based Electrocatalysts Produced from Oxy-tantalum Phthalocyanines in Acidic Media
Naoki Uehara, Akimitsu Ishihara, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koichi Matsuzawa, Shig … Show more authors
Naoki Uehara, Akimitsu Ishihara, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima and Ken-ichiro Ota Hide authors
Electrochimica Acta 182 789 - 794 2015.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Membrane Electrolysis of Toluene Hydrogenation with Water Decomposition for Energy Carrier Synthesis
Shigenori Mitsushima, Yasutomo Takakuwa, Kensaku Nagasawa, Yuki Sawaguchi, Yuji Kohno, Koichi Matsu … Show more authors
Shigenori Mitsushima, Yasutomo Takakuwa, Kensaku Nagasawa, Yuki Sawaguchi, Yuji Kohno, Koichi Matsuzawa, Zaenal Awaludin, Akihiro Kato and Yoshinori Nishiki Hide authors
Electrocatalysis 7 ( 2 ) 127 - 131 2015.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work
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Tantalum Oxide-based Electrocatalysts Made from Oxy-tantalum Phthalocyanines as Non-platinum Cathodes for Polymer Electrolyte Fuel Cells
Naoki Uehara, Akimitsu Ishihara, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koichi Matsuzawa, Shig … Show more authors
Naoki Uehara, Akimitsu Ishihara, Masashi Matsumoto, Hideto Imai, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima and Ken-ichiro Ota Hide authors
Electrochimica Acta 179 146 - 153 2015.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Kinetic Study of Oxygen Reduction Reaction in Acid Solution on Titanium Oxide-based Catalysts Prepared from Oxy-titanium Tetra-pyrazino-porphyrazine
Tomoaki Hayashi, Akimitsu Ishihara, Naoki Uehara, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushim … Show more authors
Tomoaki Hayashi, Akimitsu Ishihara, Naoki Uehara, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima and Ken Ichiro Ota Hide authors
Electrochemistry 83 ( 10 ) 807 - 809 2015.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC JAPAN Joint Work
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Durability of Titanium-niobium Oxides Mixed with Ti4O7 as Non-precious- and Carbon-free Cathodes for PEFCs in H2SO4 at 80oC
Makoto Hamazaki, Akimitsu Ishihara, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima and Ken Ichi … Show more authors
Makoto Hamazaki, Akimitsu Ishihara, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima and Ken Ichiro Ota Hide authors
Electrochemistry 83 ( 10 ) 817 - 819 2015.10 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells
Akimitsu Ishihara, Yuko Tamura, Mitsuharu Chisaka, Yoshiro Ohgi, Yuji Kohno, Koichi Matsuzawa, Shig … Show more authors
Akimitsu Ishihara, Yuko Tamura, Mitsuharu Chisaka, Yoshiro Ohgi, Yuji Kohno, Koichi Matsuzawa, Shigenori Mitsushima and Ken-ichiro Ota Hide authors
Catalysts 5 ( 3 ) 1289 - 1303 2015.7 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG Joint Work
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Effect of Reheating Treatment on Oxygen-Reduction Activity and Stability of Zirconium Oxide-Based Electrocatalysts Prepared from Oxy-Zirconium Phthalocyanine for Polymer Electrolyte Fuel Cells
Youhei Okada, Akimitsu Ishihara, Masashi Matsumoto, Masazumi Arao, Hideto Imai, Yuji Kohno, Kouichi … Show more authors
Youhei Okada, Akimitsu Ishihara, Masashi Matsumoto, Masazumi Arao, Hideto Imai, Yuji Kohno, Kouichi Matsushima, Shigenori Mitsushima and Ken-ichiro Ota Hide authors
Journal of The Electrochemical Society 162 ( 9 ) F959 - F964 2015.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC INC Joint Work
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Synthesis of Nano-TaOx Oxygen Reduction Reaction Catalysts on Multi-walled Carbon Nanotubes Connected via a Decomposition of Oxy-tantalum Phthalocyanine
Akimitsu Ishihara, Mitsuharu Chisaka, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima and Ken- … Show more authors
Akimitsu Ishihara, Mitsuharu Chisaka, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima and Ken-ichiro Ota Hide authors
Physical Chemistry Chemical Physics 17 ( 12 ) 7643 - 7647 2015.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY Joint Work
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A Simulation Study of Pt Particle Degradation During Potential Cycling Using a Dissolution/Deposition Model
Fumiya Hiraoka, Koichi Matsuzawa, Shigenori Mitsushima
Electrocatalysis 6 ( 1 ) 102 - 108 2014.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work
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Emergence of Oxygen Reduction Activity in Partially Oxidized Tantalum Carbonitrides: Roles of Deposited Carbon for Oxygen-Reduction-Reaction-Site Creation and Surface Electron Conduction
Ishihara Akimitsu, Tamura Motoko, Ohgi Yoshiro, Matsumoto Masashi, Matsuzawa Koichi, Mitsushima Shi … Show more authors
Ishihara Akimitsu, Tamura Motoko, Ohgi Yoshiro, Matsumoto Masashi, Matsuzawa Koichi, Mitsushima Shigenori, Imai Hideto, Ota Ken-ichiro Hide authors
The Journal of Physical Chemistry C 117 ( 37 ) 18837 - 18844 2013.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC Joint Work
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Degradation of Pt/C Under Various Potential Cycling Patterns
Fumiya Hiraoka, Koichi Matsuzawa, Shigenori Mitsushima
Electrocatalysis 4 ( 1 ) 10 - 16 2013.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Oxygen Evolution Reaction for Ta Compound Films Prepared by Reaction Sputtering with Resintering
K. Matsuzawa, K. Goto, K. Takahashi, Y. Kohno, K. Ota, and S. Mitsushima
ECS Transactions 53 ( 9 ) 3 - 9 2013.5 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work
In order to improve catalytic activity for oxygen evolution reaction, we have investigated effect of resintering under vacuum at high temperature on activities of tantalum compound film prepared by reactive sputtering. As a result, the tantalum compound film which was prepared with resintering process after sputtering during formation of film was larger surface area than that without resintering. The tantalum compound film with resintering after sputtering was also improved for specific catalytic activity than that without resintering for the oxygen evolution reaction.
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Immersed effects of Ta and Zr compounds on activity of oxygen reduction reaction in sulfuric acid
Matsuzawa Koichi, Nozawa Kazuhiro, Yamauchi Kyosuke, Ishihara Akimitsu, Mitsushima Shigenori, Ota K … Show more authors
Matsuzawa Koichi, Nozawa Kazuhiro, Yamauchi Kyosuke, Ishihara Akimitsu, Mitsushima Shigenori, Ota Ken-ichiro Hide authors
JOURNAL OF POWER SOURCES 226 16 - 19 2013.3 [Reviewed]
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Factors for Improvements of Catalytic Activity of Zirconium Oxide-Based Oxygen-Reduction Electrocatalysts
Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Ma … Show more authors
Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Matsumoto,Hideto Imai Hide authors
Journal of The Electrochemical Society 160 ( 2 ) F162 - 167 2012.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Oxygen Evolution Reaction of Zr Compounds as New Anode Materials
Koichi Matsuzawa, Chikako Igarashi, Ryo Koike,Masahiko Aihara, Shigenori Mitsushima, Ken-ichiro Ota
Transactions of the Materials Research Society of Japan 37 ( 3 ) 373 - 376 2012.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Solubilities of La and Ni on LaNiO3 in Li/K Carbonate Eutectic with La2O3
Matsuzawa Koichi, Zhai Shang, Ota Ken-ichiro, Mitsushima Shigenori
CHEMISTRY LETTERS 41 ( 8 ) 817 - 819 2012.8 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Oxygen reduction reaction on tantalum oxide-based catalysts prepared from TaC and TaN
Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Ma … Show more authors
Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Matsumoto, and Hideto Imai Hide authors
Electrochimica Acta 68 192 - 197 2012.3 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/journal/00134686
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Ta Compound Film as New Anode Material for Polymer Electrolyte Water Electrolysis
K. Yamauchi, K. Matsuzawa, K. Ota, S. Mitsushima
ECS Transactions 41 ( 17 ) 21 - 25 2012.1
Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Electrochemical Society Joint Work
In order to attempt Ta compounds as anode electrocatalyst for Polymer electrolyte water electrolysis, the catalytic activities of Ta
compound films for the oxygen evolution reaction (OER) was investigated. Ta compound films were prepared under several partial pressures of nitrogen and oxygen at several temperatures by reactive sputtering. Although Ta compound films had high overpotential for the OER, the catalytic activities of Ta compounds for the OER were changed by the change of preparation condition. -
Pt-Ir-SnO2/C Electrocatalysts for Ethanol Oxidation in Acidic Media
Lianhua Zhao, Shigenori Mitsushima, Akimitsu Ishihara, Koichi Matsuzawa, and Ken-ichiro Ota
Chinese Journal of Catalysis 32 ( 11-12 ) 1856 - 1863 2011.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：SCIENCE PRESS Joint Work
Other Link： http://linkinghub.elsevier.com/retrieve/pii/S1872206710602975
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Akimitsu Ishihara, Akifumi Kikuchi, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichir … Show more authors
Akimitsu Ishihara, Akifumi Kikuchi, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Ken-ichiro Ota, Masashi Matsumoto, and Hideto Imai Hide authors
J. Japan Inst. Metals 75 ( 10 ) 552 - 556 2011.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Metals Joint Work
Other Link： https://www.jstage.jst.go.jp/article/jinstmet/75/10/75_10_552/_article/-char/ja/
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Akifumi Kikuchi, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Masashi M … Show more authors
Akifumi Kikuchi, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, Masashi Matsumoto, and Hideto Imai Hide authors
J. Japan Inst. Metals 75 ( 10 ) 545 - 551 2011.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Institute of Metals Joint Work
Other Link： https://www.jstage.jst.go.jp/article/jinstmet/75/10/75_10_545/_article/-char/ja/
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Akimitsu Ishihara, Motoko Tamura, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota.
Journal of Fuel Cell Science and Technology 8 ( 3 ) 031005 2011.10
Language：English Publishing type：Research paper (other science council materials etc.) Publisher：ASME-AMER SOC MECHANICAL ENG Joint Work
Other Link： http://asmedl.org/FuelCell
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Investigation of oxygen evolution reaction on non-precious metal compound for water electrolysis
Koichi Matsuzawa, Kyosuke Yamauchi, Chikako Igarashi, Ryo Koike, Masahiko Aihara, Shigenori Mitsush … Show more authors
Koichi Matsuzawa, Kyosuke Yamauchi, Chikako Igarashi, Ryo Koike, Masahiko Aihara, Shigenori Mitsushima, Ken-ichiro Ota Hide authors
Journal of the Hydrogen Energy Systems Society of Japan 36 ( 2 ) 50 - 56 2011.7 [Reviewed]
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Hydrogen Energy Systems Society of Japan Joint Work
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Development of group 4 and 5 metal oxide-based cathodes for polymer electrolyte fuel cell
Ken-ichiro Ota, Yoshiro Ohgi, Kyung-Don Nam, Koichi Matsuzawa, Shigenori Mitsushima, and Akimitsu I … Show more authors
Ken-ichiro Ota, Yoshiro Ohgi, Kyung-Don Nam, Koichi Matsuzawa, Shigenori Mitsushima, and Akimitsu Ishihara Hide authors
Journal of Power Sources 196 ( 12 ) 5256 - 5263 2011.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://linkinghub.elsevier.com/retrieve/pii/S0378775310016241
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Quantitative Analysis of Electrooxidation Products on Platinum for Direct Ethanol Fuel Cell.
Koichi Matsuzawa, Tomoaki Takahashi, Akimitsu Ishihara, Shigenori Mitsushima, and Ken-ichiro Ota
Electrochemistry 79 ( 5 ) 419 - 423 2011.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC JAPAN Joint Work
Other Link： http://edit.electrochem.jp/
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Zirconium Oxide-Based Compounds as Non-Pt Cathode for Polymer Electrolyte Fuel Cell
Keisuke Ukita, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ich … Show more authors
Keisuke Ukita, Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota Hide authors
Electrochemistry 79 ( 5 ) 340 - 342 2011.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC JAPAN Joint Work
Other Link： http://edit.electrochem.jp/
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Daisuke Inoue, Shigenori Mitsushima, Koichi Matsuzawa, Seung-Yul Lee, Tomohiro Yasuda, Masayoshi Wa … Show more authors
Daisuke Inoue, Shigenori Mitsushima, Koichi Matsuzawa, Seung-Yul Lee, Tomohiro Yasuda, Masayoshi Watanabe, and Ken-ichiro Hide authors
Electrochemistry 79 ( 5 ) 377 - 380 2011.5 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC JAPAN Joint Work
Other Link： http://edit.electrochem.jp/
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Solubilities of NiO and LaNiO3 in Li/Na eutectic carbonate with rare-earth oxide
Koichi Matsuzawa, Yoji Akinaga, Shigenori Mitsushima, Ken-ichiro Ota
Journal of Power Sources 196 5007 - 5011 2011.3 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
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Shigenori MITSUSHIMA,Yoshio FUJITA,Yoshiki NAGAHARA,Seiho SUGAWARA,Koichi MATSUZAWA,Kazuhiko SHINOH … Show more authors
Shigenori MITSUSHIMA,Yoshio FUJITA,Yoshiki NAGAHARA,Seiho SUGAWARA,Koichi MATSUZAWA,Kazuhiko SHINOHARA,Ken-ichiro OTA Hide authors
Electrochemistry 79 ( 1 ) 24 - 29 2011.1 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/electrochemistry/79/1/79_1_24/_article
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Hydrogen Energy System and Environment Impact Factor
Ken-ichiro Ota, Akimitsu Ishihara, Koichi Matsuzawa, and Shigenori Mitsushima
Electrochemistry 78 ( 12 ) 970 - 975 2010.12 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC JAPAN Joint Work
Other Link： http://edit.electrochem.jp/
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Progress in non-precious metal oxide-based cathode for polymer electrolyte fuel cells
Akimitsu Ishihara, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota.
Electrochimica Acta 55 ( 27 ) 8008 - 8012 2010.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/journal/00134686
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Shape-Controlled Platinum Nanoparticles of Different Sizes and Their lectrochemical Properties
Koichi Matsuzawa, Tomoko Fukushima, Minoru Inaba
Electrocatalysis 1 ( 2-3 ) 169 - 177 2010.11 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER Joint Work
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Tantalum oxide-based compounds as new non-noble cathodes for polymer
A. Ishihara, Y. Ohgi, K. Matsuzawa, S. Mitsushima, K. Ota
Electrochimica Acta 55 ( 27 ) 7581 - 7589 2010.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/journal/00134686
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Mass Transportation in Diethylmethylammonium Trifluoromethanesulfonate for Fuel Cell Applications
S. Mitsushima, Y. Shinohara, K. Matsuzawa, K. Ota
Electrochimica Acta 55 ( 22 ) 6639 - 6644 2010.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/journal/00134686
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K-D. Nam, A. Ishihara, K. Matsuzawa, S. Mitsushima, K. Ota, M. Matsumoto, H. Imai
Electrochimica Acta 55 ( 24 ) 7290 - 7297 2010.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work
Other Link： http://www.sciencedirect.com/science/journal/00134686
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Zirconium Oxide - Based Compound as New Cathode Without Platinum Group Metals for PEFC
Ohgi, A. Ishihara, K. Matsuzawa, S. Mitsushima, K. Ota
Journal of the Electrochemical Society 157 B885 - B891 2010.6 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://www.ecsdl.org/JES
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Partially Oxidized Niobium Carbonitride as Non-Platinum Cathode for PEFC
Nam, Kyung Don; Ishihara, Akimitsu; Matsuzawa, Koichi; Mitsushima, Shigenori; Ota, Ken-ichiro.
Electrochemical and Solid-State Letters 12 ( 11 ) B158 - B2160 2009.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC INC Joint Work
Other Link： http://www.ecsdl.org/ESL
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Zirconium Oxide-based Cathode without Platinum Group Metals for PEFC
Yoshiro Ohgi, Akimitsu Ishihara, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota
ECS Transactions 25 ( 1 ) 129 - 139 2009.10 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
Other Link： http://www.ecsdl.org/ECST
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Tantalum Oxide-based Cathodes without Precious Metals for PEFC
Akimitsu Ishihara, Hideto Imai, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota
ECS Transactions 25 ( 1 ) 175 - 180 2009.10 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
Other Link： http://www.ecsdl.org/ECST
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Tantalum-based Compounds Prepared by Reactive Sputtering as a New Non-platinum Cathode for PEFC
A. Kikuchi, A. Ishihara, K. Matsuzawa, S. Mitsushima, K. Ota
Chemistry Letters 38 ( 12 ) 1184 - 1185 2009.1 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：CHEMICAL SOC JAPAN Joint Work
Other Link： https://www.jstage.jst.go.jp/article/cl/38/12/38_12_1184/_article
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Group 4 and 5 Oxide-based Compounds as New Cathodes without Platinum Group Metals for PEFC
Akimitsu Ishihara, Motoko Tamura, Youta Maekawa, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushi … Show more authors
Akimitsu Ishihara, Motoko Tamura, Youta Maekawa, Yoshiro Ohgi, Koichi Matsuzawa, Shigenori Mitsushima, and Ken-ichiro Ota Hide authors
ECS Transactions 16 ( 2 ) 449 2008.10 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
Other Link： http://www.ecsdl.org/ECST
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Effect of rare earth oxides for improvement of MCFC
Ken-ichiro Ota , Yoshiyuki Matsuda, Koichi Matsuzawa, Shigenori Mitsushima, Nobuyuki Kamiya
Journal of Power Sources 160 811 - 815 2006.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://www.sciencedirect.com/science/journal/03787753
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Effects of Rare Earth Additives in the Li/Na Eutectic Carbonate for Decreasing the Solubility of NiO
Koichi Matsuzawa, Gen Tatezawa, Yoshiyuki Matsuda, Shigenori Mitsushima, Nobuyuki Kamiya, Ken-ichir … Show more authors
Koichi Matsuzawa, Gen Tatezawa, Yoshiyuki Matsuda, Shigenori Mitsushima, Nobuyuki Kamiya, Ken-ichiro Ota Hide authors
Journal of the Electrochemical Society 152 ( 6 ) A1116 - A1120 2005.6 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://www.ecsdl.org/JES
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The effect of La oxide additive on the solubility of NiO in molten carbonates
Koichi Matsuzawa, Tatsuya Mizusaki, Shigenori Mitsushima, Nobuyuki Kamiya and Ken-ichiro Ota,
Journal of Power Sources 140 ( 2 ) 258 - 263 2005.1 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://www.sciencedirect.com/science/journal/03787753
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Status of Molten Carbonate Fuel Cell and Improvement of the Cathode Stability
S. Mitsushima, K. Matsuzawa, N. Kamiya, K. Ota
Electrochimica Acta 47 ( 22-23 ) 3819 - 3826 2002.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： http://www.sciencedirect.com/science/journal/00134686
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Stability of Materials for Molten Carbonate Fuel Cells
S. Mitsushima, K. Ota, K. Matsuzawa, Y. Nishimura, T. Yamafuku, N. Kamiya
Proc. of 6th International Symposium on Molten Salt Chemistry and Technology, Shanghai University Press, Shanghai, China 267 - 272 2001
Language：English Publishing type：Research paper (international conference proceedings) Joint Work