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• Radiation-induced synthesis of carbon-supported niobium oxide nanoparticle catalysts and investigation of heat treatment conditions to improve the oxygen reduction reaction activity

  Shinyoshi Naoki, Seino Satoshi, Uetake Yuta, Nagai Takaaki, Monden Ryuji, Ishihara Akimitsu, Nakaga … 全著者表示

  Journal of the Ceramic Society of Japan   131 ( 9 )   575 - 580   2023年9月

  DOI Web of Science CiNii Research

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  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 日本セラミックス協会   共著  

  <p>Carbon-supported niobium oxide nanoparticle catalysts were synthesized for the oxygen reduction reaction (ORR) in acidic media. These catalysts were prepared using a ⁶⁰Co gamma-ray and heat-treated with polyacrylonitrile. Carbon black powder or multi-walled carbon nanotube (CNT) was used as the support for the niobium nanoparticle. Nb₂O₅ nanoparticles with low crystallinity were fine and well dispersed on the carbon support in the as-irradiated samples. The loading amount of niobium increased with the absorbed dose, which indicated that niobium nanoparticles were produced by the irradiation. The as-irradiated composite nanoparticles were heat-treated under an H₂ atmosphere (5 %) or a mixed atmosphere of H₂ (2 %) and O₂ (0.05 %) to introduce active sites. The ORR activities were significantly enhanced by the heat treatment. Furthermore, the ORR activities were improved by using multi-walled CNT as the support.</p>

• 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

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  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  

  <p>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.</p>

• 固体高分子形燃料電池用非白金カソード触媒としてのチタン系酸化物触媒の酸素還元活性に前駆体有機配位子が与える影響

  竹内　悠、松澤　幸一、渡辺　啓太、永井　崇昭、門田　隆二、石原　顕光

  燃料電池   22 ( 3 )   80 - 84   2023年1月  [査読有り]

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  記述言語：日本語   掲載種別：研究論文（学術雑誌）   単著  

• Improvement of ORR Activity of Monoclinic Zirconium Oxides by Fe and F Co-addition for PEFC Cathodes

  TAKEUCHI Yuu, MATSUZAWA Koichi, MATSUOKA Yasuke, WATANABE Keita, NAGAI Takaaki, MONDEN Ryuji, ISHIH … 全著者表示

  Electrochemistry   advpub ( 0 )   127001 - 127001   2023年

  DOI Web of Science CiNii Research

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  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  

  <p>We investigated the effect of adding Fe and F in the synthesis of zirconium-oxide-based cathode precursors to enhance the catalytic activity in the oxygen reduction reaction (ORR) in acidic media. In particular, we focused on adding F, and an ORR onset potential of 0.88 V was achieved by optimizing the amount of F added and heat treatment conditions contrary to a reversible hydrogen electrode. Additionally, a positive linear relationship was observed between the ORR onset potential and integrated intensity ratio of the monoclinic phase of ZrO₂ in the catalysts. This suggests that the monoclinic phase is fundamentally involved in the formation of active sites in the ORR in zirconium oxide-based cathodes.</p>

• 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

  K. Watanabe, K. Matsuzawa, Y. Takeuchi, K. Ikegami, Y. Ohgi, T. Nagai, R. Monden, and A. Ishihara

  ECS Transactions   109 ( 9 )   389 - 399   2022年10月  [査読有り]

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  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）   単著  

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• 啓蒙普及の事例ー東京タワー・キッズ環境科学博士

  永井崇昭, 和田徹也

  燃料電池   17 ( 3 )   42 - 45   2018年1月  [依頼有り]

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  記述言語：日本語   掲載種別：会議報告等   出版者・発行元：燃料電池開発情報センター   共著  

• 横浜国立大学グリーン水素研究センターの活動紹介と社会貢献

  太田健一郎, 石原顕光, 永井崇昭

  JETI   66 ( 1 )   121 - 125   2018年1月  [依頼有り]

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  記述言語：日本語   掲載種別：速報，短報，研究ノート等（大学，研究機関紀要）   出版者・発行元：株式会社日本出版制作センター   共著