Space-resolved active site analysis of non-Pt group oxygen reduction reaction catalysts

• Project/Area Number: 16K20940
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry; Analytical chemistry
• Research Institution: University of Tsukuba
• Principal Investigator: NIWA Hideharu 筑波大学, 数理物質系, 助教 (50704566)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 燃料電池 / 二次電池 / 軟X線分光 / 正極触媒 / 放射光 / 物性実験 / 非白金触媒

Outline of Final Research Achievements

Active sites of non-Pt group oxygen reduction reaction catalysts for polymer electrolyte fuel cell were studied by space-resolved X-ray spectroscopy. Scanning transmission x-ray microscopy of the non-Pt cathode catalysts with different particle sizes showed that the non-Pt cathod catalyst with a smaller particle size formed a fine three-phase boundary.
Cathode active materials for sodium-ion batteries, which have larger particle sizes were also studied. The effects of element substitution and redox reactions on electronic states of layered oxides and metal-hexacyanoferrates for sodium-ion battery cathodes were revealed by X-ray spectroscopy.

Research Products

• [Journal Article] Electronic states in oxidized NaxCoO2 as revealed by X-ray absorption spectroscopy coupled with ab initio calculation (2018)
  • Author(s): Hideharu Niwa; Kazuyuki Higashiyama; Kaoru Amaha; Wataru Kobayashi; Yutaka Moritomo
  • Journal Title: Journal of Power Sources Volume: 384 Pages: 156-159
  • DOI: 10.1016/j.jpowsour.2018.02.075
  • NAID: 120007133899
  • Peer Reviewed
• [Journal Article] Invariant nature of substituted element in metal-hexacyanoferrate (2017)
  • Author(s): Hideharu Niwa, Wataru Kobayashi, Takayuki Shibata, Hiroaki Nitani, and Yutaka Moritomo
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 13225-13225
  • DOI: 10.1038/s41598-017-13719-z
  • NAID: 120007134718
  • Peer Reviewed / Open Access
• [Journal Article] Strong loca lization of oxidized Co3+ state in cobalt-hexacyanoferrate (2017)
  • Author(s): Hideharu Niwa, Masamitsu Takachi, Jun Okamoto, Wen-Bin Wu, Yen-Yi Chu, Amol Singh, Di-Jing Huang, and Yutaka Moritomo
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 16579-16579
  • DOI: 10.1038/s41598-017-16808-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Local structures around the substituted elements in mixed layered oxides (2017)
  • Author(s): S. Akama, W. Kobayashi, K. Amaha, H. Niwa, H. Nitani, and Y. Moritomo
  • Journal Title: Sci. Rep. Volume: 7 Issue: 1
  • DOI: 10.1038/srep43791
  • NAID: 120007134995
  • Peer Reviewed / Open Access
• [Journal Article] Domain size of phase-separated NaxCoO2 as investigated by X-ray microdiffraction (2017)
  • Author(s): Hideharu Niwa, Takayuki Shibata, Yasuhiko Imai, Shigeru Kimura, Yutaka Moritomo
  • Journal Title: Batteries Volume: 3 Issue: 1 Pages: 5-5
  • DOI: 10.3390/batteries3010005
  • NAID: 120007134869
  • Peer Reviewed / Open Access
• [Journal Article] Local distortion around the guest ion in perovskite oxides (2017)
  • Author(s): S. Akama, W. Kobayashi, H. Niwa, T. Uchiyama, and Y. Moritomo
  • Journal Title: Appl. Phys. Exp. Volume: 10 Issue: 5 Pages: 051101-051101
  • DOI: 10.7567/apex.10.051101
  • NAID: 210000135832
  • Peer Reviewed
• [Presentation] 遷移金属置換したプルシャンブルー類似体のXAFS解析 (2018)
  • Author(s): 丹羽秀治, 小林航, 柴田恭幸, 仁谷浩明, 守友浩
  • Organizer: 第31回日本放射光学会年会・放射光科学合同シンポジウム
• [Presentation] ナトリウム電池正極用配位高分子錯体の局所構造解析 (2018)
  • Author(s): 丹羽秀治
  • Organizer: TIAかけはし「温度変化で発電するモバイル発電器」研究会、ミニシンポジウム「量子ビームを用いた熱電変換素子の解析技術」
  • Invited
• [Presentation] ナトリウム電池正極用プルシャンブルーの局所構造解析 (2018)
  • Author(s): 丹羽秀治
  • Organizer: 平成29年度COREラボ 研究成果報告会
  • Invited
• [Presentation] 遷移金属置換したプルシャンブルー類似体の不変的な局所構造 (2018)
  • Author(s): 丹羽秀治, 小林航, 柴田恭幸, 仁谷浩明, 守友浩
  • Organizer: 第65回応用物理学会春季学術講演会
• [Presentation] ナトリウムイオン電池正極プルシャンブルー類似体の局所電子状態観測 (2017)
  • Author(s): 丹羽秀治, 高地雅光, 岡本淳, Wen-Bin Wu，Di-Jing Huang，守友浩
  • Organizer: 第６４回応用物理学会春季学術講演会
  • Place of Presentation: パシフィコ横浜(神奈川県横浜市)
  • Year and Date: 2017-03-14
• [Presentation] 共鳴軟 X 線発光分光によるナトリウムイオン電池正極活物質の局所電子状態測定 (2017)
  • Author(s): 丹羽秀治，高地雅光，岡本淳，Wen-Bin Wu，Di-Jing Huang，守友浩
  • Organizer: 第30回日本放射光学会年会放射光科学合同シンポジウム
  • Place of Presentation: 神戸芸術センター(兵庫県神戸市)
  • Year and Date: 2017-01-07
• [Presentation] エネルギー材料のX線分光 (2017)
  • Author(s): 丹羽秀治
  • Organizer: 第一回プレ戦略研究会「次世代物質・デバイス戦略開発拠点」
  • Invited
• [Presentation] Local electronic states of Co-Fe Prussian blue analogues for Na-ion battery cathodes investigated by Co L-edge RIXS (2017)
  • Author(s): Hideharu Niwa, Masamitsu Takachi, Jun Okamoto, Wen-Bin Wu, Di-Jing Huang, Yutaka Moritomo
  • Organizer: 10th International Conference on Inelastic X-ray Scattering (IXS2017)
  • Int'l Joint Research
• [Presentation] 軟X線分光によるナトリウムイオン電池用層状酸化物の電子状態観察 (2016)
  • Author(s): 丹羽秀治、天羽薫、小林航、守友浩
  • Organizer: 第57回電池討論会
  • Place of Presentation: 幕張メッセ(千葉県千葉市)
  • Year and Date: 2016-11-29