Improvement of solid oxide fuel cells based on reaction mechanism analysis in solid/gas phase interface

• Project/Area Number: 25810134
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Kyoto University
• Principal Investigator: ORIKASA Yuki 京都大学, 人間・環境学研究科(研究院), 助教 (20589733)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 電気化学 / 燃料電池 / ペロブスカイト型酸化物 / X線吸収分光法 / その場測定 / 固体イオニクス

Outline of Final Research Achievements

Reaction mechanism of solid oxide fuel cells is investigated by in situ X-ray absorption spectroscopy. La1-xSrxCoO3-d (LSC) is considered a potential anode material since it confers the virtue of mixed ionic and electronic conductivity. Oxygen chemical potential can be evaluated by Co K-edge XAS measurement. We have developed in-situ depth resolved X-ray absorption spectroscopy (DR-XAS) as a novel technique to better clarify the surface reaction mechanism. The chemical shift measured under various polarizations is equal to that under equivalent oxygen partial pressures. The result suggests that the rate determining step of the electrode reaction on LSC electrode is the surface reaction.

Research Products

• [Journal Article] Surface Strontium Segregation of Solid Oxide Fuel Cell Cathodes Proved by In Situ Depth-Resolved X-ray Absorption Spectroscopy (2014)
  • Author(s): Yuki Orikasa, Ethan J. Crumlin, Shinnosuke Sako, Koji Amezawa, Tomoya Uruga, Michael D. Biegalski, Hans M. Christen, Yoshiharu Uchimoto, Yang Shao-Horn
  • Journal Title: ECS Electrochem. Lett. Volume: 3 Issue: 4 Pages: F23-F26
  • DOI: 10.1149/2.006404eel
  • Peer Reviewed
• [Presentation] SOFC空気極(La, Sr)CoO3における固気界面構造解析 (2014)
  • Author(s): 春木達郎, 酒向慎之介, 折笠有基, 内本喜晴
  • Organizer: 第55回電池討論会
  • Place of Presentation: 京都国際会館
  • Year and Date: 2014-11-19 – 2014-11-21
• [Presentation] その場電気化学X線吸収法を用いた高温水蒸気電極の電極反応機構解明 (2014)
  • Author(s): 春木達郎, 酒向慎之介, 折笠有基, 内本喜晴
  • Organizer: 第38回電解技術討論会
  • Place of Presentation: 埼玉大学
  • Year and Date: 2014-11-13 – 2014-11-14
• [Presentation] In Operando Observation of (La, Sr)CoO3 Perovskite Oxide Solid/Gas Interface by X-ray Absorption Spectroscopy (2014)
  • Author(s): Tatsuro Haruki, Shinnosuke Sako, Toshiaki Ina, Kiyofumi Nitta, Yuki Orikasa, Yoshiharu Uchimoto
  • Organizer: 226th Meeting of The Electrochemical Society
  • Place of Presentation: カンクン、メキシコ
  • Year and Date: 2014-10-05 – 2014-10-09
• [Presentation] その場測定を用いた(La,Sr)CoO3ペロブスカイト酸化物の固気界面構造解析 (2014)
  • Author(s): 春木達郎、伊奈稔哲、新田清文、折笠有基、湊丈俊、内本喜晴
  • Organizer: 電気化学会第81回大会
  • Place of Presentation: 関西大学
• [Presentation] 高温水蒸気電解空気極における反応律速過程と電極表面構造 (2013)
  • Author(s): 酒向慎之介、折笠有基、湊 丈俊、内本喜晴
  • Organizer: 第37回電解技術討論会
  • Place of Presentation: I-siteなんば