Stability of water in perovskite oxides and proton conductivity

• Project/Area Number: 19686045
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Metal making engineering
• Research Institution: Kyoto University
• Principal Investigator: UDA Tetsuya Kyoto University, 大学院・工学研究科, 准教授 (80312651)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥26,390,000 (Direct Cost: ¥20,300,000、Indirect Cost: ¥6,090,000); Fiscal Year 2008: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000); Fiscal Year 2007: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
• Keywords: ペロブスカイト / 水和反応 / 脱水反応 / 熱力学 / 燃料電池

Research Abstract

BaをドープしたLaScO_3は加湿雰囲気ではH2_Oが溶解し、電離したプロトンが電気伝導に寄与する。しかし、300℃程度以上で脱水反応が起こり、燃料電池の電解質への応用は困難である。そこで、H2_Oとの親和性の大きいBaOの濃度が高いほど酸化物中のH2_Oが安定化すると考え、価数の1つ大きいZr(IV)をSc(III)サイトに同時にドープし、BaOの固溶量を大きくし、H2_Oの安定性向上に成功した。

Research Products

• [Journal Article] Solid solutions of perovskite in the LaO1.5-BaO-ScO1.5-ZrO2 system at 1600 ℃ (2008)
  • Author(s): K. Suehiro, T. Uda, S.Imashuku, Y. Nose, Y. Awakura
  • Journal Title: Journal of Solid State Chemistry Vol. 181 Pages: 2572-2579
  • Peer Reviewed
• [Journal Article] Solid solutions of perovskite in the La01.5-Ba0-Sc01.5-Zr02 system at 1600℃ (2008)
  • Author(s): K. Suehiro, T. Uda, S. Imashuku, Y. Nose, Y. Awakura
  • Journal Title: Journal of Solid State Chemistry 181 Pages: 2572-2579
  • Peer Reviewed
• [Presentation] LaO.6BaO.4ScO2.8-BaZrO3系固溶体の領域探索と水和・脱水特性 (2007)
  • Author(s): 末広浩一
  • Organizer: 平成19年度第3回材料化学研究会
  • Place of Presentation: 兵庫県立大学姫路書写キャンパス
  • Year and Date: 2007-12-10
• [Presentation] LaO.6BaO.4ScO2.8-BaZrO3系固体酸化物の固溶領域探索と水和・脱水特性 (2007)
  • Author(s): 末広浩一
  • Organizer: 資源・素材2007秋季大会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2007-09-25
• [Presentation] La0.6Ba0.4Sc02.8-BaZr03系固体酸化物の固溶領域探索と水和・脱水特性 (2007)
  • Author(s): 末広 浩一、今宿 晋、宇田 哲也、粟倉 泰弘
  • Organizer: 資源・素材2007秋季大会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2007-09-25
• [Presentation] Hydration and protonic conduction properties of solid solutions of cubic perovskite forming between LaO.6BaO.4ScO2.8 and BaZrO3 (Poster presentation) (2007)
  • Author(s): K. Suehiro
  • Organizer: International Society of Electrochemistry 58th Annual Meeting
  • Place of Presentation: Banff (Canada)
  • Year and Date: 2007-09-11
• [Presentation] Hydration and protonic conduction properties of solid solutions ofcubic perovskite forming between LaO.6BaO.4ScO2.8 and BaZrO3 (Poster presentation) (2007)
  • Author(s): K. Suehiro, S. Imashuku, T. Uda, Y. Awakura
  • Organizer: International Society of Electrochemistry 58th Annual Meeting
  • Place of Presentation: Banff (Canada)
  • Year and Date: 2007-09-11