La-doped BaCoO3 as a cathode for intermediate temperature solid oxide fuel cells using a LaGaO3 base electrolyte

Tatsumi Ishihara, Satoko Fukui, Hiroyasu Nishiguchi, Yusaku Takita

研究成果: ジャーナルへの寄稿学術誌査読

66 被引用数 (Scopus)

抄録

Cathodic behavior of BaCoO3 doped with La was investigated in this study for an intermediate temperature solid oxide fuel cell (ITFC). Electrical conductivity of BaCoO3 increased monotonically with an increasing amount of La doped for the Ba site at 1073 K po(2) = 10-5 atm. Cathodic overpotential at 1073 K decreased with increasing La content and attained a minimum at X = 0.3-0.5 in Ba1-xLaxCoO3. Since the cathodic overpotential of Ba0.6La0.4CoO3 kept a small value at decreased temperature, Ba0.6La0.4CoO3 is the optimum composition for the cathode of an ITFC among BaCoO3-based oxides. When La0.8Sr0.2Ga0.8Mg0.15Co0.05 O3 was used for the electrolyte, the power density of the cell using Ba0.6La0.4CoO3 for the cathode at 1073 K attained a value of 550 mW/cm2, which is slightly higher than that using Sm0.5Sr0.5CoO3 for the cathode. In addition, a low cathodic overpotential of Ba0.6La0.4CoO3 was also maintained in air. 18O-16O exchange reaction was performed to estimate the surface activity for oxygen dissociation. It was found that BaCoO3 exhibits high activity for the oxygen exchange reaction. Therefore, superior cathode property was assigned to the high surface activity of BaCoO3.

本文言語英語
ジャーナルJournal of the Electrochemical Society
149
7
DOI
出版ステータス出版済み - 7月 1 2002
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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