Preparation of LaGaO3-based perovskite oxide film by a pulsed-laser ablation method and application as a solid oxide fuel cell electrolyte

Jingwang Yan, Hiroshige Matsumoto, Taner Akbay, Takashi Yamada, Tatsumi Ishihara

研究成果: ジャーナルへの寄稿学術誌査読

40 被引用数 (Scopus)

抄録

LaGaO3-based perovskite oxide films are deposited on a dense substrate consisting of NiO, Fe3O4, and Sm-doped CeO2 (SDC). After in situ reduction, NiO and Fe3O4 are reduced to form an alloy and during reduction, the substrate becomes porous, and therefore can be used as a porous electrode substrate in a solid oxide fuel cell (SOFC). Since the reaction between NiO and LaGaO3-based oxide is known, an interlayer of SDC is introduced between the LaGaO3 film and the substrate. The LaGaO3/SDC bilayer film exhibits electrical conductivity close to that of a bulk one. A single fuel cell using the LaGaO3/SDC bilayer film shows an open-circuit potential of 1.1 V, which is close to the theoretical value. A quite large power density of 0.6 W cm-2 is achieved at 773 K with a LaGaO3 film of 5 μm in thickness. The effects of LaGaO3 film thickness on power generation are further studied. Although the open-circuit potential increases, the maximum power density decreases with increasing thickness. On the other hand, the open-circuit potential becomes lower with thicknesess below 5 μm. This suggests that the reaction between NiO and the LaGaO3 film occurs with an excessively thin film. Therefore, the largest power density is obtained with a film thickness of 5 μm. The effects of interlayer compound are also examined. The application of La(Sr)Ga(Fe)O3 (LSGF) is also effective in obtaining high power density, but the maximum value is less than that achieved with a SDC interlayer. A two-cell stack is successfully demonstrated.

本文言語英語
ページ(範囲)714-719
ページ数6
ジャーナルJournal of Power Sources
157
2
DOI
出版ステータス出版済み - 7月 3 2006

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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