Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells

Y. Matsuzaki, Y. Tachikawa, T. Somekawa, K. Sato, Y. Kawabata, M. Sugahara, H. Matsumoto, S. Taniguchi, K. Sasaki

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

4 引用 (Scopus)

抜粋

The electrochemical properties of the proton-conducting ceramic fuel cells (PCFCs) with BaZr0.1Ce0.7Y0.1X0.1O3-δ (BZCYX, X = Ga, Sc, In, Yb, or Gd) electrolytes have been investigated. BZCYX materials were found to have various partial conductivities of charge-carriers such as ion, hole, and electron. The electrochemical properties exhibited strong dependences on operation conditions. When ASR and external current density were fixed at 0.4 Ω cm2 and 0.25 A cm-2, respectively, the electrical efficiency, η(X), was found to have the following sequential order: η(Sc) > η(In) > η(Ga) > η(Yb) > η(Gd). On the other hand, when ASR was not fixed but the thickness of the electrolyte was fixed at 25 μm, large variations appeared in the leakage current of the cells with the BZCYX electrolytes. The sequential order of the electrical efficiency with the fixed thickness was different from that with the fixed ASR as described in the above inequality expression, and depends on the operating temperature. The ratios of the leakage current with X = Yb or Gd were higher than those with X = Ga, Sc, or In. These high ratios were found to cause the serious drop in the electrical efficiency at an external current density of 0.25 A cm-2. We have successfully found out the candidates for the X element in BZCYX, by which high-efficient power generation would be expected.

元の言語英語
ホスト出版物のタイトルECS Transactions
編集者T. Kawada, S. C. Singhal
出版者Electrochemical Society Inc.
ページ441-450
ページ数10
エディション1
ISBN(電子版)9781607685395
DOI
出版物ステータス出版済み - 5 30 2017
イベント15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, 米国
継続期間: 7 23 20177 28 2017

出版物シリーズ

名前ECS Transactions
番号1
78
ISSN(印刷物)1938-5862
ISSN(電子版)1938-6737

その他

その他15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
米国
Hollywood
期間7/23/177/28/17

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • これを引用

    Matsuzaki, Y., Tachikawa, Y., Somekawa, T., Sato, K., Kawabata, Y., Sugahara, M., Matsumoto, H., Taniguchi, S., & Sasaki, K. (2017). Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. : T. Kawada, & S. C. Singhal (版), ECS Transactions (1 版, pp. 441-450). (ECS Transactions; 巻数 78, 番号 1). Electrochemical Society Inc.. https://doi.org/10.1149/07801.0441ecst