Relationship between electrochemical properties of SOFC cathode and composition of oxide layer formed on metallic interconnects

K. Fujita, T. Hashimoto, K. Ogasawara, H. Kameda, Y. Matsuzaki, T. Sakurai

研究成果: ジャーナルへの寄稿会議記事査読

49 被引用数 (Scopus)

抄録

A Cr-poisoning of SOFC cathode was studied using half-cells with alloy separators of various Cr-content. The surfaces of the oxide layer formed on the alloys were observed using energy dispersion X-ray analysis, and the precipitation of Cr at the interface between YSZ electrolyte and the cathode was studied using electron probe micro analysis. All the Cr-containing alloys were found to promote cathode degradation. However, the time dependencies of overvoltage in half-cell tests were different from one another in three kinds of alloy materials. We found that the reason of the difference was in relation to the Cr2O3 and the MnCr2O4 in the oxide layer formed on the alloy surface. Tests of single-cell stacks were also performed with these alloy separators. The degradation of stack voltage was large for all the stacks, and that was consistent with the half-cell tests. The reason for the large degradation was found to be a formation of SrCrO 4, which was presumably synthesized by the reaction of Cr 2O3 in the oxide layer on the alloy and Sr diffused from the cathode. Therefore, it is necessary to develop a component in which the alloy does not contact the cathode directly.

本文言語英語
ページ(範囲)270-277
ページ数8
ジャーナルJournal of Power Sources
131
1-2
DOI
出版ステータス出版済み - 5月 14 2004
外部発表はい
イベントSelected Papers Presented at the Eigth Grove Fuel Cell Symposium - London, 英国
継続期間: 9月 24 20039月 26 2003

!!!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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