Microstructure-property relations of solid oxide fuel cell cathodes and current collectors cathodic polarization and ohmic resistance

K. Sasaki, J. P. Wurth, R. Gschwend, M. Gödickemeier, L. J. Gauckler

研究成果: Contribution to journalArticle査読

171 被引用数 (Scopus)

抄録

Microstructure, cathodic polarization, and ohmic resistance on the cathode side of ZrO2-based solid oxide fuel cells have been studied for the intermediate temperature operation range between 700 and 900°C. Starting powder characteristics, powder calcination temperature, and sintering temperature strongly influence the final microstructure of cathodes. Electrochemical performance depends on these processing parameters as well as on the cathode thickness and the contact spacing of current collectors. A decrease in effective electrode area occurs both on the microscopic level with coarse and inhomogeneous cathode microstructure and on the macroscopic level with a wide contact spacing of the current collectors. The smaller effective electrode area causes inhomogeneous current density distribution and results consequently in higher ohmic losses originating from the electrolyte and higher cathodic polarization. These losses are evaluated using La0.35Sr0.15MnO3 cathodes with different microstructures and on the ZrO2-8 mole percent Y2O3 electrolyte. The influence of current path constrictions on the ohmic and nonohmic losses is demonstrated using Pt current collectors of different geometric spacings.

本文言語英語
ページ(範囲)530-543
ページ数14
ジャーナルJournal of the Electrochemical Society
143
2
DOI
出版ステータス出版済み - 2 1996
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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