Durability of a Segmented-in-Series Tubular SOFC with a (Ce, Sm)O 2 cathode interlayer: Influence of operating conditions

Yoshinori Kobayashi, Kazuo Tomida, Hiroshi Tsukuda, Yusuke Shiratori, Shunsuke Taniguchi, Kazunari Sasakid

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

The influence of operating temperature and fuel/air utilization on long-term chemical stability and cell performance degradation is comprehensively investigated and reported for a segmented-in-series tubular solid oxide fuel cell (SOFC), with a (La0.5Sr0.25Ca0.25)MnO 3 (LSCM) cathode and a (Ce0.8Sm0.2)O 2 (SDC) cathode interlayer, under development for large-scale power plants combined with SOFCs. During three kinds of durability tests for 5000 hours, the average degradation rates of the cell-stacks were around zero, well meeting a tolerant cell voltage degradation rate target of 0.25% per 1000 hours, corresponding to the 10% cell voltage degradation for 40,000 hours. The electrochemical performance was stable at high operating temperature, although the porosity of the SDC cathode-interlayer decreased due to Mn and Ca diffusion from the LSCM cathode. On the other hand, the cell voltage noticeably decreased at lower operating temperature, below 800°C. Detailed observation of the microstructure and elemental distribution after durability testing revealed that a dense layer formed between the LSCM cathode and the SDC interlayer at low temperature, consisting of La, Ca, and Mn. The degradation in cell performance is attributed to the formation of this dense layer, preventing oxygen supply to the electrode reaction sites.

本文言語英語
ページ(範囲)F214-F225
ジャーナルJournal of the Electrochemical Society
161
3
DOI
出版ステータス出版済み - 2014

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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