Chemical expansion in SOFC materials: Ramifications, origins, and mitigation

S. R. Bishop, D. Marrocchelli, N. Perry, H. L. Tuller, G. Watson, B. Yildiz, K. Amezawa, J. Kilner

Research output: Contribution to journalArticle

Abstract

Non-stoichiometric oxides are frequently used in SOFC electrodes due to the ease with which they exchange oxygen with the atmosphere over their entire surface, as compared to composites limited to three phase boundaries (i.e. LSM/YSZ). The large fluctuations in oxygen content these materials exhibit during operation lead, not only to significant changes in transport properties, but also to a defect induced expansion, known as chemical expansion, potentially contributing to mechanical failure. In this presentation, new insights into the origins of chemical expansion, with consequent development of methods for reducing its impact in non-stoichiometric oxides, facilitated by collaborations of the authors, will be discussed.

Original languageEnglish (US)
Pages (from-to)643-648
Number of pages6
JournalECS Transactions
Volume57
Issue number1
DOIs
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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    Bishop, S. R., Marrocchelli, D., Perry, N., Tuller, H. L., Watson, G., Yildiz, B., Amezawa, K., & Kilner, J. (2013). Chemical expansion in SOFC materials: Ramifications, origins, and mitigation. ECS Transactions, 57(1), 643-648. https://doi.org/10.1149/05701.0643ecst