Destruction modes of anode-supported SOFC caused by degrees of electrochemical oxidation in redox cycle

Toru Hatae, Yoshio Matsuzaki, Satoshi Yamashita, Yohtaro Yamazaki

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26 Citations (Scopus)

Abstract

The differences in the destruction mode of anode-supported solid oxide fuel cells (SOFCs) as a result of small and large amounts of oxidation were investigated. The cells were oxidized by O2- ions and rereduced by H2 gas (redox cycle). When 0.6% of Ni in the anode was oxidized, its microstructure near the electrolyte changed. Although this microstructural change in the anode by early redox cycles did not cause performance degradation, minor damage accumulated as the redox cycles increased. An increase in the microcracks in the anode led to partial delamination of the electrolyte, which finally resulted in a crack in the electrolyte. In contrast, when 31% of Ni in the anode was oxidized, a crack in the electrolyte was suddenly caused by two redox cycles. Because the electrolyte did not delaminate by a few redox cycles, the anode strain caused the electrolyte to crack, as reported by many researchers.

Original languageEnglish
Pages (from-to)B650-B654
JournalJournal of the Electrochemical Society
Volume157
Issue number5
DOIs
Publication statusPublished - 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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