Durability of LSCF-coated Fe-Cr-Al alloy for SOFC applications

H. C. Pham, S. Taniguchi, Y. Inoue, J. Matsuda, J. T. Chou, K. Matsuoka, K. Sasaki

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1 Citation (Scopus)

Abstract

The long-term durability of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-coated Fe-Cr-Al alloy was investigated as a novel current collector material for SOFCs. The LSCF coating and subsequent heat-treatment at 700–900C changed the microstructure of the surface oxide layer to a columnar structure of nanosize γ-Al2O3 arranged in the same direction, in which a small amount of Sr3Al2O6 contributes to the electronic conduction. The LSCF coating decreased the alloy oxidation rate by 23% at 700C compared to the case without coating, following the parabolic growth law. Raising the temperature from 700C to 900C increased the oxidation rate of the LSCF-coated alloy by 51 times. The oxidation mechanism at 900C was considered to be similar to that at 700C, because of the similarity in microstructure, crystal structure, elemental composition and electrical conductivity. It was estimated that the Cr2O3 layer begins to grow on the inner side after roughly 6,000 h at 700C, when the thickness of the surface oxide layer exceeds 1 μm. The same γ-Al2O3 columnar microstructure still covered the surface after 12,000 h. However, further improvement in durability and electrical conductivity is needed to meet the requirements for practical application.

Original languageEnglish
Pages (from-to)F181-F188
JournalJournal of the Electrochemical Society
Volume165
Issue number3
DOIs
Publication statusPublished - Jan 1 2018

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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