Degradation mechanism of SOFC cathodes under CrO3 and SO 2 impurity exposures

T. Horita, D. H. Cho, F. Wang, M. Nishi, T. Shimonosono, H. Kishimoto, K. Yamaji, M. E. Brito, H. Yokokawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

The effects of Cr-and S-impurities on the cathode performances were examined at the mixed ionic-electronic conducting La0.6Sr 0.4Co0.2Fe0.8O3 (LSCF) cathode. Under exposures to CrO3 and SO2, the cathode performance decreased drastically by forming SrCrO4 and SrSO4 at the LSCF grain surfaces and electrochemical active sites. The main degradation factors of LSCF cathode was the decrease of surface reaction rates by the impurities. The Sr-diffusion and depletion in the LSCF structures can affect the cathode performance degradation. Relatively large amounts of Sr were depleted in the LSCF grains under CrO3 exposures by forming a thick SrCrO 4 at the Pt-mesh/LSCF cathode interfaces, while small amounts of Sr-depletion in the LSCF grains under SO2 exposures.

Original languageEnglish
Title of host publicationFuel Cell Seminar 2012
Pages69-77
Number of pages9
Edition1
DOIs
Publication statusPublished - 2013 Oct 21
EventFuel Cell Seminar and Exposition 2012 - Uncasville, CT, United States
Duration: 2012 Nov 52012 Nov 8

Publication series

NameECS Transactions
Number1
Volume51
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherFuel Cell Seminar and Exposition 2012
CountryUnited States
CityUncasville, CT
Period12/11/512/11/8

ASJC Scopus subject areas

  • Engineering(all)

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    Horita, T., Cho, D. H., Wang, F., Nishi, M., Shimonosono, T., Kishimoto, H., Yamaji, K., Brito, M. E., & Yokokawa, H. (2013). Degradation mechanism of SOFC cathodes under CrO3 and SO 2 impurity exposures. In Fuel Cell Seminar 2012 (1 ed., pp. 69-77). (ECS Transactions; Vol. 51, No. 1). https://doi.org/10.1149/05101.0069ecst