Degradation mechanism with impurities and life time estimation for SOFCs

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

4 Citations (Scopus)

Abstract

The degradation of La0.6Sr0.4Co0.2Fe 0.8O3 (LSCF) cathode performance were investigated under relatively high pressures of impurities with Cr and S. AC impedance and DC currents were measured as a function of operation time. The cathode polarization rapidly increased when exposure to CrO3 and SO2 due to active sites vanishing with impurities. The distributions of Cr and S in the porous LSCF were different due to the chemical reactivity and electrochemical effects. A significant amount of SrCrO4 was deposited at the gas inlet of cathode surface region whereas small spots of SrSO4 were distributed inside the porous LSCF cathode. From the trends of polarization increase, the decrease trends and life time of cathodes were estimated for the availability of cathodes.

Original languageEnglish
Title of host publicationFuel Cell Seminar 2011
PublisherElectrochemical Society Inc.
Pages297-304
Number of pages8
Edition1
ISBN (Electronic)9781566779807
ISBN (Print)9781566779807
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2011 Fuel Cell Seminar and Exposition - Orlando, FL, United States
Duration: 2011 Oct 312011 Nov 3

Publication series

NameECS Transactions
Number1
Volume42
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other2011 Fuel Cell Seminar and Exposition
Country/TerritoryUnited States
CityOrlando, FL
Period11/10/3111/11/3

ASJC Scopus subject areas

  • General Engineering

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