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    Thermodynamic stability mapping and electrochemical study of La1-xSrxCo0.2Fe0.8O3±δ (x=0.2–0.4) as a cathode of solid oxide fuel cells in the presence of SO2

    Access Status
    Fulltext not available
    Authors
    Darvish, S.
    Wang, C.
    Jiang, San Ping
    Zhong, Y.
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Darvish, S. and Wang, C. and Jiang, S.P. and Zhong, Y. 2018. Thermodynamic stability mapping and electrochemical study of La1-xSrxCo0.2Fe0.8O3±δ (x=0.2–0.4) as a cathode of solid oxide fuel cells in the presence of SO2. Electrochimica Acta. 287: pp. 68-77.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2018.04.039
    ISSN
    0013-4686
    School
    Fuels and Energy Technology Institute
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102025
    http://purl.org/au-research/grants/arc/DP150102044
    URI
    http://hdl.handle.net/20.500.11937/73197
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Thermodynamic predictions and electrochemical analysis of secondary phase formation in SO2containing atmosphere on the surface of La1-xSrxCo0.2Fe0.8O3±d(x = 0.2–0.4) electrodes of solid oxide fuel cells have been carried out utilizing the CALculation of Phase Diagram (CALPHAD) approach. Impacts of temperature, SO2partial pressure, O2partial pressure as well as the cathode composition on the formation of secondary phases have been investigated and correlated with the previous investigations in the literature. The results predict that SrSO4, CoFe2O4, La2O2SO4, and La2(SO4)3has the possibility to form on the surface and at the cathode/electrolyte interface as a result of SO2existence in the system. It is also investigated that degradation occurs more severe for La0.6Sr0.4Co0.2Fe0.8O3±d(LSCF-6428) comparing to LSCF-7328 and LSCF-8228, due to the formation of a higher amount of secondary phases, specifically SrSO4. The results demonstrate the effectiveness of the computational thermodynamic modeling in the prediction of interaction and performance stability of SOFC cathodes in the presence of contaminants.

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