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    Boron poisoning of (La, Sr)(Co, Fe)O3 cathodes of solid oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Chen, K.
    Hyodo, J.
    Zhao, L.
    Ai, N.
    Ishihara, T.
    Jiang, San Ping
    Date
    2013
    Type
    Journal Article
    
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    Citation
    Chen, K. and Hyodo, J. and Zhao, L. and Ai, N. and Ishihara, T. and Jiang, S.P. 2013. Boron poisoning of (La, Sr)(Co, Fe)O3 cathodes of solid oxide fuel cells. ECS Transactions. 57 (1): pp. 1821-1830.
    Source Title
    ECS Transactions
    DOI
    10.1149/05701.1821ecst
    ISSN
    1938-5862
    School
    Fuels and Energy Technology Institute
    URI
    http://hdl.handle.net/20.500.11937/34309
    Collection
    • Curtin Research Publications
    Abstract

    Effect of volatile boron species on the properties of La 0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode materials has been studied in detail by using porous electrode coatings and dense bar samples. Prior to the characterization, the LSCF samples were heat-treated at 800°C in air in the presence of borosilicate glass for 7 and 30 days. Heat-treatment in the presence of glass has a significant detrimental effect on the surface exchange rate, electrical properties, and electrochemical activity of the cathodes. Secondary ion mass spectroscopy (SIMS) detected the deposition of boron as well as sodium and potassium on the surface and in the bulk of the bar samples. The boron deposition results in significant microstructure and composition changes. Sr in the form of SrB2O 4 is enriched on the outmost surface of LSCF bar samples, leading to the Srdeficient in the adjacent layer in the bulk. The present study demonstrates the remarkable detrimental effect of volatile boron species on the microstructure and electrochemical activity degradation of the LSCF cathode materials of solid oxide fuel cells. ©The Electrochemical Society.

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