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    A comparative study of oxygen reduction reaction on Bi-and La-doped SrFeO3-d perovskite cathodes

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    Fulltext not available
    Authors
    Niu, Y.
    Sunarso, J.
    Liang, F.
    Zhou, W.
    Zhu, Z.
    Shao, Zongping
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Niu, Y. and Sunarso, J. and Liang, F. and Zhou, W. and Zhu, Z. and Shao, Z. 2011. A comparative study of oxygen reduction reaction on Bi-and La-doped SrFeO3-d perovskite cathodes. Journal of the Electrochemical Society. 158 (2): pp. B132-B138.
    Source Title
    Journal of the Electrochemical Society
    DOI
    10.1149/1.3521316
    ISSN
    0013-4651
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/4751
    Collection
    • Curtin Research Publications
    Abstract

    In this work the oxygen reduction reaction on Bi0.5 Sr 0.5 FeO3-d (BSF) and La0.5 Sr 0.5 Fe O3-d (LSF) as cathodes for intermediate temperature solid oxide fuel cells (600-750°C) is compared in detail. Partial substitution of Sr in SrFe O3-d with 50 mole % of Bi or La results in the distinct structural features which strongly impact its electrochemical characteristics due to the presence of a lone electron pair in Bi3+, which is not available in La3+. Cubic structure for BSF favours higher ionic conductivity and enhanced formation of oxygen vacancies relative to rhombohedral structure for LSF. Large oxygen nonstoichiometry for BSF, nevertheless, leads to the dominance of Fe3+ and subsequent low electronic conductivity relative to LSF. It was found that upon cathodic polarization, the oxygen vacancies are created on LSF which helps reducing its interfacial resistance afterward, which is not the case for BSF. Overall, BSF demonstrates good electrochemical performance which can be further optimized by enhancing its electronic conductivity. © 2010 The Electrochemical Society.

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