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    Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-sNb0.1Co0.9O3-dperovskite cathodes

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    Authors
    Zhu, Y.
    Lin, Y.
    Shen, X.
    Sunarso, J.
    Zhou, W.
    Jiang, S.
    Su, D.
    Chen, F.
    Shao, Zongping
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhu, Y. and Lin, Y. and Shen, X. and Sunarso, J. and Zhou, W. and Jiang, S. and Su, D. et al. 2014. Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1-sNb0.1Co0.9O3-dperovskite cathodes. RSC Advances. 4 (77): pp. 40865-40872.
    Source Title
    RSC Advances
    DOI
    10.1039/c4ra06191h
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/27773
    Collection
    • Curtin Research Publications
    Abstract

    The creation of A-site cation defects within a perovskite oxide can substantially alter the structure and properties of its stoichiometric analogue. In this work, we demonstrate that by vacating 2 and 5% of A-site cations from SrNb0.1Co0.9O3−δ (SNC1.00) perovskites (Sr1−sNb0.1Co0.9O3−δ, s = 0.02 and 0.05; denoted as SNC0.98 and SNC0.95, respectively), a Jahn–Teller (JT) distortion with varying extents takes place, leading to the formation of a modified crystal lattice within a the perovskite framework. Electrical conductivity, electrochemical performance, chemical compatibility and microstructure of Sr1−sNb0.1Co0.9O3−δ as cathodes for solid oxide fuel cells were evaluated. Among SNC1.00, SNC0.98 and SNC0.95, SNC0.95 (P4/mmm symmetry (#123)) which exhibits a large JT distortion in conjunction with charge-ordering of cobalt (Co) shows the best oxygen reduction reaction (ORR) activity at low temperature while SNC0.98 (P4mm symmetry (#99)), which displays a local JT distortion, shows the poorest performance.

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