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    A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer

    Access Status
    Fulltext not available
    Authors
    Chen, S.
    Xie, K.
    Dong, Dehua
    Li, H.
    Qin, Q.
    Zhang, Y.
    Wu, Y.
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Chen, S. and Xie, K. and Dong, D. and Li, H. and Qin, Q. and Zhang, Y. and Wu, Y. 2015. A composite cathode based on scandium-doped chromate for direct high-temperature steam electrolysis in a symmetric solid oxide electrolyzer. Journal of Power Sources. 274: pp. 718-729.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2014.10.103
    ISSN
    0378-7753
    School
    Fuels and Energy Technology Institute
    URI
    http://hdl.handle.net/20.500.11937/3920
    Collection
    • Curtin Research Publications
    Abstract

    Composite cathodes based on La0.75Sr0.25Cr0.5Mn0.5O3-d (LSCM) are promising candidates for direct steam electrolysis while their insufficient electro-catalytic activity still restricts Faradic efficiency and electrode performance. In this work, scandium is doped into LSCM (LSCMS) to enhance the performance of the composite cathode. The combined characterization of XRD, TEM, TGA and XPS indicates successful partial replacement of Cr/Mn by scandium in the B site of chromate. The doping of scandium remarkably improves ionic conductivity while accordingly decreases the mixed conductivity. Electrochemical measurements demonstrate the decreased electrode polarizations of LSCMS cathodes. The Faradic efficiencies are accordingly enhanced by 20% and 50% compared with the electrolyzer with LSCM cathode for high temperature steam electrolysis by exposing cathode to 5%H2O/5%H2/Ar and 5%H2O/Ar, respectively.

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