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    A stability study of impregnated LSCF–GDC composite cathodes of solid oxide fuel cells

    193520.pdf (1.319Mb)
    Access Status
    Open access
    Authors
    Liu, Y.
    Wang, F.
    Chi, B.
    Pu, J.
    Jian, L.
    Jiang, San Ping
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Liu, Yihui and Wang, Fangzhong and Chi, Bo and Pu, Jian and Jian, Li and Jiang, San Ping. 2013. A stability study of impregnated LSCF–GDC composite cathodes of solid oxide fuel cells. Journal of Alloys and Compounds. 578: pp. 37-43.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2013.05.021
    ISSN
    0925-8388
    URI
    http://hdl.handle.net/20.500.11937/6882
    Collection
    • Curtin Research Publications
    Abstract

    The performance degradation of composite cathodes of La0.6Sr0.4Co0.2Fe0.8O3−δ and Gd-doped ceria (LSCF–GDC), prepared by impregnating the porous GDC scaffold with a nitrate solution containing La, Sr, Co and Fe in desired composition, is investigated at 750 °C and open circuit in air for 500 h. The performance of the impregnated LSCF–GDC composite cathodes deteriorates after testing at 750 °C for 500 h; the electrode polarization resistance (Rp) increases from 0.38 to 0.83 Ω cm2, and the electrode ohmic resistance (Ro) increases from 1.79 to 2.14 Ω cm2. The grain growth and coarsening of impregnated LSCF nanoparticles are responsible for the performance degradation of the cathodes. XPS analysis shows the enrichment of cobalt on the surface of the infiltrated LSCF–GDC cathodes and such surface segregation could also contribute to the degradation of the electrocatalytic activity of the cathodes. Introducing MgO and LaNi0.6Fe0.4O3 phases can effectively suppress the coarsening of LSCF nanoparticles and enhance the stability of the cathodes. However, the enhancing effect is related to the conductivity and electrocatalytic activity of the introduced phases.

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