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    Smart utilization of cobaltite-based double perovskite cathodes on barrier-layer-free zirconia electrolyte of solid oxide fuel cells

    251256.pdf (1.670Mb)
    Access Status
    Open access
    Authors
    Li, Meng
    Chen, Kongfa
    Hua, B.
    Luo, J.
    Rickard, William
    Li, J.
    Irvine, J.
    Jiang, San Ping
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, M. and Chen, K. and Hua, B. and Luo, J. and Rickard, W. and Li, J. and Irvine, J. et al. 2016. Smart utilization of cobaltite-based double perovskite cathodes on barrier-layer-free zirconia electrolyte of solid oxide fuel cells. Journal of Materials Chemistry A. 4 (48): pp. 19019-19025.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c6ta08396j
    ISSN
    2050-7488
    School
    John de Laeter Centre
    Fuels and Energy Technology Institute
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102025
    http://purl.org/au-research/grants/arc/DP150102044
    URI
    http://hdl.handle.net/20.500.11937/52721
    Collection
    • Curtin Research Publications
    Abstract

    Cobaltite-based double perovskite oxides with high electrocatalytic activity and conductivity have been developed as high-performance cathode alternatives for solid oxide fuel cells (SOFCs). However, the use of cobaltite-based double perovskites on Y2O3 stabilized ZrO2 (YSZ)-based SOFCs requires the application of a doped ceria barrier layer. This is due to their poor chemical and physical compatibility with the YSZ electrolyte during high-temperature sintering and fabrication processes. Here we report a viable approach to in operando assemble double perovskites such as PrBa0.5Sr0.5Co1.5Fe0.5O5+d (PBSCF), on YSZ electrolyte and thus effectively form an electrode/electrolyte interface without high-temperature processing. The electrochemical performance of the in situ assembled PBSCF cathode is comparable to that of the cathode prepared by conventional methods. A single cell with an in situ assembled PBSCF-GDC (Gd-doped ceria) cathode achieved a peak power density (PPD) of 1.37 W cm-2 at 750 °C and exhibited a high stability at 500 mA cm-2 and 750 °C for 100 h. Surface and cross-sectional microstructure analysis offer solid evidence that the PBSCF-GDC cathode/YSZ electrolyte interface was formed by electrochemical polarization. This work offers new opportunities to effectively and effortlessly use high-performance double perovskite cathodes in commercial SOFCs.

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