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    Carbon-tolerant Ni-based cermet anodes modified by proton conducting yttrium- and ytterbium-doped barium cerates for direct methane solid oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Li, M.
    Hua, B.
    Luo, J.
    Jiang, San Ping
    Pu, J.
    Chi, B.
    Jian, L.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Li, M. and Hua, B. and Luo, J. and Jiang, S.P. and Pu, J. and Chi, B. and Jian, L. 2015. Carbon-tolerant Ni-based cermet anodes modified by proton conducting yttrium- and ytterbium-doped barium cerates for direct methane solid oxide fuel cells. Journal of Materials Chemistry A. 3 (43): pp. 21609-21617.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c5ta06488k
    ISSN
    2050-7488
    School
    Fuels and Energy Technology Institute
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102025
    URI
    http://hdl.handle.net/20.500.11937/36525
    Collection
    • Curtin Research Publications
    Abstract

    © The Royal Society of Chemistry. Conventional Ni-based cermet anodes such as Ni-gadolinia doped ceria (Ni-GDC) suffer from low carbon deposition resistance in direct methane solid oxide fuel cells (SOFCs). Here we show that impregnating proton conducting perovskites like BaCe0.9Y0.1O3-d (BCY) and BaCe0.9Yb0.1O3-d (BCYb) in Ni-GDC not only improves the initial polarization performance but also, most importantly, significantly enhances the stability in wet methane fuel (3% H2O in CH4) by inhibiting carbon deposition and formation. In wet methane, the voltage of the cell with the conventional Ni-GDC anode decreases rapidly from 0.58 to 0.15 V within 6 h at 200 mA cm-2 and 750°C. In contrast, in the case of the cells with BCY + Ni-GDC and BCYb + Ni-GDC anodes, the cell voltage is essentially constant at 0.62-0.65 V over a period of 48 h tested under identical conditions. The microstructure and Raman spectroscopy analysis reveal that the impregnated fine BCY and BCYb particles are preferentially distributed on the surface of the Ni grains in the Ni-GDC anode, decreasing the exposed surface of Ni grains and inhibiting carbon deposition. Also, the proton conducting and fine BCY and BCYb particles can adsorb and decompose water, which in turn reacts with deposited carbon to form CO and H2, alleviating the carbon deposition problem in the anode and thus significantly improving the cell stability of direct methane SOFCs.

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