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    Coking-resistant Ce0.8Ni0.2O2-δ internal reforming layer for direct methane solid oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Zhao, J.
    Xu, X.
    Li, M.
    Zhou, W.
    Liu, Shaomin
    Zhu, Z.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhao, J. and Xu, X. and Li, M. and Zhou, W. and Liu, S. and Zhu, Z. 2018. Coking-resistant Ce0.8Ni0.2O2-δ internal reforming layer for direct methane solid oxide fuel cells. Electrochimica Acta. 282: pp. 402-408.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2018.06.088
    ISSN
    0013-4686
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/70030
    Collection
    • Curtin Research Publications
    Abstract

    The development of direct methane solid oxide fuel cells (SOFCs) is severely hindered by the deactivation of conventional Ni-based anodes due to carbon fouling. Here, a Ce0.8Ni0.2O2-d(CNO) internal reforming layer is imposed on conventional Ni-Sm0.2Ce0.8O2-x(SDC) anodes for direct methane SOFCs. In CNO, there are two types of Ni species which are segregated NiO dispersed over the CNO and incorporated Ni2+in the ceria lattice, respectively. The Ni2+dopants are stable in wet hydrogen at 650 °C; however, the segregated NiO is reduced into Ni under the same conditions. With the doping of Ni2+into the ceria lattice, surface oxygen vacancies are generated in CNO. For the stability testing in wet methane (~3 mol% H2O in methane) at 650 °C and 0.2 A cm-2, the voltage of the conventional Ni-SDC anode decreases by 43.1% in approximately 26 h, whereas the CNO internal reforming layer operates stably for 40 h. In wet methane at 650 °C, with the addition of the CNO internal reforming layer, the polarization resistance of the Ni-SDC anode reduces by 22.3% from 0.0917 to 0.0712 O cm2, and the maximum current density of it increases from 614 to 664 mW cm-2.

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