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    Redox tolerance of thin and thick Ni/YSZ anodes of electrolyte-supported single-chamber solid oxide fuel cells under methane oxidation conditions

    Access Status
    Fulltext not available
    Authors
    Wang, Z.
    Lϋ, Z.
    Chen, Kongfa
    Wei, B.
    Zhu, X.
    Huang, X.
    Su, W.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, Z.H. and Lϋ, Z. and Chen, K.F. and Wei, B. and Zhu, X.B. and Huang, X.Q. and Su, W.H.. 2013. Redox tolerance of thin and thick Ni/YSZ anodes of electrolyte-supported single-chamber solid oxide fuel cells under methane oxidation conditions. Fuel Cells. 13 (6): pp. 1109-1115.
    Source Title
    Fuel Cells
    DOI
    10.1002/fuce.201200050
    ISSN
    1615-6854
    URI
    http://hdl.handle.net/20.500.11937/4940
    Collection
    • Curtin Research Publications
    Abstract

    Redox tolerance of 50 and 500 lm thick Ni/YSZ (yttria-stabilized zirconia) anodes supported on YSZ electrolytes were studied under single-chamber solid oxide fuel cell conditions. Open circuit voltage, electrochemical impedance spectra, and discharge curves of the cells were measured under different methane/oxygen ratios at 700°C. For the cell with the thin anode, a significant degradation accompanying oscillatory behaviors was observed, whereas the cell based on the thick anode was much more stable under the same conditions. In situ local anode resistance (Rs) results indicated that the Ni/NiO redox cycling was responsible for the oscillatory behaviors, and the cell degradation was primarily caused by the Ni reoxidation. Reoxidation of the thick anode took place at a low methane/oxygen ratio, but the anode can be recovered to its original state by switching to a methane rich environment. On the contrary, the thin anode was unable to be regenerated after the oxidation. Microstructure damage of the anode was attributed to its irreversible degradation.

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