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    Sr2Fe1.5Mo0.5O6-δ - Sm0.2Ce0.8O1.9 Composite Anodes for Intermediate-Temperature Solid Oxide Fuel Cells

    Access Status
    Fulltext not available
    Authors
    He, Beibei
    Zhao, Ling
    Song, S.
    Liu, T.
    Chen, F.
    Xia, C.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    He, B. and Zhao, L. and Song, S. and Liu, T. and Chen, F. and Xia, C. 2012. Sr2Fe1.5Mo0.5O6-δ - Sm0.2Ce0.8O1.9 Composite Anodes for Intermediate-Temperature Solid Oxide Fuel Cells. Journal of the Electrochemical Society. 159 (5): pp. B619-B626.
    Source Title
    Journal of the Electrochemical Society
    DOI
    10.1149/2.020206jes
    ISSN
    0013-4651
    URI
    http://hdl.handle.net/20.500.11937/5305
    Collection
    • Curtin Research Publications
    Abstract

    Sr2Fe1.5Mo0.5O6−δ (SFM) perovskite is carefully investigated as an anode material for solid oxide fuel cells with LaGaO3-based electrolytes. Its electronic conductivity under anodic atmosphere is measured with four-probe method while its ionic conductivity is determined with oxygen permeation measurement. Samaria doped ceria (SDC) is incorporated into SFM electrode to improve the anodic performance. A strong relation is observed between SDC addition and polarization losses, suggesting that the internal SFM-SDC contacts are active for H2 oxidation. The best electrode performance is achieved for the composite with 30 wt% SDC addition, resulting in an interfacial polarization resistance of 0.258 Ω cm2 at 700°C for La0.8Sr0.2Ga0.8Mg0.2O3−δ supported single cells. Electrochemical impedance spectroscopy analysis indicates that the high performance of SFM-SDC composite anodes is likely due to the high ionic conductivity and electro-catalytic activity of SDC by promoting the ionic exchange processes. Redox cycle treatment shows that SDC addition can even improve the redox tolerance of SFM anodes.

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