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    BaCo0.6Fe0.3Sn0.1O3-δ perovskite as a new superior oxygen reduction electrode for intermediate-to-low temperature solid oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Qian, B.
    Chen, Y.
    Tade, Moses
    Shao, Zongping
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Qian, B. and Chen, Y. and Tade, M. and Shao, Z. 2014. BaCo0.6Fe0.3Sn0.1O3-δ perovskite as a new superior oxygen reduction electrode for intermediate-to-low temperature solid oxide fuel cells. Journal of Materials Chemistry A. 214 (36): pp. 15078-15086.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c4ta02869d
    ISSN
    2050-7488
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/47420
    Collection
    • Curtin Research Publications
    Abstract

    BaCo0.6Fe0.3Sn0.1O3−δ (BCFSn631) is evaluated as an oxygen reduction electrode for intermediate-to-low temperature solid oxide fuel cells (SOFCs). XRD and HR-TEM analysis demonstrate that it is in a simple perovskite phase with cubic lattice symmetry. In situ HT-XRD and ex situ XRD confirm the favorable phase stability of the oxide under a wide range of temperatures and atmospheric oxygen partial pressures. The oxygen nonstoichiometry, electrical conductivity, oxygen reduction activity and electrochemical performance of BCFSn631 are systematically studied through thermogravimetric analysis, electrical conductivity relaxation tests and electrochemical impedance analysis. It has a low thermal expansion coefficient of [similar] ~15.8 x 10−6 K−1 in a temperature range of 25–800 °C and a high oxygen vacancy concentration. Electric conductivity relaxation measurement demonstrates the high oxygen surface exchange and bulk diffusion properties of BCFSn631, comparable to that of the state-of-the-art Ba0.5Sr0.5Co0.8Fe0.2O3−δ electrode. Low area specific resistances are obtained for the BCFSn631 electrode in the intermediate temperature range, determined by electrochemical impedance spectroscopy based on symmetrical cell configuration, suggesting its high activity for oxygen reduction reaction. Peak power densities of 1168, 896, 523 and 273 mW cm−2 are obtained from a fuel cell with BCFSn631 electrode at 600, 550, 500 and 450 °C, respectively. In addition, good long-term performance stability is demonstrated. All these results highly promise BCFSn631 as an excellent oxygen reduction electrode for next generation SOFCs.

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