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    Cobalt-site cerium doped SmxSr1-xCoO3-d oxides as potential cathode materials for solid-oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Zhang, G.
    Dong, X.
    Liu, Z.
    Zhou, W.
    Shao, Zongping
    Jin, W.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, G. and Dong, X. and Liu, Z. and Zhou, W. and Shao, Z. and Jin, W. 2010. Cobalt-site cerium doped SmxSr1-xCoO3-d oxides as potential cathode materials for solid-oxide fuel cells. Journal of Power Sources. 195 (11): pp. 3386-3393.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2009.12.039
    ISSN
    0378-7753
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/37722
    Collection
    • Curtin Research Publications
    Abstract

    A series of new oxides with the nominal composition of SmxSr1-xCo1-yCeyO3-d (x = 0.1, 0.3, 0.5; y = 0.05, 0.1) were synthesized. Their crystal structure, morphology, thermal expansion and electrochemical properties were systematically investigated. A phase-pure perovskite-type Sm0.3Sr0.7Co0.95Ce0.05O3-d oxide is obtained, while the other samples are actually composed of B-site cation deficient SmxSr1-xCo1-yCey-zO3-d (0 < z < y) and CeO2 mixed phases. These two-phase samples exhibit larger oxygen nonstoichiometry (d) and higher average thermal expansion coefficients (TEC), while the single-phase Sm0.3Sr0.7Co0.95Ce0.05O3-d oxide shows a smaller d and a lower TEC as compared to Sm0.3Sr0.7CoO3-d. The introduction of cerium also effectively suppresses the chemical expansion and the growth of grain particles. The smaller grain size is beneficial in improving the electrode surface area. In addition, the electrical conductivities of Ce-doped SmxSr1-xCoO3-d are all higher than 200 S cm-1. EIS tests demonstrate that partially substituting Co with Ce and the B-site deficiency improve the cathode performance. Sm0.3Sr0.7Co0.95Ce0.05O3-d shows the lowest area specific resistance (ASR) among the others. Through proper cobalt-site cerium doping, the SmxSr1-xCoO3-d related oxides could be developed into promising cathode materials for SOFC. © 2009 Elsevier B.V. All rights reserved.

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