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    Significant impact of the current collection material and method on the performance of Ba0.5Sr0.5Co0.8Fe 0.2O3-d electrodes in solid oxide fuel cells

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    Fulltext not available
    Authors
    Guo, Y.
    Zhou, Y.
    Chen, D.
    Shi, H.
    Ran, R.
    Shao, Zongping
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Guo, Y. and Zhou, Y. and Chen, D. and Shi, H. and Ran, R. and Shao, Z. 2011. Significant impact of the current collection material and method on the performance of Ba0.5Sr0.5Co0.8Fe 0.2O3-d electrodes in solid oxide fuel cells. Journal of Power Sources. 196 (13): pp. 5511-5519.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2011.02.056
    ISSN
    0378-7753
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/22546
    Collection
    • Curtin Research Publications
    Abstract

    The effects of the current collection material and method on the performance of SOFCs with Ba0.5Sr0.5Co 0.8Fe0.2O3-d (BSCF) cathodes are investigated. Ag paste and LaCoO3 (LC) oxide are studied as current collection materials, and five different current collecting techniques are attempted. Cell performances are evaluated using a current-voltage test and electrochemical impedance spectra (EIS) based on two types of anode-supported fuel cells, i.e., NiO + SDCSDCBSCF and NiO + YSZYSZSDCBSCF. The cell with diluted Ag paste as the current collector exhibits the highest peak power density, nearly 16 times that of a similar cell without current collector. The electrochemical characteristics of the BSCF cathode with different current collectors are further determined by EIS at 600 °C using symmetrical cells. The cell with diluted Ag paste as the current collector displays the lowest ohmic resistance (1.4 O cm2) and polarization resistance (0.1 O cm2). Meanwhile, the surface conductivities of various current collectors are measured by a four-probe DC conductivity technique. The surface conductivity of diluted Ag paste is 2-3 orders of magnitude higher than that of LC or BSCF. The outstanding surface conductivity of silver may reduce the contact resistance at the current collector/electrode interface and, thus, contributes to better electrode performance. © 2011 Elsevier B.V. All rights reserved.

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