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    Evaluation of Bi 2V 0.9Cu 0.1O 5.35-an Aurivillius-type conducting oxide-as a cathode material for single-chamber solid-oxide fuel cells

    Access Status
    Fulltext not available
    Authors
    Shao, Zongping
    Mederos, J.
    Kwak, C.
    Haile, S.
    Date
    2010
    Type
    Journal Article
    
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    Citation
    Shao, Z. and Mederos, J. and Kwak, C. and Haile, S. 2010. Evaluation of Bi 2V 0.9Cu 0.1O 5.35-an Aurivillius-type conducting oxide-as a cathode material for single-chamber solid-oxide fuel cells. Journal of Fuel Cell Science and Technology. 7 (2): pp. 0210161-0210168.
    Source Title
    Journal of Fuel Cell Science and Technology
    DOI
    10.1115/1.3182729
    ISSN
    1550-624X
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/23404
    Collection
    • Curtin Research Publications
    Abstract

    The compound Bi 2V 0.9Cu 0.1O 5.35, a typical Aurivillius-type fast oxygen ion conductor, was evaluated as a possible cathode material for single-chamber solid-oxide fuel cells operated under mixed propane and oxygen. The material was found to be structurally stable under various C 3H 8 + O 2 environments over a wide temperature range and furthermore displayed low catalytic activity for propane oxidation. However, at temperatures above 650 °C, detrimental reactions between the cathode and the ceria electrolyte occurred, producing low conductivity interfacial phases. At these high temperatures the cathode additionally underwent extensive sintering and loss of porosity and, thus, stable fuel cell operation was limited to furnace temperatures of <600 °C. Even under such conditions, however, the partial oxidation occurring at the anode (a ceria nickel cermet) resulted in cell temperatures as much as 70-110°C higher than the gas-phase temperature. This explains the sharp decrease in fuel cell performance with time during operation at a furnace temperature of 586 °C. Under optimized conditions, a peak power density of ~60 mW/cm2 was obtained, which does not compete with recent values obtained from higher activity cathodes. Thus, the poor electrochemical activity of Bi 2V 0.9Cu 0.1O 5.35, combined with its chemical instability at higher temperatures, discourages further consideration of this material as a cathode in single-chamber fuel cells. Copyright © 2010 by ASME.

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