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    Chromium and Sulfur Contaminants on La0.6Sr0.4Co0.2Fe0.8O3-δ Cathodes of Solid Oxide Fuel Cells

    231384_231384.pdf (1.257Mb)
    Access Status
    Open access
    Authors
    Wang, C.
    O'Donnell, Kane
    Jian, L.
    Jiang, San Ping
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, C. and O'Donnell, K. and Jian, L. and Jiang, S.P. 2015. Co-Deposition and Poisoning of Chromium and Sulfur Contaminants on La0.6Sr0.4Co0.2Fe0.8O3-δ Cathodes of Solid Oxide Fuel Cells. Journal of the Electrochemical Society. 162 (6): pp. F507-F512.
    Source Title
    Journal of the Electrochemical Society
    DOI
    10.1149/2.0231506jes
    ISSN
    0013-4651
    School
    Department of Physics and Astronomy
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc-nd/4.0/

    URI
    http://hdl.handle.net/20.500.11937/17106
    Collection
    • Curtin Research Publications
    Abstract

    The presence of both chromium and sulfur (Cr/S) contaminants on the microstructure and electrocatalytic activity properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) electrodes of solid oxide fuel cells (SOFCs) is studied, using Confocal laser Raman spectroscopy, XRD, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS) and electrical conductivity relaxation (ECR) methods. LSCF dense bar samples were heat treated in the presence of Cr2O3 and 20 ppm SO2 and in the temperature range of 600–900°C. The deposition and reaction products between LSCF and Cr/S depend on the temperature: SrCrO4 only forms on LSCF samples at 900°C and 800°C, while formation of SrSO4 phase occurs at all temperatures studied. The results indicate that sulfur shows a higher activity with LSCF, as compared to gaseous Cr species. Segregated SrO is more likely to react with gaseous Cr species at higher temperatures, however, reaction with SO2 is more pronounced at lower temperatures, forming SrSO4. ECR results indicate that co-deposition of Cr and sulfur significantly deteriorates the surface exchange and diffusion processes for the O2 reduction reaction on LSCF electrodes.

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    • Effect of SO2 Poisoning on the Electrochemical Activity of La0.6Sr0.4Co0.2Fe0.8O3-δ Cathodes of Solid Oxide Fuel Cells
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      The effect of sulfur deposition and poisoning on the electrochemical activity of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode of solid oxide fuel cells (SOFCs) for the O2 reduction reaction is studied under accelerated ...
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      © 2018 IOP Publishing Ltd. Electrochemical performance and sulfur (SO2) tolerance were studied on pristine La0.6Sr0.4Co0.2Fe0.8O3-d(LSCF) and BaCeO3-impregnated LSCF (BaCeO3-LSCF) composite cathodes of solid oxide fuel ...
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      Sulfur in the air stream is one of the major contaminants affecting the performance stability of cathodes of solid oxide fuel cells (SOFCs) such as La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) perovskite. Here sulfur deposition and ...
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