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    Active, durable bismuth oxide-manganite composite oxygen electrodes: Interface formation induced by cathodic polarization

    Access Status
    Fulltext not available
    Authors
    Chen, M.
    Cheng, Y.
    He, S.
    Ai, N.
    Veder, Jean-Pierre
    Rickard, William
    Saunders, M.
    Chen, K.
    Zhang, T.
    Jiang, San Ping
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Chen, M. and Cheng, Y. and He, S. and Ai, N. and Veder, J. and Rickard, W. and Saunders, M. et al. 2018. Active, durable bismuth oxide-manganite composite oxygen electrodes: Interface formation induced by cathodic polarization. Journal of Power Sources. 397: pp. 16-24.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2018.07.012
    ISSN
    0378-7753
    School
    John de Laeter Centre
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102025
    http://purl.org/au-research/grants/arc/DP150102044
    http://purl.org/au-research/grants/arc/DP180100568
    http://purl.org/au-research/grants/arc/DP180100731
    URI
    http://hdl.handle.net/20.500.11937/69722
    Collection
    • Curtin Research Publications
    Abstract

    Bismuth oxide is as an active promoter in enhancing the ionic conductivity and electrocatalytic activity of manganite oxygen electrodes of solid oxide cells, but there are very limited reports on the formation and evolution of electrode/electrolyte interface of bismuth oxide-manganite composite electrode under the influence of electrochemical polarization. Herein, we report the effect of electrochemical polarization and direction of polarization current on the electrocatalytic performance and electrode/electrolyte interface of a (La0·8Sr0.2)0.95Mn0·95Pt0·05O3+δ-Er0.4Bi1·6O3 (LSMPt-ESB) composite oxygen electrode assembled on zirconia electrolyte. The cell with the LSMPt-ESB electrode produces outstanding performance for power generation and steam splitting, and it is stable without noticeable degradation during operation at 600 °C for 350 h in the fuel cell mode. The cathodic polarization induces in operando formation of electrode/electrolyte interface with observation of an Er-deficient LSMPt-ESB dense layer and Er-rich (Er,Bi,Mn)Ox particles on the zirconia electrolyte surface. This is different to the case of dwell under open circuit and in particular under anodic polarization conditions. The present study gains insights into the development of high performance, reliable bismuth oxide-manganite composite oxygen electrode for reduced temperature solid oxide cells.

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