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    Effect of Pd doping on the activity and stability of directly assembled La0.95Co0.19Fe0.76Pd0.05O3-δ cathodes of solid oxide fuel cells

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    Authors
    Li, N.
    Ai, N.
    He, S.
    Cheng, Y.
    Rickard, William
    Chen, K.
    Zhang, T.
    Jiang, S.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, N. and Ai, N. and He, S. and Cheng, Y. and Rickard, W. and Chen, K. and Zhang, T. et al. 2018. Effect of Pd doping on the activity and stability of directly assembled La0.95Co0.19Fe0.76Pd0.05O3-δ cathodes of solid oxide fuel cells. Solid State Ionics. 316: pp. 38-46.
    Source Title
    Solid State Ionics
    DOI
    10.1016/j.ssi.2017.12.020
    ISSN
    0167-2738
    School
    John de Laeter Centre
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102025
    http://purl.org/au-research/grants/arc/DP150102044
    URI
    http://hdl.handle.net/20.500.11937/61207
    Collection
    • Curtin Research Publications
    Abstract

    Sr doping is a common strategy to enhance the electrocatalytic activity of perovskite cathode materials of solid oxide fuel cells (SOFCs), but the tendency of Sr surface segregation, chemical incompatibility with yttria-stabilized zirconia (YSZ) and interaction with volatile contaminants such as chromium in SOFC stacks lead to a loss of long-term cell performance. Herein, a Sr-free and Pd-doped La 0.95 Co 0.19 Fe 0.76 Pd 0.05 O 3-d (LCFPd) cathode is directly assembled on a barrier-layer-free YSZ electrolyte cell without conventional high temperature pre-sintering. The cell with the directly assembled LCFPd-GDC (gadolinium-doped ceria) composite cathode exhibits a peak power density of 1035 mW cm - 2 and excellent operation stability at 750 °C for 200 h. Cathodic polarization significantly enhances the electrode/electrolyte interface contact, indicated by the substantial decrease of cell ohmic resistance from 0.28 O cm 2 to 0.14 O cm 2 after polarization at 500 mA cm - 2 and 750 °C for 120 h. Detailed elemental analysis indicates that doped Pd could be segregated on the electrode surface under fuel cell operation conditions, which significantly enhances the electrocatalytic activity for the O 2 reduction reaction. This study provides new strategy to develop cobaltite based perovskite materials directly on YSZ electrolyte.

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