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    In Situ Formation of Er0.4Bi1.6O3 Protective Layer at Cobaltite Cathode/Y2O3–ZrO2 Electrolyte Interface under Solid Oxide Fuel Cell Operation Conditions

    71339.pdf (1.245Mb)
    Access Status
    Open access
    Authors
    He, Shuai
    Zhang, Qi
    Maurizio, Giulio
    Catellani, Lorenzo
    Chen, K.
    Chang, Q.
    Santarelli, M.
    Jiang, San Ping
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    He, S. and Zhang, Q. and Maurizio, G. and Catellani, L. and Chen, K. and Chang, Q. and Santarelli, M. et al. 2018. In Situ Formation of Er0.4Bi1.6O3 Protective Layer at Cobaltite Cathode/Y2O3–ZrO2 Electrolyte Interface under Solid Oxide Fuel Cell Operation Conditions. ACS Applied Materials and Interfaces. 10 (47): 40549-40559.
    Source Title
    ACS Applied Materials and Interfaces
    DOI
    10.1021/acsami.8b14026
    ISSN
    1944-8244
    School
    Fuels and Energy Technology Institute
    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/DP180100731
    http://purl.org/au-research/grants/arc/DP180100568
    Remarks

    This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/acsami.8b14026, see http://pubs.acs.org/page/policy/articlesonrequest/index.html.

    URI
    http://hdl.handle.net/20.500.11937/71096
    Collection
    • Curtin Research Publications
    Abstract

    © Copyright 2018 American Chemical Society. Bismuth-based oxides exhibit outstanding oxygen ionic conductivity and fast oxygen surface kinetics and have shown great potential as a highly active component for electrode materials in solid oxide fuel cells (SOFCs). Herein, a Nb-doped La0.6Sr0.4Co0.2Fe0.7Nb0.1O3-d (LSCFNb) electrode with 40% Er0.4Bi1.6O3 (ESB) composite electrode was successfully fabricated by decoration method and directly assembled on barrier-layer-free yttrium-stabilized zirconia (YSZ) electrolyte cells, achieving a peak power density of 1.32 W cm-2 and excellent stability at 750 °C and 250 mA cm-2 for 100 h. ESB decoration also significantly reduces the activation energy from 214 kJ mol-1 for the O2 reduction on pristine LSCFNb electrode to 98 kJ mol-1. Further microstructural analysis reveals that there is a redistribution and migration of the ESB phase in the ESB-LSCFNb composite toward the YSZ electrolyte under the influence of cathodic polarization, forming a thin ESB layer at the cathode/YSZ electrolyte interface. The in situ formed ESB layer not only prevents the direct contact and subsequent reaction between segregated SrO and YSZ electrolytes, but also remarkably promotes the oxygen migration/diffusion at the interface for O2 reduction reaction, resulting in a remarkable increase in power output and a decrease in activation energy. The present study clearly demonstrated the in situ formation of a highly functional and active ESB protective layer at LSCFNb cobaltite cathode and YSZ electrolyte interface via ESB-decorated LSCFNb composite cathode under SOFC operation conditions.

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