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    Enhanced CO2 electrolysis with a SrTiO3 cathode through a dual doping strategy

    Access Status
    Fulltext not available
    Authors
    Ye, L.
    Hu, X.
    Wang, X.
    Chen, F.
    Tang, D.
    Dong, Dehua
    Xie, K.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Ye, L. and Hu, X. and Wang, X. and Chen, F. and Tang, D. and Dong, D. and Xie, K. 2019. Enhanced CO2 electrolysis with a SrTiO3 cathode through a dual doping strategy. Journal of Materials Chemistry A. 7 (6): pp. 2764-2772.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c8ta10188d
    ISSN
    2050-7488
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/73876
    Collection
    • Curtin Research Publications
    Abstract

    The significant role of perovskite defect chemistry through A-site doping of strontium titanate with lanthanum for CO2 electrolysis properties is demonstrated. Here we present a dual strategy of A-site deficiency and promoting adsorption/activation by making use of redox active dopants such as Mn/Cr linked to oxygen vacancies to facilitate CO2 reduction at perovskite titanate cathode surfaces. Solid oxide electrolysers based on oxygen-excess La0.2Sr0.8Ti0.9Mn(Cr)0.1O3+d, A-site deficient (La0.2Sr0.8)0.9Ti0.9Mn(Cr)0.1O3-d and undoped La0.2Sr0.8Ti1.0O3+d cathodes are evaluated. In situ infrared spectroscopy reveals that the adsorbed and activated CO2 adopts an intermediate chemical state between a carbon dioxide molecule and a carbonate ion. The double strategy leads to optimal performance being observed after 100 h of high-temperature operation and 3 redox cycles, suggesting a promising cathode material for CO2 electrolysis.

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