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    Two orders of magnitude enhancement in oxygen evolution reactivity on amorphous Ba0.5Sr0.5Co0.8Fe0.2O3-(delta) nanofilms with tunable oxidation state

    Access Status
    Open access via publisher
    Authors
    Chen, G.
    Zhou, W.
    Guan, D.
    Sunarso, J.
    Zhu, Y.
    Hu, X.
    Zhang, W.
    Shao, Zongping
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Chen, G. and Zhou, W. and Guan, D. and Sunarso, J. and Zhu, Y. and Hu, X. and Zhang, W. et al. 2017. Two orders of magnitude enhancement in oxygen evolution reactivity on amorphous Ba0.5Sr0.5Co0.8Fe0.2O3-(delta) nanofilms with tunable oxidation state. Sci Adv. 3 (6).
    Source Title
    Sci Adv
    DOI
    10.1126/sciadv.1603206
    ISSN
    2375-2548
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/58710
    Collection
    • Curtin Research Publications
    Abstract

    Perovskite oxides exhibit potential for use as electrocatalysts in the oxygen evolution reaction (OER). However, their low specific surface area is the main obstacle to realizing a high mass-specific activity that is required to be competitive against the state-of-the-art precious metal-based catalysts. We report the enhanced performance of Ba0.5Sr0.5Co0.8Fe0.2O3-d (BSCF) for the OER with intrinsic activity that is significantly higher than that of the benchmark IrO2, and this result was achieved via fabrication of an amorphous BSCF nanofilm on a surface-oxidized nickel substrate by magnetron sputtering. The surface nickel oxide layer of the Ni substrate and the thickness of the BSCF film were further used to tune the intrinsic OER activity and stability of the BSCF catalyst by optimizing the electronic configuration of the transition metal cations in BSCF via the interaction between the nanofilm and the surface nickel oxide, which enables up to 315-fold enhanced mass-specific activity compared to the crystalline BSCF bulk phase. Moreover, the amorphous BSCF-Ni foam anode coupled with the Pt-Ni foam cathode demonstrated an attractive small overpotential of 0.34 V at 10 mA cm(-2) for water electrolysis, with a BSCF loading as low as 154.8 µg cm(-2).

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    • Toward Enhanced Oxygen Evolution on Perovskite Oxides Synthesized from Different Approaches: A Case Study of Ba0.5Sr0.5Co0.8Fe0.2O3−δ
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      We develop a facile and effective top-down method for the fabrication of mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) oxide with a high specific surface area (∼25 m2 g−1). The original BSCF is first synthesized by the simple ...
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