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    A class of transition metal-oxide@MnO: X core-shell structured oxygen electrocatalysts for reversible O2 reduction and evolution reactions

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    Authors
    Cheng, Yi
    Dou, S.
    Saunders, M.
    Zhang, J.
    Pan, J.
    Wang, S.
    Jiang, S.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Cheng, Y. and Dou, S. and Saunders, M. and Zhang, J. and Pan, J. and Wang, S. and Jiang, S. 2016. A class of transition metal-oxide@MnO: X core-shell structured oxygen electrocatalysts for reversible O2 reduction and evolution reactions. Journal of Materials Chemistry A. 4 (36): pp. 13881-13889.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c6ta04758k
    ISSN
    2050-7488
    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
    URI
    http://hdl.handle.net/20.500.11937/50900
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 The Royal Society of Chemistry.It is highly desirable but challenging to develop a highly active as well as durable bifunctional electrocatalyst for the reversible oxygen reduction reaction and evolution reaction (ORR & OER). Here a new class of bifunctional oxygen electrocatalysts has been developed based on ultrafine transition metal-oxide nanoparticles (NPs), such as NiO, FeO or NiFeO, embedded in an amorphous MnOx shell, where the embedded NP core contributes to the high OER activity and the porous amorphous MnOx shell functions as an effective ORR catalyst as well as providing effective structural confinement to the metal-oxide NP core. The best performance was obtained for NiFeO@MnOx, exhibiting a potential gap, ?E, of 0.798 V to achieve a current of 3 mA cm-2 for the ORR and 5 mA cm-2 for the OER in 0.1 M KOH solution, better than that of Ir/C (0.924 V) and Pt/C (1.031 V). Most importantly, NiFeO@MnOx shows superior stability due to the outstanding structural confinement effect of the amorphous MnOx, achieving a ?E of 0.881 V after 300 cycles, outperforming 1.093 V obtained for the state-of-the-art Ir-Pt/C oxygen electrocatalysts.

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