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    Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries

    Access Status
    Open access via publisher
    Authors
    Zhong, Yijun
    Dai, J.
    Xu, Xiaomin
    Su, Chao
    Shao, Zongping
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhong, Y. and Dai, J. and Xu, X. and Su, C. and Shao, Z. 2020. Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc-Air Batteries. ChemElectroChem. 7 (24): pp. 4949-4955.
    Source Title
    ChemElectroChem
    DOI
    10.1002/celc.202001419
    Additional URLs
    https://chemistry-europe.onlinelibrary.wiley.com/doi/am-pdf/10.1002/celc.202001419
    ISSN
    2196-0216
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP200103332
    http://purl.org/auresearch/grants/arc/DP200103315
    http://purl.org/au-research/grants/arc/LE0775553
    http://purl.org/au-research/grants/arc/LE0775551
    URI
    http://hdl.handle.net/20.500.11937/91960
    Collection
    • Curtin Research Publications
    Abstract

    Bifunctional oxygen catalyst is an important component in the cathode for rechargeable zinc-air batteries. MnO2 catalysts have aroused intense interests owing to their promising activity for oxygen reduction reaction (ORR), which, however, is still not comparable to precious metal catalysts. To improve the ORR catalysis and meet the requirement for a bifunctional oxygen catalyst, MnO2 nanosheets are modified with Co, Ni or Fe via a facile solution-based method. Among the modified samples, Co−MnO2 presents improved catalysis for both ORR and oxygen evolution reaction (OER). The modification introduces additional active sites for OER and induced more oxygen defects to further facilitate the ORR. Zn-air batteries with the Co−MnO2 air cathode showed a higher peak power density of 167 mW cm−2, a lower potential gap of 0.75 V and a higher round-trip efficiency of 63 % (5 mA cm−2) compared to MnO2 without modification. Good cycling stability of the battery is also achieved. The proper amount of cobalt species in the MnO2 is vital for achieving a balance between high performance and durable cycling.

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