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    Graphene decorated with multiple nanosized active species as dual function electrocatalysts for lithium-oxygen batteries

    Access Status
    Fulltext not available
    Authors
    Wang, S.
    Suo, Y.
    Su, C.
    Chen, Y.
    Zhu, Y.
    Shao, Zongping
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, S. and Suo, Y. and Su, C. and Chen, Y. and Zhu, Y. and Shao, Z. 2016. Graphene decorated with multiple nanosized active species as dual function electrocatalysts for lithium-oxygen batteries. Electrochimica Acta. 188: pp. 718-726.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2015.12.046
    ISSN
    0013-4686
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/8657
    Collection
    • Curtin Research Publications
    Abstract

    Development of an oxygen electrode with high stability and good electrochemical activity is critical to achieve the practical applications of rechargeable lithium-oxygen batteries (LOBs) in our daily life. here, we report the facile synthesis of a graphene-based composite as an efficient dual function precious-metal-free electrocatalyst for LOBs by applying graphite oxide as the graphene precursor, aniline as the carbon and nitrogen source, FeCl3 and Co(NO3)2·6H2O as the cation sources and argon as the atmosphere during the pyrolysis. Scanning electron microscope and transmission electron microscope observations demonstrate that the as-prepared electrocatalyst is composed of graphene sheets with nanoparticles mainly in the size of 20-50 nm, while X-ray diffraction characterization confirms that the sample is composed of multiple species such as carbon, cobalt/iron oxide, cobalt/iron sulfide and metallic iron. The cyclic voltammetry and linear sweep voltammograms tests of the electrocatalyst demonstrate favorable electrocatalytic activity for both oxygen reduction and evolution reactions, suggesting its bifunctionality. With the electrocatalyst/Ketjen Black (KB) oxygen electrode applying in LOBs, a specific capacity of 4772 mAh gKB−1 and a discharge plateau potential of ~2.75 V are reached at the density of 100 mA gKB−1 for the related LOBs by discharging to 2.0 V and charging to 4.4 V.

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