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    Structurally confined ultrafine NiO nanoparticles on graphene as a highly efficient and durable electrode material for supercapacitors

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    Fulltext not available
    Authors
    Cheng, Yi
    Pan, Jian
    Saunders, M.
    Yao, Shikui
    Shen, P.
    Wang, H.
    Jiang, San Ping
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Cheng, Y. and Pan, J. and Saunders, M. and Yao, S. and Shen, P. and Wang, H. and Jiang, S.P. 2016. Structurally confined ultrafine NiO nanoparticles on graphene as a highly efficient and durable electrode material for supercapacitors. RSC Advances. 6 (56): pp. 51356-51366.
    Source Title
    RSC Advances
    DOI
    10.1039/c6ra04880c
    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/20.500.11937/28727
    Collection
    • Curtin Research Publications
    Abstract

    The most significant challenge in the development of ultrafine oxide based supercapacitors is the poor microstructure stability due to the rapid agglomeration of the fine nanoparticles (NPs). Here, we developed novel amorphous MnOx structurally confined ultrafine NiO NPs (~2.3 nm) supported on graphene, NiO@MnOxvia a simple and facile self-assembly process with the assistance of microwave sintering. NiO@MnOx with a NiO-MnOx weight ratio of 1-0.2 achieves a high capacitance of 966 F g-1 based on total electrode materials and 3222 F g-1 based on active materials at a discharge current density of 2 A g-1. Remarkably, the materials retain 100% capacitance after 2000 cycles at a charge and discharge current of 10 A g-1. In contrast, the durability of ultrafine NiO NPs without MnOx confinement is very poor, with 94% of the capacitance lost under identical cyclic conditions despite the initial high capacitance of 3696 F g-1. The substantially enhanced capacitance, durability and high rate capacity contribute to the formation of a nanoporous and amorphous MnOx layer on ultrafine NiO NPs, which provides the extraordinary structural confinement and enhances the mass transfer process. The results provide a new strategy to develop highly efficient and durable ultrafine nanosized electrode materials for supercapacitors.

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