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    Non-aqueous hybrid supercapacitors fabricated with mesoporous TiO 2 microspheres and activated carbon electrodes with superior performance

    Access Status
    Fulltext not available
    Authors
    Cai, Y.
    Zhao, B.
    Wang, J.
    Shao, Zongping
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Cai, Y. and Zhao, B. and Wang, J. and Shao, Z. 2014. Non-aqueous hybrid supercapacitors fabricated with mesoporous TiO 2 microspheres and activated carbon electrodes with superior performance. Journal of Power Sources. 253: pp. 80-89.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2013.11.097
    ISSN
    0378-7753
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/47080
    Collection
    • Curtin Research Publications
    Abstract

    Mesoporous TiO2 microspheres, synthesized by a facile template-free solvothermal method and subsequent heat treatment, are exploited as the electrode for hybrid supercapacitors. The effects of the calcination temperature on the phase composition, particulate microstructure and morphology are characterized by XRD, Raman, FE-SEM and N2 adsorption/desorption measurements. Hybrid supercapacitors utilizing the as-prepared TiO2 mesoporous microspheres as the negative electrode and activated carbon (AC) as the positive electrode in a non-aqueous electrolyte are fabricated. The electrochemical performance of these hybrid supercapacitors is studied by galvanostatic charge-discharge and cyclic voltammetry (CV). The hybrid supercapacitor built from TiO2 microspheres calcined at 400 C shows the best performance, delivering an energy density of 79.3 Wh kg-1 at a power density of 178.1 W kg-1. Even at a power density of 9.45 kW kg-1, an energy density of 31.5 Wh kg-1 is reached. These values are much higher than the AC-AC symmetric supercapacitor. In addition, the hybrid supercapacitor exhibits excellent cycling performance, retaining 98% of the initial energy density after 1000 cycles. Such outstanding electrochemical performance of the hybrid supercapacitor is attributed to the matched reaction kinetics between the two electrodes with different energy storage mechanisms.

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