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    The production of cobalt sulfide/graphene composite for use as a low-cost counter-electrode material in dye-sensitized solar cells

    Access Status
    Fulltext not available
    Authors
    Wang, G.
    Zhang, J.
    Kuang, S.
    Liu, Shaomin
    Zhuo, S.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, G. and Zhang, J. and Kuang, S. and Liu, S. and Zhuo, S. 2014. The production of cobalt sulfide/graphene composite for use as a low-cost counter-electrode material in dye-sensitized solar cells. Journal of Power Sources. 269: pp. 473-478.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2014.07.018
    ISSN
    0378-7753
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/16031
    Collection
    • Curtin Research Publications
    Abstract

    Cobalt sulfide (CoS)/graphene composites are prepared by a facile one-pot hydrothermal method in the presence of graphene oxide and used as a low-cost substitute for Pt to fabricate the counter electrode in dye-sensitized solar cells. TEM, SEM and AFM characterizations show that CoS nanoparticles are highly dispersed on the surface of graphene nanosheets. This unique nanostructure affords a promising synergistic effect on electrocatalytic performance for the iodide/triiodide redox reaction. Electrochemical impedance spectroscopy and Tafel polarization analyses confirm that the CoS/graphene composite indeed provides simultaneously superior electrocatalytic activity and enhanced electrical conductivity as the counter electrode for dye-sensitized solar cells. Under an illumination of AM 1.5 simulated solar light (100 mW cm−2), the dye-sensitized solar cell based on the CoS/graphene composite counter electrode achieves a conversion efficiency of 7.08%, which is comparable to that of the cell based on Pt electrode and much higher than those of the devices with CoS and graphene electrodes.

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