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    Few-Layered Trigonal WS2Nanosheet-Coated Graphite Foam as an Efficient Free-Standing Electrode for a Hydrogen Evolution Reaction

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    Fulltext not available
    Authors
    Guo, X.
    Ji, J.
    Jiang, Q.
    Zhang, L.
    Ao, Z.
    Fan, X.
    Wang, Shaobin
    Li, Y.
    Zhang, F.
    Zhang, G.
    Peng, W.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Guo, X. and Ji, J. and Jiang, Q. and Zhang, L. and Ao, Z. and Fan, X. and Wang, S. et al. 2017. Few-Layered Trigonal WS2Nanosheet-Coated Graphite Foam as an Efficient Free-Standing Electrode for a Hydrogen Evolution Reaction. ACS Applied Materials and Interfaces. 9 (36): pp. 30591-30598.
    Source Title
    ACS Applied Materials and Interfaces
    DOI
    10.1021/acsami.7b06613
    ISSN
    1944-8244
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/57823
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 American Chemical Society. Few-layered tungsten disulfide (WS 2 ) with a controlled-phase ratio (the highest trigonal-phase ratio being 67%) was exfoliated via lithium insertion. The exfoliated WS 2 nanosheets were then anchored onto three-dimensional (3D) graphite foam (GF) to fabricate free-standing binder-free electrodes. The 3D GF can increase the interfacial contact between the WS 2 nanosheets and the electrolyte and facilitate ion transfer. Without the nonconductive binder, an intimate contact between the WS 2 and GF interface can be created, leading to the improvement of electrical conductivity. In comparison to the pure WS 2 nanosheets, the overpotential for a hydrogen evolution reaction is significantly decreased from 350 mV to 190 mV at 10 mA/cm 2 , and no deactivation occurs after 1000 cycles. The density functional theory computations reveal that the efficient catalytic activity of the trigonal-phase WS 2 /GF electrode is attributed to the lower Gibbs free energy for H* adsorption and higher electrical conductivity.

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