Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/117094
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Type: Journal article
Title: Few-layered trigonal WS₂ nanosheet-coated graphite foam as an efficient free-standing electrode for a hydrogen evolution reaction
Other Titles: Few-layered trigonal WS(2) nanosheet-coated graphite foam as an efficient free-standing electrode for a hydrogen evolution reaction
Author: Guo, X.
Ji, J.
Jiang, Q.
Zhang, L.
Ao, Z.
Fan, X.
Wang, S.
Li, Y.
Zhang, F.
Zhang, G.
Peng, W.
Citation: ACS Applied Materials and Interfaces, 2017; 9(36):30591-30598
Publisher: American Chemical Society
Issue Date: 2017
ISSN: 1944-8244
1944-8252
Statement of
Responsibility: 
Xiaomeng Guo, Junyi Ji, Quanguo Jiang, Lili Zhang, Zhimin Ao, Xiaobin Fan, Shaobin Wang, Yang Li, Fengbao Zhang, Guoliang Zhang, and Wenchao Peng
Abstract: Few-layered tungsten disulfide (WS₂) with a controlled-phase ratio (the highest trigonal-phase ratio being 67%) was exfoliated via lithium insertion. The exfoliated WS₂ 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 WS₂ nanosheets and the electrolyte and facilitate ion transfer. Without the nonconductive binder, an intimate contact between the WS₂ and GF interface can be created, leading to the improvement of electrical conductivity. In comparison to the pure WS₂ nanosheets, the overpotential for a hydrogen evolution reaction is significantly decreased from 350 mV to 190 mV at 10 mA/cm², and no deactivation occurs after 1000 cycles. The density functional theory computations reveal that the efficient catalytic activity of the trigonal-phase WS₂/GF electrode is attributed to the lower Gibbs free energy for H* adsorption and higher electrical conductivity.
Keywords: Tungsten disulphide; mixed phase; graphite foam; hydrogen evolution; binder-free electrode
Rights: © 2017 American Chemical Society
DOI: 10.1021/acsami.7b06613
Appears in Collections:Aurora harvest 3
Chemical Engineering publications

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