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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 |
Published version: | http://dx.doi.org/10.1021/acsami.7b06613 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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