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|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|
|Citation:||ACS Applied Materials and Interfaces, 2017; 9(36):30591-30598|
|Publisher:||American Chemical Society|
|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|
|Appears in Collections:||Aurora harvest 3|
Chemical Engineering publications
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