WS2 nanosheets based on liquid exfoliation as effective electrocatalysts for hydrogen evolution reaction

被引：75

作者：

Han, Guan-Qun ^{[1
,2
]}

Liu, Yan-Ru ^{[1
]}

Hu, Wen-Hui ^{[1
]}

Dong, Bin ^{[1
,2
]}

Li, Xiao ^{[1
]}

Chai, Yong-Ming ^{[1
]}

Liu, Yun-Qi ^{[1
]}

Liu, Chen-Guang ^{[1
]}

机构：

[1] China Univ Petr East China, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China

[2] China Univ Petr East China, Coll Sci, Qingdao 266580, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2015年 / 167卷

基金：

中国国家自然科学基金;

关键词：

Nanostructures; Chalcogenides; Monolayer; Electrochemical properties; TRANSITION-METAL DICHALCOGENIDES; ACTIVE EDGE SITES; MOS2; CATALYST; OXIDATION; GRAPHENE; H-2;

D O I：

10.1016/j.matchemphys.2015.10.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

WS2 nanosheets (WS2 NSs) as electrocatalysts for hydrogen evolution reaction (HER) have been prepared based on liquid exfoliation in dimethyl-formamide (DMF) via a direct dispersion and ultrasonication method. X-ray diffraction (XRD) shows the decreasing crystalline of the exfoliated WS2 (E-WS2). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the as prepared E-WS2 consists of a few two-dimensional nanosheets, with large wrinkles on the surface. Electrochemical measurements show an excellent activity and stability of the E-WS2, with a low overpotential of 80 mV and high current density (10 mA cm(-2), at eta = 205 mV), which indicates that through the process of exfoliation in DMF, both the dispersion and the amount of active sites have been improved greatly. Therefore, DMF is a promising alternative for exfoliating two-dimensional nanomaterials for highly efficient HER electrocatalysts. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：271 / 277

页数：7

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