\WS2\ nanosheets based on liquid exfoliation as effective electrocatalysts for hydrogen evolution reaction
By Guan-Qun Han and Yan-Ru Liu and Wen-Hui Hu and Bin Dong and Xiao Li and Yong-Ming Chai and Yun-Qi Liu and Chen-Guang Liu
Published in Materials Chemistry and Physics
2015
Abstract
\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