Layer-controllable WS2-reduced graphene oxide hybrid nanosheets with high electrocatalytic activity for hydrogen evolution

作者：Zhang, Jian; Wang, Qi; Wang, Lianhui; Li, Xing'ao^*; Huang, Wei

来源：Nanoscale, 2015, 7(23): 10391-10397.

DOI：10.1039/c5nr01896j

• TRANSITION-METAL DICHALCOGENIDES
• SINGLE-LAYER
• TUNGSTEN DISULFIDE
• MOS2
• WS2
• CATALYST
• GROWTH
• PHOSPHIDE
• STORAGE
• SULFIDE

In this study, an efficient poly(vinylpyrrolidone) (PVP)-assisted hydrothermal method for the in situ growth of WS2 nanosheets with layer-controllability on reduced graphene oxide (rGO) is reported. The number of layers (from a monolayer to similar to 25 layers) of the exfoliated WS2 can be accurately controlled by adjusting the amount of PVP. The layer structure and the morphology of the as-prepared hybrids are confirmed by field emission scanning electron microscopy and high-resolution transmission microscopy. The X-ray diffraction, Raman, and X-ray photoemission spectroscopy of the obtained WS2-rGO hybrid nanosheets indicate highly crystallized structures, a clear Raman shift and a stoichiometry, which is dependent on the number of layers. Furthermore, these highly active and durable catalysts exhibit an electrocatalytic current density of 10 mA cm(-2) at a small hydrogen evolution reaction (HER) overpotential (-170 mV) and a Tafel slope of 52 mV dec(-1) with an excellent electrocatalytic stability (after 6 months storage).

• 出版日期2015
• 单位南京工业大学; 南京邮电大学