Journal
NANOSCALE
Volume 7, Issue 23, Pages 10391-10397Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr01896j
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Funding
- National Basic Research Program of China [2012CB933301, 2014CB648300]
- Key Project of National High Technology Research of China [2011AA050526]
- Ministry of Education of China [IRT1148]
- National Synergistic Innovation Center for Advanced Materials (SICAM)
- Natural Science Foundation of Jiangsu Province, China [BM2012010]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [YX03001]
- National Natural Science Foundation of China [51172110, 51372119, 81273409, 61136003, 51173081]
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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).
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