Vanadium disulfide decorated graphitic carbon nitride for super-efficient solar-driven hydrogen evolution

Highly efficient, earth-abundant, and low-cost photocatalysts are widely pursued for solar-driven hydrogen generation from water. Herein, we first report vanadium disulfide (VS 2 ) with high hydrogen evolution reaction (HER) activity both in basal and edges to be the co-catalyst of graphitic carbon nitride (g-C 3 N 4 ) for ultrahigh solar-driven hydrogen production . VS 2 -decorated g-C 3 N 4 shows an impressing photocatalytic hydrogen evolution with a rate of 87.4 μmol/h, 26 times higher than pristine g-C 3 N 4 . Our combined experimental and computational studies reveal that the excellent efficiency of the composite is attributed to: (1) effective electron-hole separation and electron transfer from g-C 3 N 4 to VS 2 , resulting from the optimal band alignment between VS 2 and g-C 3 N 4 and metallic characteristic of VS 2 ; (2) fast hydrogen generation on the surface due to the high surface area and excellent HER activity of VS 2 . Our findings demonstrate that VS 2 /g-C 3 N 4 may be applicable in solar-driven water splitting, and the design principle can be applied to search for novel photocatalysts.