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Tuning the hydrogen evolution performance of 2D tungsten disulfide by interfacial engineering

WC|WS2 composites with a sponge-like structure were constructed from nanolayers with the aid of NaCl as a template. Each nanolayer was composed of WC|WS2 interfaces by inducing carbon as the interstitial atoms. The local configuration around W atoms was probed by EXAFS. The catalytic activity of WC|WS2 composites for the hydrogen evolution reaction was thoroughly investigated by varying the ratio of WC|WS2. The sponge-like structures not only facilitate the transportation of the electrolyte, but also offer more edge active sites. The introduction of carbon provides W–C bonds, which accelerate the electron transportation and improve the stability of the catalyst in the hydrogen evolution reaction. The hybrid catalyst presents a low overpotential of 103 mV at 10 mA cm−2 and a Tafel slope of 58 mV Dec−1 and possesses great potential for low-cost and larger-scale production applied in catalysis.