MoS2 nanosheets on C3N4 realizing improved electrochemical hydrogen evolution.

Improving the electrochemical hydrogen evolution reaction (HER) activity of inexpensive catalysts is central in the area of sustainable energy conversion, yet remains an extraordinary challenge. Here, we firstly construct MoS 2 nanosheets vertically anchored on C 3 N 4 for high-efficiency electrochemical HER. The rational structure design endows MoS 2 nanosheets with combined advantages of maximally exposed edges and defect-rich structure. Moreover, the hybrid MoS 2 -C 3 N 4 possesses remarkably improved electrochemically active surface area and enhanced electrical conductivity than MoS 2 . Therefore, MoS 2 -C 3 N 4 exhibits robust electrocatalytic HER activity, including low overpotential (158 mV) required to generate the current density of 10 mA cm −2 , low Tafel slope (52 mV decade −1 ), and high current density (92 mA cm −2 at overpotential of 300 mV). [ABSTRACT FROM AUTHOR]