LAUSR

Abstract Developing the stable and efficient hydrogen evolution reaction (HER) electrocatalyst is greatly desirable for the production of hydrogen as a clean energy resource. Herein, we report a simple and effective approach to fabricate MoS 2 /S-doped g-C 3 N 4 layered heterojunction electrocatalysts, which can adjust the electron structure, enhance the charge transfer rate and expose more active sites of MoS 2 for HER. The optimized MoS 2 -C 3 N 4 -60 sample shows a small onset overpotential as low as 115 mV, a low overpotential of 173 mV to achieve current density of 10 mA/cm 2 , a low Tafel slope of 53 mV decade −1 , and a high turnover frequency of 0.16 H 2  s −1 per active site at η = 150 mV. This finding proposes a new strategy to fabricate 2D layered heterojunction for enhancing HER performance by rationally coupling two similar layered materials.