▎ 摘　　要

Herein, a three-dimensional network hetero-structure comprising 1T-phase dominated MoSx nanosheets vertically grown on nitrogen-doped reduced graphene oxide (MoSx/N-rGO) was constructed through a surfactant-free hydrothermal route and applied to hydrogen evolution reaction (HER). We demonstrate that N species in graphene lattices play a vital role for the interface coupling between MoSx and N-rGO via Mo-N bonds, thereby promoting the 2H-to-1T phase transition of MoSx. By adjusting N-rGO content, the 1T-phase concentration of MoSx can reach 81.7% and the corresponding surface structure is optimized. The excellent synergistic effect dependent on robust hetero-interface can increase basal plane/edge active sites and accelerate electron/proton reaction kinetics. Consequently, MoSx/N-rGO exhibits enhanced HER activity with a low onset potential of 100 mV, notably small Tafel slope of 38 mV dec(-1) and excellent cycling stability.