▎ 摘　　要

This work presents an effective way of enhancing MoS2-mediated electrocatalytic hydrogen evolution, by exploiting the synergistic effect of reduced graphene oxide (rGO) and near-infrared (NIR) light. Various rGOMoS2 composites were obtained via hydrothermal method. The optimized composite, 0.2rGO-MoS2 exhibited enhanced electrocatalytic hydrogen evolution activity in a wide pH range under NIR irradiation, without adding noble metal. The overpotentials of 0.2rGO-MoS2 at 10 mA cm-2 in acidic and alkaline media were 146 and 314 mV, respectively. The corresponding Tafel slopes in acidic and alkaline media were 51 and 80 mV dec-1, respectively. In both media, the electrocatalytic hydrogen evolution by 0.2rGO-MoS2 under NIR irradiation was attributed to the Volmer-Heyrovsky mechanism. 0.2rGO-MoS2 also had a good reproducibility and durability under NIR light irradiation after 5000 cycles and 24 h of continuous electrolysis in both media. Furthermore, the roles of rGO and NIR irradiation in the electrocatalytic hydrogen evolution by MoS2 were investigated.