One-step solvothermal synthesis of MoS_2/TiO_2 nanocomposites with enhanced photocatalytic H_2 production

摘要

The present communication reports on a facile one-step solvothermal synthesis of highly crystallized MoS_2/TiO_2 nanocomposites for the first time. The TEMimage shows the generation of a large amount of TiO_2 nanoparticles with diameters in the range of 5–8 nm. The photocurrent measurement suggests that loading a certain amount of MoS_2 can effectively improve separation of photogenerated carries. Cyclic voltammograms measurements reveal that TiO_2 modified with 1.0 wt% MoS_2 can reduce hydrogen reduction overpotential, thereby leading to enhanced photocatalytic activity. Photocatalytic H_2 evolution test suggests that 1.0 wt% MoS_2/TiO_2 nanocomposites show superior photocatalytic activity, and the H_2 production rate achieves 119.5 lmol h~(-1) g~(-1) and is about 19 times higher than that of TiO_2 alone, which could be attributed to the short diffusion distance in TiO_2 nanoparticles, efficient interfacial electron transfer from TiO_2 nanoparticles to MoS_2 surface, and reduced hydrogen reduction overpotential. Furthermore, the MoS_2/TiO_2 photocatalysts are stabile during the photocatalytic H_2 evolution test.