MoS2 Quantum Dots Modified Black Ti3+-TiO2/g-C3N4 Hollow Nanosphere Heterojunction toward Photocatalytic Hydrogen Production Enhancement

The MoS2 quantum dots (QDs) modified black Ti3+-TiO2/g-C3N4 hollow nanosphere heterojunction is synthesized via the continuous chemical template deposition and sculpture-reduction processes. The results of structural characterizations imply that the Ti3+-TiO2/g-C3N4/MoS2 QDs hollow nanosphere heterojunction is prepared successfully. The photocatalytic hydrogen evolution reaction (HER) of the B-TiO2/g-C3N4/MoS2 QDs (approximate to 1524.37 mu mol g(-1) h(-1)) exhibits an enhancement of approximate to 33 folds compared with the normal TiO2. Furthermore, the process of photocatalysis and the mechanism of photocatalytic HER enhancement are explored, which can be ascribed to the HER activity sites of MoS2 QDs, Ti3+/O-v ions in the Ti3+-TiO2, and hollow nanosphere heterojunction, which are proved by electrochemical measurements.