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The MoS 2 quantum dots (QDs) modified black Ti 3þ -TiO 2 /g-C 3 N 4 hollow nanosphere heterojunction is synthesized via the continuous chemical template deposition and sculpture-reduction processes. The results of structural characterizations imply that the Ti 3þ -TiO 2 /g-C 3 N 4 /MoS 2 QDs hollow nanosphere heterojunction is prepared successfully. The photocatalytic hydrogen evolution reaction (HER) of the B-TiO 2 /g-C 3 N 4 /MoS 2 QDs (%1524.37 μmol g À1 h À1 ) exhibits an enhancement of %33 folds compared with the normal TiO 2 . Furthermore, the process of photocatalysis and the mechanism of photocatalytic HER enhancement are explored, which can be ascribed to the HER activity sites of MoS 2 QDs, Ti 3þ /O v ions in the Ti 3þ -TiO 2 , and hollow nanosphere heterojunction, which are proved by electrochemical measurements.

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