Construction of two-dimensional zinc indium sulfide/bismuth titanate nanoplate with S-scheme heterojunction for enhanced photocatalytic hydrogen evolution.

Improving the separation efficiency of photogenerated carriers plays an important role in photocatalysis. In this study, two-dimensional (2D)/2D zinc indium sulfide (ZnInS)/bismuth titanate (BiTiO) nanoplate heterojunctions were synthesized to alter the BiTiO morphology, modulate the bandgap of BiTiO, and enhance the utilization of light. Meanwhile, the construction of the S-scheme heterojunction establishes an internal electric field at the ZnInS/BiTiO heterojunctions interface and achieves the spatial separation of photogenerated charges. The hydrogen production rate of ZnInS/BiTiO nanoplate with the optimal ratio reaches 27.50 mmol h g, which is 1.5 times higher than that of ZnInS/BiTiO nanoflower (18.28 mmol h g) and 2.4 times higher than that of ZnInS (11.69 mmol h g). The apparent quantum efficiency of ZnInS/BiTiO nanoplate reached 57.9 % under a single wavelength of light at 370 nm. This work provides insights into the study of new materials for photocatalytic hydrogen production.