MoS2/SnNb2O6 2D/2D nanosheet heterojunctions with enhanced interfacial charge separation for boosting photocatalytic hydrogen evolution.

Semiconductor-based photocatalytic hydrogen evolution through water splitting is of great importance for tacking the ever-increasing energy concerns. Here, novel visible-light-driven MoS2/SnNb2O6 2D/2D nanosheet heterojunction for photocatalytic hydrogen evolution was designed and fabricated by a facile hydrothermal method. The as-prepared 2D/2D heterojunctions not only offer extended visible light absorption range but also accelerate the separation and transfer efficiency of charge carriers owing to the typical 2D interface. Therefore, the MoS2/SnNb2O6 2D/2D heterojunctions showed superior H2 evolution photocatalytic performance compared with bare MoS2 and SnNb2O6 nanosheet. The optimal H2 production rate of as-prepared MoS2/SnNb2O6 heterojunction was up to 4.3-fold and 5-fold as high as that of bare SnNb2O6 and MoS2. This works will provide a new perspective on the development of 2D/2D nanosheet heterojunction photocatalysts with high performance for water splitting.