0D/2D Van Der Waals Heterojunction of N,S-Organic Dots/g-C3N4 Nanosheets for Boosted Photocatalytic Hydrogen Evolution

Using solar energy to efficiently decompose water to produce hydrogen under visible light is a kind of promising green energy. A great number of hybrid materials have been developed as catalysts for photolysis of water to hydrogen. However, these photocatalysts are still limited by fast electron–hole recombination or their low quantum efficiency. In this study, novel N,S-organic dots (NSOD) were combined with g-C3N4 (CN) by ultrasonic self-assembly to form a new NSOD/CN van der Waals heterojunction photocatalyst. Photocatalytic hydrogen production of the NSOD/CN van der Waals heterojunction reached 1369.5 μmol h–1 g–1, and the efficiency is 4.25 times higher than CN. The improvement in performance is due to the formation of the van der Waals heterojunction between NSOD and CN, which effectively promotes charge separation and electron transfer. Meanwhile, the introduction of NSOD is beneficial for the visible light response of the photocatalyst. This paper reports an effective reference to construct a novel van der Waals heterojunction for applications in the field of energy conversion.