In Situ Preparation of Mn0.2Cd0.8S‐Diethylenetriamine/Porous g‐C3N4 S‐Scheme Heterojunction with Enhanced Photocatalytic Hydrogen Production

Abstract The design of a step‐scheme (S‐scheme) heterojunction can promote the separation of photogenerated carriers and optimize the oxidation–reduction capacity of the photocatalyst to the greatest possible extent. It is one of the most effective schemes for enhancing the efficiency of photocatalytic hydrogen production. In this work, an S‐scheme of Mn 0.2 Cd 0.8 S‐diethylenetriamine/porous g‐C 3 N 4 (MCS/PCN) heterojunction is designed, which accelerates the charge transfer at the interface of Mn 0.2 Cd 0.8 S‐diethylenetriamine (Mn 0.2 Cd 0.8 S‐DETA) and porous g‐C 3 N 4 (Pg‐C 3 N 4 ), and provides electrons for photocatalytic hydrogen production. Under the same light conditions, the hydrogen production efficiency of the MCS/PCN composite is 11.42 mmol h ‐1 g ‐1 , which is 30 times higher than that of pure Pg‐C 3 N 4 . By constructing this in situ grown S‐scheme heterojunction, a new direction for the precise design of charge separation is provided.