Microwave-assisted synthesis of organic–inorganic hybrid porous g-C3N4/CdS–diethylenetriamine S-scheme heterojunctions with enhanced visible light hydrogen production

Abstract The activity of photocatalysts depends, to a large extent, on the separation of internal charge carriers, thereby enhancing the redox ability. S-scheme photocatalysts have shown good hydrogen-production performance, not only with good performance, but also with high reproducibility. In particular, two-dimensional (2D)/2D S-scheme heterojunction materials have attracted a great deal of attention because of the rapid charge separation and transfer rate between the interfaces. In this work, a porous g-C 3 N 4 /CdS–diethylenetriamine (PCN/CS–D) S-scheme heterojunction is designed and fabricated by a facile microwave method. The designed PCN/CS–D photocatalyst has a hydrogen-evolution rate of 12 547 μ mol g −1 h −1 , which is 15.6 and 2.4 times as high as that of PCN (806 μ mol g −1 h −1 ) and CS–D (5209 μ mol g −1 h −1 ), respectively. The combination of PCN and CS–D improves the separation of electron–hole pairs and the rate of charge transfer.