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

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-C3N4/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 μmol g-1 h-1, which is 15.6 and 2.4 times as high as that of PCN (806 μmol g-1 h-1) and CS-D (5209 μmol 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.