S-scheme heterojunction of ZnCdS nanospheres and dibenzothiophene modified graphite carbon nitride for enhanced H2 production

g-C3N4-based photocatalysts with an intramolecular donor-acceptor structure still suffer from inadequate visible-light absorption and severe charge recombination. Constructing S-scheme heterojunction is a promising approach to address these issues. Herein, ZCS (ZnCdS nanospheres)@DBTCN (g-C3N4 modified by dibenzothiophene groups) photocatalyst was synthesized through self-assembly approach. The [email protected] material showed superior photocatalytic H2 production activity of 8.87 mmol g–1 h–1, which 3.46 2.55 times that pure DBTCN ZCS, respectively. This enhanced performance could be ascribed the synergistic effect internal electric field heterojunction, boosts separation transport photogenerated carriers within molecular framework at interface, preserves maximum redox capacity spatially separated electrons holes. Moreover, migrate mechanism strongly evidenced in-situ irradiated Kelvin probe force microscopy X-ray photoelectron spectroscopy. study provides protocol for designing hybrid high efficiency excellent activity.