Ipolymer Cd3(C3N3S3)2/Zn3(C3N3S3)2 S-scheme heterojunction enhances photocatalytic H2 production

Abstract

The preparation of S-scheme heterojunctions has attracted considerable attention in the academic community as a highly effective approach to enhance the separation and migration of electrons and holes, thereby significantly improving the catalytic efficiency of photocatalysts. In this work, a novel S-scheme ipolymer heterojunction photocatalyst, Cd3(C3N3S3)2/Zn3(C3N3S3)2 (CdTMT/ZnTMT), which synergy with π-conjugate system, was synthesized using an innovative in-situ hydrothermal method. Through a series of rigorous characterization tests, the formation of an S-scheme heterojunction between CdTMT and ZnTMT was confirmed. Particular emphasis is placed on the effective enhancement of photocatalytic activity of photocatalysts through π-conjugated orbitals and built-in electric field after combining double-organic conjugated polymer-shaped ZnTMT and CdTMT. Performance tests that show the photocatalytic hydrogen evolution performance of the composite was significantly boosted to an impressive 45.24 mmol∙g−1∙h−1, which is 215.43 times that of single catalyst ZnTMT and 1.76 times that of CdTMT. Finally, this paper discusses the possibility and development prospect of double polymer to construct S-scheme heterojunctions to improve the activity of photocatalysts.