Photocatalytic synthesis of carbamo(dithioperoxo)thioates via Z-scheme H2WO4/CsPbBr3 heterojunction

Abstract

A rationally designed Z-scheme heterojunction photocatalyst based on H2WO4 and CsPbBr3 has been developed for the mild and efficient photocatalytic synthesis of carbamo(dithioperoxo)thioates. By facilitating spatial separation and migration of photogenerated carriers, this heterogeneous catalyst drives the three-component coupling of readily accessible thiols, amines, and CS2 at ambient temperature, using air as the sustainable oxidant and entirely avoiding stoichiometric chemical oxidants. The enhanced photocatalytic performance stems from the efficient charge separation and migration enabled by H2WO4 nanosheets, which suppress charge recombination and promote the generation of reactive oxygen species (·O2 -). This work elucidates the critical role of the oxidation photocatalyst in advancing perovskite-based heterojunctions and provides a feasible design strategy toward efficient light-harvesting systems.