Interfacial Linkage Engineering Inducted Directional Electron Transfer Over ZnIn ₂ S ₄ @BiOCl S‐Scheme Heterojunctions for CO ₂ Photoreduction and Tetracycline Decomposition

Abstract

Abstract The rational design of ZnIn 2 S 4 @BiOCl (ZIS@BiOCl) S‐scheme heterojunctions through interfacial In─O linkage creates smooth directional carrier channels, significantly enhancing charge transfer and separation. Density functional theory (DFT) simulations and experimental characterizations confirm that the strong built‐in electric field and interfacial In─O coupling synergistically promote charge migration. The optimized 3% ZIS@BiOCl composite demonstrates exceptional photocatalytic activity, achieving CO and CH 4 production rates of 1132.63 and 17.47 µmol g −1 h −1 , respectively, along with an 83.1% tetracycline (TC) degradation efficiency. In situ FTIR spectroscopy reveals the CO 2 reduction pathway to CO/CH 4 , while LC‐MS analysis identifies TC degradation intermediates. This work provides atomic‐level insights for designing efficient S‐scheme photocatalysts for simultaneous CO 2 reduction and pollutant degradation.