S-Scheme Heterojunction Efficient Extraction of Hot Carriers in CsPbBr3/Bi4O5I2 for Enhanced Photocatalytic H2 Evolution and CO2 Reduction

This study investigates the photocatalytic capabilities of an S-scheme heterojunction formed by CsPbBr3 and Bi4O5I2 for H-2 evolution and CO2 reduction. The heterojunction is designed to enhance the extraction of hot carriers and charge separation through interface engineering and an internal electric field. The initial T-c at higher pumping intensities indicates that CsPbBr3 carriers injected into Bi4O5I2 at higher energies and temperatures cooled from 1800 to 800 K within 200 fs after photoexcitation. Compared with CsPbBr3, CsPbBr3/Bi4O5I2 showed substantial improvement in photocatalytic H-2 production from 59.08 to 1050.93 mu mol h(-1) g(-1). Furthermore, the S-scheme CsPbBr3/Bi4O5I2 heterojunction displays outstanding photocatalytic CO2 to CO performance, compared to pure CsPbBr3, from 2.84 to 83.6 mu mol h(-1) g(-1). These findings contribute to the understanding and development of S-scheme heterojunction extraction of hot carriers in perovskite materials for photocatalytic applications.