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 CsPbBr 3 and Bi 4 O 5 I 2 for H 2 evolution and CO 2 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 CsPbBr 3 carriers injected into Bi 4 O 5 I 2 at higher energies and temperatures cooled from 1800 to 800 K within 200 fs after photoexcitation. Compared with CsPbBr 3, CsPbBr 3 /Bi 4 O 5 I 2 showed substantial improvement in photocatalytic H 2 production from 59.08 to 1050.93 μmol h –1 g –1 . Furthermore, the S-scheme CsPbBr 3 /Bi 4 O 5 I 2 heterojunction displays outstanding photocatalytic CO 2 to CO performance, compared to pure CsPbBr 3, from 2.84 to 83.6 μmol 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.