All-Solid-State Z-Scheme α-Fe2O3/Amine-RGO/CsPbBr3 Hybrids for Visible-Light-Driven Photocatalytic CO2 Reduction

Summary

Lead halide perovskite (PVK) has been deemed as a promising photocatalyst alternative because of its remarkable photoelectrical properties; however, the severe charge recombination has limited its catalytic activity. Herein, we report a PVK-based Z-scheme heterojunction, α-Fe₂O₃/Amine-RGO/CsPbBr₃, for high-efficiency CO₂ reduction in the presence of H₂O. By delicately controlling the interfacial interaction, effective Z-scheme electron transfer from α-Fe₂O₃ to CsPbBr₃ is built, leading to boosted charge separation and prolonged carrier lifetime, as confirmed by electron spin resonance (ESR), transient absorption (TA) spectra, etc. The impactful spatial separation of photo-generated carriers in Z-scheme system finally enables an 8.3-fold enhancement in photocatalytic performance as compared to CsPbBr₃. A stable product yield of 469.16 μmol g⁻¹ and an electron consumption yield of 3,132.46 μmol g⁻¹ are achieved. This work is expected to provide deep insights into boosting the photocatalytic performance of PVK by modulating the charge carrier dynamics.