The construction of a MAPbBr3/La2Ti2O7 organic–inorganic dual perovskite heterojunction for photocatalytic CO2 reduction

Abstract

Considering the wide band gap of La₂Ti₂O₇, and the limited separation efficiency of charge carriers in MAPbBr₃, we designed and easily fabricated a MAPbBr₃/La₂Ti₂O₇ dual perovskite heterojunction with similar crystal structures for efficient photocatalytic CO₂ reduction. Owing to the improved visible light absorption capacity, separation efficiency of the photogenerated electron–hole pairs, and similar spatial crystal structure, the optimal MAPbBr₃/La₂Ti₂O₇ dual perovskite heterojunction exhibited significantly enhanced photocatalytic activity for CO production at a rate of 18.9 μmol g⁻¹, which was 4.3 times greater than that of the original MAPbBr₃.