Anchoring of Formamidinium Lead Bromide Quantum Dots on TiC Nanosheets for Efficient Photocatalytic Reduction of CO.

Metal halide perovskite with a suitable energy band structure and excellent visible-light response is a prospective photocatalyst for CO reduction. However, the reported inorganic halide perovskites have undesirable catalytic performances due to phase-sensitive and severe charge carrier recombination. Herein, we anchor the FAPbBr quantum dots (QDs) on TiC nanosheets to form a FAPbBr/TiC composite within a Schottky heterojunction for photocatalytic CO reduction. Upon visible-light illumination, the FAPbBr/TiC composite photocatalyst exhibits an appealing photocatalytic performance in the presence of deionized water. The TiC nanosheet acts as an electron acceptor to promote the rapid separation of excitons and supply specific catalytic sites. An optimal electron consumption rate of 717.18 μmol/g·h is obtained by the FAPbBr/0.2-TiC composite, which has a 2.08-fold improvement over the pristine FAPbBr QDs (343.90 μmol/g·h). Meanwhile, the FAPbBr/TiC photocatalyst also displays a superior stability during photocatalytic reaction. This work expands a new insight and platform for designing superb perovskite/MXene-based photocatalysts for CO reduction.