Anchoring of Formamidinium Lead Bromide Quantum Dots on Ti3C2 Nanosheets for Efficient Photocatalytic Reduction of CO2

Metal halide perovskite with a suitable energy band structure and excellent visible-light response is a prospective photocatalyst for CO2 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(3) quantum dots (QDs) on Ti3C2 nanosheets to form a FAPbBr(3)/Ti3C2 composite within a Schottky heterojunction for photocatalytic CO2 reduction. Upon visible-light illumination, the FAPbBr(3)/Ti3C2 composite photocatalyst exhibits an appealing photocatalytic performance in the presence of deionized water. The Ti3C2 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 mu mol/g.h is obtained by the Br-3/0.2-Ti(3)C(2 )composite, which has a 2.08-fold improvement over the pristine FAPbBr(3) QDs (343.90 mu mol/g.h). Meanwhile, the FAPbBr(3)/Ti3C2 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 CO2 reduction.

Automated summary

In this study, FAPbBr(3) quantum dots were anchored on Ti3C2 nanosheets to form a FAPbBr(3)/Ti3C2 composite photocatalyst, exhibiting excellent photocatalytic performance under visible-light illumination. The Ti3C2 nanosheet acts as an electron acceptor to promote rapid separation of excitons and provide specific catalytic sites, showing potential as a photocatalyst for CO2 reduction.