Coupling CsPbBr3 Quantum Dots with Covalent Triazine Frameworks for Visible‐Light‐Driven CO2 Reduction

Abstract Photocatalytic reduction of CO 2 into value‐added chemical fuels is an appealing approach to address energy crisis and global warming. CsPbBr 3 quantum dots (QDs) are good candidates for CO 2 reduction because of their excellent photoelectric properties, including high molar extinction coefficient, low exciton binding energy, and defect tolerance. However, the pristine CsPbBr 3 QDs generally have low photocatalytic performance mainly due to dominant charge recombination and lack of efficient catalytic sites for CO 2 adsorption/activation. Herein, we report a new photocatalytic system, in which CsPbBr 3 QDs are coupled with covalent triazine frameworks (CTFs) for visible‐light‐driven CO 2 reduction. In this hybrid photocatalytic system, the robust triazine rings and periodical pore structures of CTFs promote the charge separation in CsPbBr 3 and endow them with strong CO 2 adsorption/activation capacity. The resulting photocatalytic system exhibits excellent photocatalytic activity towards CO 2 reduction. This work presents a new photocatalytic system based on CTFs and perovskite QDs for visible‐light‐driven CO 2 reduction, which highlights the potential of perovskite‐based photocatalysts for solar fuel applications.