Covalent Organic Framework Hosting Metalloporphyrin-Based Carbon Dots for Visible-Light-Driven Selective CO2Reduction

The visible-light-driven photocatalytic CO(2)reduction is one appealing approach to simultaneously mitigate the energy crisis and environmental issues. It is highly desirable but challenging to selectively and efficiently convert CO(2)into desirable products. Herein, a covalent organic framework hosting metalloporphyrin-based carbon dots (M-PCD@TD-COF, M = Ni, Co, and Fe) is first presented, which serves as heterogeneous catalysts for CO(2)photoreduction. M-PCD@TD-COF not only enriches available COF-based catalytic materials, but also provides suitable environment for CO(2)adsorption and activation on metalloporphyrin-based carbon dots. The advantages of the host environment in COFs are highlighted by the satisfactory catalytic activity and remarkable selectivity of CO2-to-CO conversion over H(2)generation up to 98%. The photocatalytic system is effective for both pure CO(2)and the simulated flue gas. This work provides new protocols for the rational design of COF-based heterogeneous catalysts for selective CO(2)photoreduction.