1,3,5‐Triphenylbenzene Based Porous Conjugated Polymers for Highly Efficient Photoreduction of Low‐Concentration CO2 in the Gas‐Phase System

Herein, three 1,3,5‐triphenylbenzene based porous conjugated polymers (PCPs) are designed for photochemical reduction of CO 2 in simulated flue gas in the mild gas−solid reaction system. By tuning the nature of the comonomers, the PCPs present high surface areas, high CO 2 /N 2 selectivity, and broad visible light absorptions with bandgaps of 1.81−2.07 eV. At 1 bar and 273 K, the CO 2 uptake capacity of PCPs is enhanced from 1.28 to 2.18 mmol g −1 , with an increase in CO 2 adsorption heat from 21.8 to 28.3 KJ mol −1 . In the presence of gaseous water, SO‐TPB demonstrates the highest CO production rate of 40.12 μmol h −1 g −1 and nearly 100% product selectivity without using organic sacrificial reagent and additional cocatalyst (>420 nm). Moreover, SO‐TPB can be recovered while well retaining the photocatalytic activity and reused at least five runs, indicating good recyclability.