Eosin Y‐Functionalized Conjugated Organic Polymers for Visible‐Light‐Driven CO 2 Reduction with H 2 O to CO with High Efficiency

Visible‐light‐driven photoreduction of CO 2 to energy‐rich chemicals in the presence of H 2 O without any sacrifice reagent is of significance, but challenging. Herein, Eosin Y‐functionalized porous polymers (PEosinY‐N, N=1–3), with high surface areas up to 610 m 2 g −1 , are reported. They exhibit high activity for the photocatalytic reduction of CO 2 to CO in the presence of gaseous H 2 O, without any photosensitizer or sacrifice reagent, and under visible‐light irradiation. Especially, PEosinY‐1 derived from coupling of Eosin Y with 1,4‐diethynylbenzene shows the best performance for the CO 2 photoreduction, affording CO as the sole carbonaceous product with a production rate of 33 μmol g −1 h −1 and a selectivity of 92 %. This work provides new insight for designing and fabricating photocatalytically active polymers with high efficiency for solar‐energy conversion.