Interfacial Chemical Bond–Enhanced Charge Polarization in CoTCPP/Bi12O17Br2‐Triggering Efficient CO2 Photoreduction

Photocatalytic CO 2 reduction is a prospective pathway to solve energy and environmental problems. Slow charge migration and insufficient active sites are pivotal obstacles to inhibit efficient photocatalytic CO 2 reduction. Herein, cobalt–tetrakis(4‐carboxyphenyl)porphyrin (CoTCPP)/Bi 12 O 17 Br 2 photocatalysts are successfully assembled by interfacial bridge Bi–O bonds between CoTCPP and Bi 12 O 17 Br 2 . The rearranged strong coupling interface in CoTCPP/Bi 12 O 17 Br 2 enhances carrier polarization, allowing photoelectrons to directionally transfer and to aggregate at Co atoms. This polarization strategy facilitates rapid charge transportation and efficient CO 2 activation, resulting in an improvement in CO 2 photoreduction ability. After 5 h irradiation, the 0.2 wt% CoTCPP/Bi 12 O 17 Br 2 exhibits a significantly enhanced photocatalytic CO 2 reduction with a CO yield of 369.55 μmol g −1 (3.73 times that of Bi 12 O 17 Br 2 ), achieving 100% product selectivity. In this work, an insight is provided for constructing efficient charge‐transfer structure through interfacial polarization strategy.