Interfacial construction of P25/Bi 2 WO 6 composites for selective CO 2 photoreduction to CO in gas-solid reactions.

Photocatalysis provides an attractive approach to convert CO 2 into valuable fuels, which relies on a well-designed photocatalyst with good selectivity and high CO 2 reduction ability. Herein, a series of P25/Bi 2 WO 6 nanocomposites were synthesized by a simple one-step in situ hydrothermal method. The formation of a heterojunction between Bi 2 WO 6 , which absorbs visible light, and P25, which absorbs ultraviolet light, expands the utilization of sunlight by the catalysts, and consequently, leads to a remarkably enhanced CO 2 selective photoreduction to CO. The maximum CO yield of the P25/Bi 2 WO 6 heterojunction under simulated solar irradiation was 15.815 μmol g -1 h -1 , which was 4.04 and 2.80 times higher than that of pure P25 and Bi 2 WO 6 , respectively. Our investigations verified a Z-scheme charge migration mechanism based on various characterization techniques between P25 and Bi 2 WO 6 . Furthermore, in situ DRIFTS uncovered the related reaction intermediates and CO 2 photoreduction mechanism. Our work sheds light on investigating the efficacious construction of Bi 2 WO 6 -based hybrids for light-driven photocatalysis.