Recent advances on bismuth oxyhalides for photocatalytic CO2 reduction.

Photocatalytic conversion of CO 2 into fuels such as CO, CH 4 , and CH 3 OH, is a promising approach for achieving carbon neutrality. Bismuth oxyhalides (BiOX, where X = Cl, Br, and I) are appropriate photocatalysts for this purpose due to the merits of visible-light-active, efficient charge separation, and easy-to-modify crystal structure and surface properties. For practical applications, multiple strategies have been proposed to develop high-efficiency BiOX-based photocatalysts. This review summarizes the development of different approaches to prepare BiOX-based photocatalysts for efficient CO 2 reduction. In the review, the fundamentals of photocatalytic CO 2 reduction are introduced. Then, several widely used modification methods for BiOX photocatalysts are systematacially discussed, including heterojunction construction, introducing oxygen vacancies (OVs), Bi-enrichment, heteroatom-doping, and morphology design. Finally, the challenges and prospects in the design of future BiOX-based photocatalysis for efficient CO 2 reduction are examined. [Display omitted] [ABSTRACT FROM AUTHOR]