A review on modification of facet-engineered TiO^sub 2^ for photocatalytic CO^sub 2^ reduction

Energy shortages and global warming are two main problems the world is currently facing. Photocatalytic CO2 reduction is one of the most promising solutions to the above issues. Among the various photocatalysts, faceted TiO2 crystals have attracted wide attention due to their excellent photocatalytic performance for CO2 reduction. This review encompasses the recent advances in the application of facet-engineered TiO2-based catalysts for CO2 photocatalytic reduction. The review begins with the fundamentals of CO2 photocatalytic reduction over TiO2. In the following section, we discuss the surface atom structure and electronic structure of faceted TiO2 crystals and the related the CO2/water adsorption and charge transfer/separation properties. Then, we outline the modification strategies for faceted TiO2 and their influence on the CO2 photocatalytic reduction performance. Finally, a summary and the future perspectives of facet-engineered TiO2 photocatalysts for CO2 photoreduction are presented.