2D Atomic Layers for CO 2 Photoreduction.

Artificial photosynthesis can convert carbon dioxide into high value-added chemicals. However, due to the poor charge separation efficiency and CO 2 activation ability, the conversion efficiency of photocatalytic CO 2 reduction is greatly restricted. Ultrathin 2D photocatalyst emerges as an alternative to realize the higher CO 2 reduction performance. In this review, the basic principle of CO 2 photoreduction is introduced, and the types, advantages, and advances of 2D photocatalysts are reviewed in detail including metal oxides, metal chalcogenides, bismuth-based materials, MXene, metal-organic framework, and metal-free materials. Subsequently, the tactics for improving the performance of 2D photocatalysts are introduced in detail via the surface atomic configuration and electronic state tuning such as component tuning, crystal facet control, defect engineering, element doping, cocatalyst modification, polarization, and strain engineering. Finally, the concluding remarks and future development of 2D photocatalysts in CO 2 reduction are prospected.