Recent advances, modification strategies and perspectives of Bi2WO6 in photocatalytic CO2 reduction reaction

With the development of the global economy and the continuous consumption of fossil energy, a large amount of greenhouse gas CO₂ has been emitted into the atmosphere. Therefore, how to reduce the concentration of CO₂ in the atmosphere and convert it into high value-added products has gradually become a hot spot in scientific research. Photocatalytic CO₂ reduction technology can combine semiconductor with solar energy to convert CO₂ into high value-added organic carbon source through photocatalysis, which is of great significance for the effective utilization of solar energy and the emission reduction of CO₂. After decades of exploration, many effective photocatalysts have been discovered. Among them, Bi₂WO₆ with visible light absorption ability, as a new-type bismuth-based catalyst, has been widely studied due to its unique two-dimensional layered structure, stability, low cost and non-toxicity, et al. In this review, recent Advances of Bi₂WO₆ in photocatalytic CO₂ reduction reaction are summarized, including reaction mechanism, product selective regulation, In-situ Fourier transform infrared spectra application, density functional theory calculation, and various modification strategies. Finally, based on the in-depth understanding of the above advances, the future modification strategies and design ideas of Bi₂WO₆ in the field of photocatalytic CO₂ research are proposed. This has important practical significance for the latter design and development of Bi₂WO₆-based composite photocatalysts with high CO₂ conversion performance.