“…39 Many factors influence the results of the photoinduced reduction of CO 2 , of which the photocatalyst, the reaction medium, the light source and the design of the photocatalytic reaction system are the most important. 40 Considerable effort for decades has been devoted to investigating the performance of CO 2 conversion by photocatalysts, and several strategies have been reported to strengthen the advantages of 2D materials and improve CO 2 conversion, including elemental doping, 8,41 heterojunction construction, 6,7,[42][43][44][45][46][47][48][49] molecule self-assembly, 50 surface modification, [51][52][53][54] nanostrucutralization, 2,16 and dimensionality reduction. 17,20,38,55,56 Although many studies have focused on structure or material modification, very few studies have been carried out on the selection of the appropriate reaction solvent or light source.…”