Regulating CO and H 2 Ratios in Syngas Produced from Photocatalytic CO 2 /H 2 O Reduction by Cu and Co Dual Active Centers on Carbon Nitride Hollow Nanospheres.

For photocatalytic CO 2 reduction to produce syngas, there are challenges in achieving a high catalytic efficiency and precise control over the product ratio. In this study, two non-noble metal complexes Cobpy and Cubpy (bpy = 2,2'-bipyridine) as cocatalysts for CO 2 reduction and hydrogen evolution, respectively, were in situ supported on carbon nitride hollow nanospheres to construct a hybrid system for photocatalytic syngas production. The resulting CO/H 2 ratio can be precisely regulated within a wide range of 0:1-9:1 by accurately controlling the content of the two complexes. The presence of the two complexes promotes the migration of photogenerated electrons of the carbon nitride. CO 2 can be reduced to CO on the photoreduced species Co(bpy) 2 + of Cobpy on CNHS, and H + can be reduced to H 2 on the photoreduced species Cu(bpy) 2 + of Cubpy . Furthermore, this method is also applicable to other photocatalysts, such as CdS and TiO 2 for generating syngas and regulating product ratios.