Tandem catalysts CuSe/AuX for increasing local*CO concentration to promote the photocatalytic CO_(2) reduction to C_(2)H_(4)

It is highly desired yet challenging to strategically steer CO_(2) reduction reaction(CO_(2)RR)toward ethylene(C_(2)H_(4)) with high activity under visible light irradiation.The key to achieving this goal is increasing the local*CO concentration on the catalyst surface and promoting the C-C coupling progress.Here,we prepare tandem catalysts of CuSe/AuX to realize the photocatalytic reduction of CO_(2) to C_(2)H_(4) with high activity.Under light irradiation,the loaded Au NPs are used to activate and transfer CO_(2) to *CO.The generated*CO intermediate could migrate to the surface of CuSe and cause the C-C coupling process.Moreover,the theoretical calculation results show that the transport process of*CO from Au NPs to CuSe is spontaneous,which plays a critical role in guaranteeing the high concentration of *CO intermediate on the surface of CuSe.This work not only reveals the effect of tandem catalysis on CO_(2)RR to C2 products but also explores the most suitable tandem catalyst to produce C_(2)H_(4) with high activity by adjusting the loading amounts of Au NPs.Thus,it provides a way to adjust the Cu-based catalyst used in the production of C2 products by photocatalytic CO_(2)RR,which may attract extensive attention in the field.