▎ 摘　　要

Sn4P3/reduced graphene oxide nanocomposites exhibited high selectivity for CO over a wide potential range from -2.2 V to -2.5 Vvs.Ag/Ag+. The maximum faradaic efficiency for CO can reach 96.6% with a high current density of 68.0 mA cm(-2). The high efficiency and selectivity can be attributed to the modified electronic structure of Sn sites, the small Sn4P3 nanoparticles and their dense packing in a conductive matrix, leading to a high density of active sites for adsorbing CO2 and stabilizing the CO(2)(-)(center dot-)intermediate.