▎ 摘　　要

Highly selective CO(2)electroreduction to CO (similar to 90% faradaic efficiency) was achieved on NiCu(0.25)bimetallic nanoparticle catalysts. By combining Synchrotron based X-ray absorption andin situRaman spectroscopy studies, we found that there is a negative correlation between the Cu content in NiCu(x)and CO selectivity due to redistribution of the 3d electrons.