Enhancing CO electroreduction to CH over Cu nanoparticles supported on N-doped carbon.

The electroreduction of CO to CH has attracted extensive attention. However, it is still a challenge to achieve high current density and faradaic efficiency (FE) for producing CH because the reaction involves eight electrons and four protons. In this work, we designed Cu nanoparticles supported on N-doped carbon (Cu-np/NC). It was found that the catalyst exhibited outstanding performance for the electroreduction of CO to CH. The FE toward CH could be as high as 73.4% with a high current density of 320 mA cm. In addition, the mass activity could reach up to 6.4 A mg . Both experimental and theoretical calculations illustrated that the pyrrolic N in NC could accelerate the hydrogenation of *CO to the *CHO intermediate, resulting in high current density and excellent selectivity for CH. This work conducted the first exploration of the effect of N-doped species in composites on the electrocatalytic performance of CO reduction.