Fig. 2: The electrocatalytic performance of the four M@Cu24 (M = Au/Cu) NCs in eCO2RR.

a, d CO, b, e formate and c, f H2 faradaic efficiency of AuCu24-(Ph)3P, Cu25-(Ph)3P, and Cu25-(p-FPh)3P, AuCu24-(p-FPh)3P, respectively. FEs for various eCO2RR products obtained on g AuCu24-(Ph)3P, Cu25-(Ph)3P, and h AuCu24-(p-FPh)3P, Cu25-(p-FPh)3P. The error bars represent the standard deviation of three tests at the same test potential.