Background and Originality Content
Electrocatalytic CO2RR affords a promising route to address the current environmental and energy issues by converting CO2 into carbon-based fuels[1, 2]. Among the different electrochemical CO2RR products, CO is regarded as one of the most promising industrial targets due to its high energy efficiency[3, 4]. Tremendous efforts have been devoted to developing efficient electrocatalysts with high activity and selectivity to favor CO production[5, 6]. Recently, single-atom catalysts have aroused increasing interests owing to their high atomic utilization efficiency and tunable coordination structure[7, 8]. Metal-nitrogen-carbon catalysts as one of the most typical SACs have attracted extensive attention for the CO2RR to produce CO[9, 10]. However, M-N-C catalysts usually exhibit poor CO2RR performance without further modification. Therefore, developing effective M-N-C catalysts for highly active CO2RR remains challenging yet urgent.