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.