Isolated FeN4 Sites for Efficient Electrocatalytic CO2 Reduction

Abstract The construction of isolated metal sites represents a promising approach for electrocatalyst design toward the efficient electrochemical conversion of carbon dioxide (CO 2 ). Herein, Fe‐doped graphitic carbon nitride is rationally prepared by a simple adsorption method and is used as template to construct isolated FeN 4 sites through a confined pyrolysis strategy, which avoids the agglomeration of metal atoms to particles during the synthesis process and thus provides abundant active sites for the CO 2 reduction reaction. The isolated FeN 4 sites lower the energy barrier for the key intermediate in the CO 2 reduction process, leading to the enhanced selectivity for CO production with a faradaic efficiency of up to 93%.