Layered Confinement Reaction: Atomic‐level Dispersed Iron–Nitrogen Co‐Doped Ultrathin Carbon Nanosheets for CO2 Electroreduction

Abstract High electrochemical over‐potential and low product selectivity are regarded as the main limitations of electroreduction of CO 2 . Here, we proposed a new strategy to synthesize metal porphyrin‐hybridized porous and ultra‐thin carbon nanosheets (MPPCN) by the confinement function of the layered template. The layered confinement reaction protects the coordination structure of metal and nitrogen atoms during subsequent high‐temperature treatment while ensuring the formation of ultra‐thin structures. This method effectively prevents the aggregation of metal atoms, so that the metal atoms exhibit a dispersed state of a single atomic level. MPPCN exhibit unexpected catalytic activity for electroreduction of CO 2 , and the catalytic reaction can be carried out at an over‐potential of 0.39 V. The faradaic efficiency of CO can reach 95.9 % at the potential of −0.7 V versus the reversible hydrogen electrode.