Atomically dispersed Fe-N-C catalyst displaying ultra-high stability and recyclability for efficient electroreduction of CO 2 to CO.

To avoid the agglomeration of iron NPs and improve the dispersion of Fe SAs, we employed a mixed-ligand strategy to regulate the iron content in PCN-224(Zn x Fe y ) and PCN-222(Zn x Fe y ). Thanks to the sublimation of Zn and the Kirkendall effect, uniform dispersions of Fe SAs with 1.04-1.06 wt% were obtained in the pyrolysis products Zn 0.5 Fe 0.5 -N-C-224 and Zn 0.5 Fe 0.5 -N-C-222 with excellent CO 2 → CO activity, super-stability, and recyclability.