Fig. 1: Synthesis of Fe₁CNCl.

a Synthesis scheme of Fe₁CNCl. b TEM and c HAADF-STEM images of Fe₁CNCl and d the corresponding EDS mappings of C, N, Fe and Cl (The scale bar is 100 nm). e Fe K-edge WT-EXAFS plots of Fe foil and Fe₁CNCl. f FT-EXAFS analysis of Fe₁CNCl in R space.