fig1

Figure 1. (A) The preparation process of Meso/Micro-FeNC; (B) SEM image of ZIF-L-Fe@micelle; (C) SEM and (D) TEM image of Meso/Micro-FeNC; (E) High resolution TEM image of Meso/Micro-FeNC (red circles: mesopores); (F) Aberration-corrected HAADF-STEM image of Meso/Micro-FeNC; (G) EDX elemental mapping of Meso/Micro-FeNC. Meso/Micro-FeNC: Meso/microporous Fe/N-codoped carbon; SEM: scanning electron microscopy; ZIF-L: zeolitic imidazolate framework-L; TEM: transmission electron microscopy; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; EDX: energy-dispersive X-ray spectroscopy.