fig10

Figure 10. (A) HAADF-STEM of FeSe/NC; (B) HRTEM of FeSe/NC; (C) HAADF-STEM of FeSe/NC; (D) EDS mapping images of FeSe/NC; (A-D) are quoted with permission from Wang et al.^[187]; (E) HRTEM image of Fe₂N₆-S (insert was SAED pattern with selective area); (F and G) HAADF-STEM images of Fe₂N₆-S; (E-G) are quoted with permission from Liu et al.^[188]; (H) EDS image of Cu-Se DACs; (I and J) HAADF-STEM image of Cu-Se DACs (I) and Cu-Se SACs (J); (H-J) are quoted with permission from Sun et al.^[189]. HAADF-STEM: High-angle annular dark field scanning transmission electron microscopy; EDS: energy-dispersive X-ray spectroscopy; HRTEM: high-resolution transmission electron microscopy; DACs: dual-atom catalysts; SACs: single-atom catalysts.