fig11

Figure 11. (A) NH₃ yield rate and FE of Fe₁-N-C at various potentials; NH₃ yield rate and FE of (B) Co₁-N-C and (C) Ni₁-N-C at various potentials; (D) Fe K-edge XANES; (E) FT-EXAFS curves of Fe foil, Fe₁-N-C and Fe₂O₃; (F) AC HAADF-STEM images of Fe₁-N-C. The (A-F) are quoted with permission from Zhang et al.^[96]; (G) AC MAADF-STEM of Fe SAC; (H) FT k³-weighted χ(k)-function of the EXAFS spectra at Fe K-edge; (I) FE_NH3 at each given potential. The (G-I) are quoted with permission from Wu et al.^[97]. FE: Faradaic efficiency; FT-EXAFS: Fourier transform of extended X-ray absorption fine structure; AC HAADF-STEM: Aberration-corrected high-angle annular dark field scanning transmission electron microscopy; SACs: Single-atom catalysts.