fig6

Figure 6. (A) Preparation of Fe₁-Ni₁-N-C on ZIF-8; (B) AC HAADF-STEM image and EELS spectra; (C) Fe K-edge EXAFS spectrum fitting and (inset) optimized configuration; (A-C) Reproduced with permission from Ref.^[95]. Copyright 2021, American Chemical Society; (D) Top view of the differential charge densities of CuC₄/CoN₄@HC; (E) Wavelet-transformed k³-weighted EXAFS spectra of Cu/Co foil, CuO, Co₃O₄, and CuC₄/CoN₄@HC; (F) Cu/Co K-edge EXAFS fitting curves; (D-F) Reproduced with permission from Ref.^[96]. Copyright 2021, American Chemical Society; (G) Fe k-edge EXAFS fitting; (H) Co k-edge EXAFS fitting; (I) Model of fitting active site; (G-I) Reproduced with permission from Ref.^[114]. Copyright 2023, The Royal Society of Chemistry. AC HAADF-STEM: Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy; EELS: electron energy-loss spectroscopy; EXAFS: extended X-ray absorption fine structure.