fig5

Figure 5. (A) Schematic illustration of the synthesis of Co₁/G SACs with tuneable loadings; (B) Evolution of Co loadings of Co₁/G SACs and epoxy content in graphene as a function of the number of ALD cycles; (C) EEL spectra of O K-edge and Co L_2,3-edge acquired in the bare graphene region; (D) FT-EXAFS of CoCp/G, Co₁/G SACs with the corresponding structures. The (A-D) are quoted with permission from Yan et al.^[68]; (E) Illustration of preparation, AC-HAADF-STEM images, and EELS spectra of Fe_x-NOC (x = 1, 2, 3, 4); (F) FT-EXAFS signals of Fe catalysts along with reference samples (dashed lines); (G) XANES spectra at the Fe K-edge of the Fe_x-NOC, Fe foil, Fe₂O₃, FePc, and FeO. The (E-G) are quoted with permission from Bu et al.^[69]. SACs: Single-atom catalysts; ALD: Atomic layer deposition; EELS: Electron energy loss spectroscopy; 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; XANES: X-ray absorption near edge structure.