fig3
![The recent progress of single-atom catalysts on amorphous substrates for electrocatalysis](https://image.oaes.cc/da1e0358-6a90-4d39-83d2-a611ab403c88/em4041.fig.3.jpg)
Figure 3. Single atoms are anchored at doped heteroatoms(A-D), defect sites(E-G) and metal atoms(H-K): (A) anchoring diagram of CuC4/CoN4@HC. (B) FT k3-weighted EXAFS spectra for the Co K-edge of CuC4/CoN4@HC, Co foil, CoO, and Co3O4. (C) Model of CoN4 sites and fitting curves of CuC4/CoN4@HC. (D) Top view of the differential charge densities of CuC4/CoN4@HC. Reproduced with permission from Ref.[58] Copyright 2021, American Chemical Society. (E) The electron density differences in the C-MoS2, the structure model of C-M-Mo. (F and G) AC TEM images of C-Co-MoS2. Reproduced with permission from Ref.[63] Copyright 2023, Wiley-VCH. (H) The model structure of Fe-Rh interbonds. Reproduced with permission from Ref.[67] Copyright 2020, Wiley-VCH. (I) Plot of the H adsorption free energy versus η10. (J and K) The differential charge densities of Sn-MoSxOy (J), RhSn-MoSxOy (K). Reproduced with permission from Ref.[68] Copyright 2022, Wiley-VCH.