fig3

Figure 3. (A) Scheme illustration of the synthetic procedure of NiN₃@CoN₃-NC^[67]. Copyright 2023, Elsevier B.V; (B) The dimer structure of active FeSn dual atom sites derived from the EXAFS result^[68]. Copyright 2024, American Chemical Society; (C) Schematic illustration of the synthetic procedure of the diatomic Ni/Cu-N-C catalyst^[69]. Copyright 2022, American Chemical Society; (D) The geometric structure of Fe-Ni-N-P-C^[70]. Copyright 2021, Cell Press; (E) Schematic illustration of the synthesis of the Cu₂-C₂N^[71]. Copyright 2024, Wiley-VCH. EXAFS: Extended X-ray absorption fine structure.