fig4

Figure 4. (A) Atomic structure model of Fe-N₂-Fe DAC^[74]. Copyright 2024, Wiley-VCH; (B) Atomic structure model of Cu-S-Ni/SNC^[75]. Copyright 2024, Wiley-VCH; (C) Schematic diagram of the polymerization-pyrolysis synthesis method of Co-N-Ni^[76]. Copyright 2023, American Chemical Society; (D) Schematic Illustration of the MIR strategy for DACs^[77]. Copyright 2024, American Chemical Society; (E) Schematic illustration of the synthesis of DACs via a macrocyclic precursor-mediated encapsulation-pyrolysis process. The model on the far right represents the local structure of the M¹M²-DAC^[78]. Copyright 2023, American Chemical Society. DAC: Dual-atom catalyst; SNC: sulfur- and nitrogen-co-doped carbon; MIR: metal ion recognition.