fig5

Figure 5. (A) The method for preparing Pt-Pd DAC; (B) HAADF-STEM image of Pt-Pd DAC; (C) EXAFS spectra in the R space of Pd K-edge; (D) Charge density of Pt-Pd DAC; (A-D) Reproduced with permission from Ref.^[90]. Copyright 2022, Wiley-VCH; (E) Perspective and top view of the (PtCO)₂ dimer on Fe₃O₄(001); (F) Constant-height ncAFM image taken with a CO-functionalized tip; (G) Constant-height ncAFM image of the (PtCO)₂ dimers; (E-G) Reproduced with permission from Ref.^[92]. Copyright 2022, American Association for the Advancement of Science. DACs: Dual-atom catalysts; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; EXAFS: X-ray absorption fine structure; AFM: atomic force microscopy.