fig8

Figure 8. (A) Atomic-resolution HAADF-STEM image of Pt₁/Cu-ZIS with white circle showing the Pt single atoms; (B) representative HAADF-STEM image with (C) the intensity profile of the dark cyan arrow in (B); (D and E) the crystal structure of Pt₁/Cu-ZIS, Mulliken charge analysis and the density difference of Pt atoms adsorbed over (F) ZIS and (G) Cu-ZIS. Figures are quoted with permission from ref^[60], Copyright 2021, Wiley-VCH; (H) Calculated differential charge density indicated the charge redistribution of the Pd@Pt nanoparticles with SAA structure and core-shell structure of different Pt layers. Figures are quoted with permission from ref^[61], Copyright 2021, Natl. Sci. Rev. HAADF-STEM: High-angle annular dark field scanning transmission electron microscopy; ZIS: ZnIn₂S₄; SAA: single-atom alloy.