fig13

Figure 13. (A) TEM (The scale bar is 100 nm) and (B) Aberration-corrected HAADF-STEM of B-FeNi-DASC. (The scale bar is 2 nm); (C) HAADF-STEM intensity profile with atomic-resolution EELS for the Fe-Ni pair; (D) Fourier transform EXAFS for Fe-SAC, I-FeNi-DASC, and B-FeNi-DASC; (E) Wavelet-transform of Fe element for Fe foil, Fe-SAC, I-FeNi-DASC, and B-FeNi-DASC. Reprinted with permission from ref^[34]. Copyright 2022 Nature Publishing Group. TEM: Transmission electron microscopy; HAADF-STEM: high-angle annular dark-field-scanning transmission electron microscopy; B-FeNi-DASC: bonded Fe-Ni diatomic sites catalyst; EELS: electron energy loss spectroscopy; EXAFS: extended X-ray absorption fine structure; SAC: single-atom catalyst.