Fig. 4: Fabricating UHL-SACs on N-doped Carbon (NC) substrate.

The aberration-corrected HAADF-STEM images and FT-EXAFS spectra of NC supported UHL-SACs with (a) Pt, (b) Fe, (c) Co, (d) Ni, and (e) Cu. f TEM and (g) Aberration-corrected HAADF-STEM images of the UHL HESACs. h The metal content in the HESACs. i FT-EXAFS spectra for the metals in HESACs.