Figure 4: Structural analysis of RuCo@NC hybrid.

(a) The X-ray diffraction patterns of S-0, S-1, S-2, S-3, S-4, S-5 and S-6, respectively. (b) Raman spectrum of S-4, (c) The XPS result of the N1s spectrum enlarged from Supplementary Fig. 10a, (d) N₂ adsorption–desorption isotherm and pore size distribution plot (inset) of S-4.