Fig. 2: Morphology and structure characterizations of Fe–Nx host materials. | Nature Communications

Fig. 2: Morphology and structure characterizations of Fe–Nx host materials.

From: Unsaturation degree of Fe single atom site manipulates polysulfide behavior in sodium-sulfur batteries

Fig. 2

a SEM image of Fe‒Nx (1100). b HAADF-STEM images of Fe‒Nx, with atomically dispersed iron species highlighted by yellow circles. c XANES spectra of Fe K-edge for Fe‒Nx, Fe2O3, and Fe foil references. d EXAFS spectra and fitting curves of Fe‒Nx. Insets are the fitting models in which the red, blue, and grey spheres represent Fe, N, and C atoms, respectively. e, f N2 adsorption–desorption isotherms (e) and corresponding pore size distributions (f) of Fe–N1, Fe–N2, and Fe–N4 (Inset: Schematic illustrations of the pore structure of Fe–Nx host materials corresponding to f). Source data are provided as a Source Data file.

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