Fig. 3: X-ray absorption spectroscopy characterization of SiO2/FeNSiC and other samples. | Nature Communications

Fig. 3: X-ray absorption spectroscopy characterization of SiO2/FeNSiC and other samples.

From: Enhancing the ORR durability of single atomic Fe-N4 active sites with implanted SiO2 nanoparticles as radical and H2O2 inhibitors

Fig. 3: X-ray absorption spectroscopy characterization of SiO2/FeNSiC and other samples.

a Fe K-edge X-ray absorption near-edge structure (XANES) and (b) Fourier transform k3-weighted Fe K-edge extended X-ray absorption fine structure (FT-EXAFS) spectra of SiO2/FeNSiC, FeNSiC, FeNC, Fe2SiO4, Fe foil, FeO, Fe2O3, and FePc. c, d Experimental (black line) and fitted (red cycle) Fe FT-EXAFS fitting signals in R space of SiO2/FeNSiC (the individual paths indicate unrefined theoretical scattering paths from the fitted FEFF model, indicating their baseline radial positions and qualitative relevance). Wavelet transform (WT)-EXAFS of the Fe K-edge of (e) Fe foil, (f) Fe2O3, (g) SiO2/FeNSiC and (h) FeNC from top to bottom. Source data are provided as a Source Data file.

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