Fig. 3: X-ray absorption spectroscopy characterization of Fe,W-N-C catalyst.
From: Ten thousand hour stable zinc air batteries via Fe and W dual atom sites
a Normalized Fe K-edge X-ray absorption near-edge structure (XANES) spectra of Fe foil, FeO, Fe2O3, and Fe,W-N-C catalyst. b Fourier transform k3-weighted Fe K-edge extended X-ray absorption fine structure (FT-EXAFS) spectra at R space and FT-EXAFS fitting curves of Fe,W-N-C. c 3D contour wavelet transformed Fe K-edge EXAFS map of the Fe,W-N-C catalyst. d Normalized W L3-edge XANES spectra of W foil, WO3, and Fe,W-N-C. e k2-weighted W L3-edge FT-EXAFS spectra and FT-EXAFS fitting curves of Fe,W-N-C. f 3D contour wavelet transformed W L3-edge EXAFS map of the Fe,W-N-C catalyst. g The atomic structure model of the Fe,W-N-C catalyst. h Comparison between the experimental Fe K-edge XANES spectrum of Fe,W-N-C and the theoretical spectrum calculated for the atomic structure in (g). i Comparison between the experimental W L3-edge XANES spectrum of Fe,W-N-C and the theoretical spectrum calculated for the atomic structure in (g).
