RESEARCH / A0578
Bio-Assisted Atomically Dispersed Fe–N–C Electrocatalyst with UltraLow Fe Loading toward pH-Universal Oxygen Reduction Reaction and Neutral Zn-Air Battery
Read the original paper · 10.1021/acssuschemeng.3c00987 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 2. (a) XRD patterns of Fe@G at different loadings. (b) Raman Spectra of Fe@G at different loadings. (c) XPS survey of Fe@G. (d−e) High-resolution XPS spectra of (d) N 1s and (e) Fe 2p for Fe@G-800/100. (f) Normalized XANES spectra of Fe@G-800 and standard reference samples at Fe K-edge. (g) k2-Weighted Fourier-transform spectra from EXAFS at R-space. (h) EXAFS fitting for Fe@G-800. The inset shows the schematic model of the Fe coordination environment in Fe@G-800. The gray, red, and blue balls correspond to C, N, and Fe atoms, respectively. (i) k2-Weighted WT-EXAFS contour plots of Fe@G-800, FePc, and the Fe foil.