Fig. 3: X-ray absorption analysis of Co@Si SACs.
From: Epitaxially grown silicon-based single-atom catalyst for visible-light-driven syngas production
a Co K-edge XANES spectra and b Fitted Co K-edge EXAFS spectra of various Co@Si and control samples. The original spectra are available in Supplementary Fig. 8. The shaded rectangles are denoted spectral feature of metallic Co and CoOx, respectively. c The schematic shows the influence of Co concentration on the distribution of Co atoms on Si NCs. d Simulated coordination number and e, corresponding atomic distance values extracted from the Co K-edge EXAFS spectra of Co@Si and the control Co@SiO2 samples. Negligible values of Co–O and Co–Co contribution in the bond distance are denoted using asterisks (*).
