Fig. 2: Spectroscopy analysis.
From: Spin occupancy regulation of the Pt d-orbital for a robust low-Pt catalyst towards oxygen reduction
Comparisons of the X-ray absorption near-edge structure spectra of PtFe@FeSAs-N-C, FeSAs-N-C, Fe foil, FePc, and Pt foil: a XANES spectra of PtFe@FeSAs-N-C and Pt foil: Pt L3 edge. b XANES spectra of PtFe@FeSAs-N-C, FeSAs-N-C, Fe foil, and FePc: Fe K edge. c Liner fitting for Fe valences in PtFe@FeSAs-N-C, FeSas-N-C, Fe2O3, and Fe foil derived from corresponding Fe K-edge XANES spectra. d FT-EXAFS spectra of PtFe@FeSAs-N-C, FeSas-N-C, Fe foil, and FePc at the Fe K-edge. e Enlarged UPS spectra. f X-band EPR spectra of PtFe@FeSAs-N-C and FeSAs-N-C.
