Fig. 3: The structure and chemical state investigation.

a XRD patterns, (b) N2 adsorption-desorption isotherms and (c) Pt 4 f XPS of catalysts. Original data (gray circle), fitting (gray line) Pt2+ (red line) and Pt0 (blue line). d Pt L3-edge XANES spectra of Pt@HieTS-1, PtO2, and Pt foil. e FT EXAFS spectra of Pt@HieTS-1, PtO2 and Pt foil. f FT EXAFS fitting spectrum of Pt@ HieTS-1 at R space. WT EXAFS spectra of (g) Pt foil, (h) PtO2 and (i) Pt@HieTS-1.