同步辐射及其在无机材料中的应用进展

刘云鹏, 盛伟繁, 吴忠华

Synchrotron Radiation and Its Applications Progress in Inorganic Materials

LIU Yunpeng, SHENG Weifan, WU Zhonghua

图11 1cFe-Pt/SiO2催化剂的原位XAFS测试及其催化机理示意图[54]

Fig. 11 In situ XAFS measurements of the 1cFe-Pt/SiO2 catalyst and its schematic illustration of catalytic mechanism[54] (a-d) XANES spectra at Fe K edge (a) and Pt L3 edge (b), detailed structural information shown in the k3-weighted FT spectra in R-space at the Fe K edge (c) and the Pt L3 edge (d) (E: energy, R: distance between absorbing atom and neighbouring scatterer atoms, without correcting for scattering phase shift, and χ(k): the amplitude of the EXAFS oscillations as a function of photoelectron wavenumber k (a.u., arbitrary units). The inset in (a) shows a magnified view of the pre-edge peak A. The energy positions of Fe pre-edge peak A, Fe white-line peak B and Pt white-line peak C, as well as R-space peak positions of the shells of Fe-O, Fe-Fe, Fe-Pt, Pt-O and Pt-Pt, are also shown; (e) Schematic models of 1cFe-Pt/SiO2-O (left), 1cFe-Pt/SiO2-R (middle) and 1cFe-Pt/SiO2-P (right), Fe, O, H and Pt atoms are shown in orange, red, white, and blue, respectively. (1 Å=0.1 nm) (colorful figures are available on website)