Identification of oxygen sites at the V2O5(010) surface by core-level electron spectroscopy:: Ab initio cluster studies

被引:26
|
作者
Kolczewski, C [1 ]
Hermann, K [1 ]
机构
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
来源
JOURNAL OF CHEMICAL PHYSICS | 2003年 / 118卷 / 16期
关键词
D O I
10.1063/1.1562191
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Vanadium oxide contains differently coordinated oxygen sites which can participate in catalytic oxidation reactions of industrial relevance. For a full understanding of corresponding reaction steps an estimate of the relative importance of these oxygen sites for a given reaction at the surface is required. This may be possible using electron spectroscopy together with theoretical methods. We have performed density functional theory cluster calculations to describe the electronic structure at the V2O5(010) surface which possesses singly, doubly, and triply coordinated oxygen sites, O(1-3). For these sites we have evaluated O 1s core level excitation spectra using the transition state method. The analysis of the spectra based on atom projected densities-of-states of the unoccupied orbitals shows that all spectral features are determined by local V-O bonding. The spectra for different oxygen coordination differ enough to allow discrimination between the oxygen sites. In contrast, differences in the calculated O 1s core ionization potentials depend much less on coordination. A comparison of the theoretical O 1s core level excitation spectra with experimental NEXAFS and ELNES spectra yields rather good agreement and assists the interpretation of the latter. Further, the theoretical IP data are consistent with experimental XPS spectra. (C) 2003 American Institute of Physics.
引用
收藏
页码:7599 / 7609
页数:11
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