CATALYTIC DISSOCIATION OF H2O BY SrTiO3(100) STEP SITES

被引：4

作者：

Brookes, N. B. ^{[1
]}

Quinn, F. M. ^{[2
]}

Thornton, G. ^{[1
,2
]}

机构：

[1] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England

[2] Daresbury Lab, Sci & Engn Res Council, Warrington WA4 4AD, Cheshire, England

来源：

CATALYSIS TODAY | 1988年 / 2卷 / 05期

关键词：

D O I：

10.1016/0920-5861(88)85018-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The adsorption of H2O on fractured and planar surfaces of SrTiO3(100) has been studied using photoemission spectroscopy. Vaf ence region spectra evidence molecular adsorption on the planar surface and dissociative adsorption on the fractured surface. Features arising from surface Sr (Ti) atoms on the SrO (TiO2) terraces of SrTiO3(100) have been resolved in core- level photoemission spectra: the surface Sr 3d (Ti 3s) features lie to lower (higher) initial energy of the bulk- derived peaks by ca. 7.0 eV (1.7 eV). These results are consistent with the expected enhancement of covalent bonding in the TiO2-terrace surface. From the valence and core level spectra we deduce that step- sites, which connect the two types of terrace, act as catalytic centres for H2O dissociation.

引用

页码：547 / 555

页数：9

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