The Importance of Bulk Ti3+ Defects in the Oxygen Chemistry on Titania Surfaces

被引：202

作者：

Lira, Estephania

Wendt, Stefan ^{[1
]}

Huo, Peipei

Hansen, Jonas O.

Streber, Regine

Porsgaard, Soren

Wei, Yinying

Bechstein, Ralf

Laegsgaard, Erik

Besenbacher, Flemming

机构：

[1] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus C, Denmark

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 17期

基金：

欧洲研究理事会;

关键词：

TIO2(110) SURFACE; MOLECULAR-OXYGEN; RUTILE TIO2(110); CO OXIDATION; O-2; PHOTOCATALYSIS; CHEMISORPTION; SCIENCE; SITE; STM;

D O I：

10.1021/ja200884w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The role of bulk defects in the oxygen chemistry on reduced ruffle TiO2(110)-(1 x 1) has been studied by means of temperature-programmed desorption spectroscopy and scanning tunneling microscopy measurements. Following O-2 adsorption at 130 K, the amount of O-2 desorbing at similar to 410 K initially increased with increasing density of surface oxygen vacancies but decreased after further reduction of the TiO2(110) crystal. We explain these results by withdrawal of excess charge (Ti3+) from the TiO2(110) lattice to oxygen species on the surface and by a reaction of Ti interstitials with O adatoms upon heating. Important consequences for the understanding of the O-2-TiO2 interaction are discussed.

引用

收藏

页码：6529 / 6532

页数：4

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