Direct Visualization of Au Atoms Bound to TiO2(110) O-Vacancies

被引：23

作者：

Mellor, Andrew ^{[1
,2
]}

Humphrey, David ^{[1
,2
]}

Yim, Chi M. ^{[1
,2
]}

Pang, Chi L. ^{[1
,2
]}

Idriss, Hicham ^{[1
,2
,3
]}

Thornton, Geoff ^{[1
,2
]}

机构：

[1] UCL, Dept Chem, 20 Gordon St, London WC1H 0AJ, England

[2] UCL, London Ctr Nanotechnol, 20 Gordon St, London WC1H 0AJ, England

[3] KAUST, SABIC CRI, Fundamental Catalysis, Thuwal, Saudi Arabia

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 44期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

SINGLE ATOMS; TIO2; 110; CATALYSIS; GOLD; SURFACES;

D O I：

10.1021/acs.jpcc.7b09608

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：

Au nanoparticles supported on reducible metal oxide surfaces: are known to be active catalysts for a number of reactions including CO oxidation and hydrogen production. The exact choice of a metal oxide support has been shown to have a marked impact on activity, suggesting that interactions between Au and the support play a key role in catalysis. For TiO2, a model substrate for Au catalysis, it had been thought that bridging oxygen vacancies are involved in binding Au atoms to the (110) surface based on indirect evidence. However, a recent scanning transmission electron microscopy study of single Pt atoms on TiO2(110) suggests that subsurface vacancies are more important. To clarify the role of bridging or subsurface vacancies we employ scanning tunneling microscopy to determine the bonding site of single Au atoms on TiO2(110). Using in situ deposition as well as a manipulation method, we provide definitive evidence that the bonding site is atop surface oxygen vacancies.

引用

页码：24721 / 24725

页数：5

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