Advanced

Influence of Oxygen Vacancies on the Properties of Ceria-Supported Gold

Weststrate, C. J.; Westerström, Rasmus LU ; Lundgren, Edvin LU ; Mikkelsen, Anders LU and Andersen, Jesper N LU (2009) In Journal of Physical Chemistry C 113(2). p.724-728
Abstract
The adsorption of CO on narrosized gold particles deposited on a cerium oxide substrate is strongly influenced by the roughness and concentration of oxygen vacancies of the CeOx substrate surface. Literature showed that Au nucleates at step edges on oxidized samples. For oxidized samples we found that the Au dispersion is dependent on the surface roughness. A rough CeO2 surface has a higher step density, which results in a Au higher particle density with a smaller average diameter. Other studies showed that Au nucleates on oxygen vacancies on reduced CeOx substrates. We found that small Au particles adsorbed on oxygen vacancies exhibit a significantly higher Au 4f binding energy than Au particles on oxidized CeO2. Relatively less CO... (More)
The adsorption of CO on narrosized gold particles deposited on a cerium oxide substrate is strongly influenced by the roughness and concentration of oxygen vacancies of the CeOx substrate surface. Literature showed that Au nucleates at step edges on oxidized samples. For oxidized samples we found that the Au dispersion is dependent on the surface roughness. A rough CeO2 surface has a higher step density, which results in a Au higher particle density with a smaller average diameter. Other studies showed that Au nucleates on oxygen vacancies on reduced CeOx substrates. We found that small Au particles adsorbed on oxygen vacancies exhibit a significantly higher Au 4f binding energy than Au particles on oxidized CeO2. Relatively less CO adsorbs on small Au particles on a reduced substrate, with a significantly lower adsorption energy than on Au on an oxidized substrate. For larger particles the influence of oxygen vacancies in the substrate is negligible. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
113
issue
2
pages
724 - 728
publisher
The American Chemical Society
external identifiers
  • wos:000262324600037
  • scopus:61649088402
ISSN
1932-7447
DOI
10.1021/jp8088116
language
English
LU publication?
yes
id
d0efd7da-0c45-4021-8155-cb2493b66c02 (old id 1312783)
date added to LUP
2009-03-13 12:30:40
date last changed
2017-11-19 03:31:10
@article{d0efd7da-0c45-4021-8155-cb2493b66c02,
  abstract     = {The adsorption of CO on narrosized gold particles deposited on a cerium oxide substrate is strongly influenced by the roughness and concentration of oxygen vacancies of the CeOx substrate surface. Literature showed that Au nucleates at step edges on oxidized samples. For oxidized samples we found that the Au dispersion is dependent on the surface roughness. A rough CeO2 surface has a higher step density, which results in a Au higher particle density with a smaller average diameter. Other studies showed that Au nucleates on oxygen vacancies on reduced CeOx substrates. We found that small Au particles adsorbed on oxygen vacancies exhibit a significantly higher Au 4f binding energy than Au particles on oxidized CeO2. Relatively less CO adsorbs on small Au particles on a reduced substrate, with a significantly lower adsorption energy than on Au on an oxidized substrate. For larger particles the influence of oxygen vacancies in the substrate is negligible.},
  author       = {Weststrate, C. J. and Westerström, Rasmus and Lundgren, Edvin and Mikkelsen, Anders and Andersen, Jesper N},
  issn         = {1932-7447},
  language     = {eng},
  number       = {2},
  pages        = {724--728},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Influence of Oxygen Vacancies on the Properties of Ceria-Supported Gold},
  url          = {http://dx.doi.org/10.1021/jp8088116},
  volume       = {113},
  year         = {2009},
}