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A high pressure X-ray photoelectron spectroscopy study of oxidation and reduction of Rh(100) and Rh nanoparticles

Blomberg, Sara LU ; Westerström, Rasmus LU ; Martin, Natalia LU ; Lundgren, Edvin LU ; Andersen, Jesper N LU ; Messing, Maria LU and Gustafson, Johan LU (2014) In Surface Science 628. p.153-158
Abstract
We have studied the oxidation and reduction of Rh(100) and SiO2 supported Rh particles using high pressure X-ray photoelectron spectroscopy. We show that the formation and reduction of Rh bulk oxide can be followed in situ in O-2 and CO pressures in the range of 0.1 Torr. In general, the oxidation/reduction processes are similar on Rh(100) and the nanoparticles, but there are significant differences in temperature dependence. Already at a sample temperature of 140 degrees C, the particles show clear signs of a thin bulk oxide, while an ultra-thin so-called surface oxide covers the single crystal at the same temperature. Both of these oxide films, however, hinder further oxidation, and a thick oxide is only found at a temperature of at... (More)
We have studied the oxidation and reduction of Rh(100) and SiO2 supported Rh particles using high pressure X-ray photoelectron spectroscopy. We show that the formation and reduction of Rh bulk oxide can be followed in situ in O-2 and CO pressures in the range of 0.1 Torr. In general, the oxidation/reduction processes are similar on Rh(100) and the nanoparticles, but there are significant differences in temperature dependence. Already at a sample temperature of 140 degrees C, the particles show clear signs of a thin bulk oxide, while an ultra-thin so-called surface oxide covers the single crystal at the same temperature. Both of these oxide films, however, hinder further oxidation, and a thick oxide is only found at a temperature of at least 300 degrees C, for both samples. The reduction, in contrast, starts at a higher temperature on the particles as compared to the single crystal, but once started the particles are completely reduced at lower temperatures. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Rh(100), Nanopartides, High pressure NES
in
Surface Science
volume
628
pages
153 - 158
publisher
Elsevier
external identifiers
  • wos:000340221200023
  • scopus:84904981747
ISSN
0039-6028
DOI
10.1016/j.susc.2014.06.009
language
English
LU publication?
yes
id
440b9a65-c4a4-4d0e-aab2-4b8d976fd03c (old id 4659442)
date added to LUP
2014-09-25 07:50:44
date last changed
2017-07-02 03:51:27
@article{440b9a65-c4a4-4d0e-aab2-4b8d976fd03c,
  abstract     = {We have studied the oxidation and reduction of Rh(100) and SiO2 supported Rh particles using high pressure X-ray photoelectron spectroscopy. We show that the formation and reduction of Rh bulk oxide can be followed in situ in O-2 and CO pressures in the range of 0.1 Torr. In general, the oxidation/reduction processes are similar on Rh(100) and the nanoparticles, but there are significant differences in temperature dependence. Already at a sample temperature of 140 degrees C, the particles show clear signs of a thin bulk oxide, while an ultra-thin so-called surface oxide covers the single crystal at the same temperature. Both of these oxide films, however, hinder further oxidation, and a thick oxide is only found at a temperature of at least 300 degrees C, for both samples. The reduction, in contrast, starts at a higher temperature on the particles as compared to the single crystal, but once started the particles are completely reduced at lower temperatures. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Blomberg, Sara and Westerström, Rasmus and Martin, Natalia and Lundgren, Edvin and Andersen, Jesper N and Messing, Maria and Gustafson, Johan},
  issn         = {0039-6028},
  keyword      = {Rh(100),Nanopartides,High pressure NES},
  language     = {eng},
  pages        = {153--158},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {A high pressure X-ray photoelectron spectroscopy study of oxidation and reduction of Rh(100) and Rh nanoparticles},
  url          = {http://dx.doi.org/10.1016/j.susc.2014.06.009},
  volume       = {628},
  year         = {2014},
}