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Edvin Lundgren. Portrait.

Edvin Lundgren

Professor

Edvin Lundgren. Portrait.

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

Author

  • Sara Blomberg
  • Rasmus Westerström
  • Natalia Martin
  • Edvin Lundgren
  • Jesper N Andersen
  • Maria Messing
  • Johan Gustafson

Summary, in English

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.

Department/s

  • Synchrotron Radiation Research
  • Solid State Physics
  • NanoLund: Centre for Nanoscience

Publishing year

2014

Language

English

Pages

153-158

Publication/Series

Surface Science

Volume

628

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics
  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • Rh(100)
  • Nanopartides
  • High pressure NES

Status

Published

ISBN/ISSN/Other

  • ISSN: 0039-6028