Skip to main content
Other
In situ XPS study of Pd(111) oxidation at elevated pressure, Part 2: Palladium oxidation in the 10^1 mbar range
Birck and NCN Publications
  • Harald Gabasch, Institut für Physikalische Chemie, Universität Innsbruck
  • Werner Unterberger, Institut für Physikalische Chemie, Universität Innsbruck
  • Konrad Hayek, Institut für Physikalische Chemie, Universität Innsbruck
  • Bernhard Klötzer, Institut für Physikalische Chemie, Universität Innsbruck
  • Evgueni Kleimenov, Abteilung Anorganische Chemie, Fritzx-Haber-Institut der Max-Planck-Gesellschaft
  • Detre Teschner, Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Lanck-Gesellschaft
  • Spiros Zafeiratos, Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft
  • Michael Hävecker, Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Olanck-Gesellschaft
  • Axel Knop-Gericke, Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Olanck-Gesellschaft
  • Robert Schlögl, Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Olanck-Gesellschaft
  • Jinyi Han, School of Chemical Engineering, Purdue University
  • Fabio H. Ribeiro, School of Chemical Engineering, Purdue University
  • Balazs Aszalos-Kiss, Materials and Surface Science Institute and Physics Department, University of Limerick
  • Teresa Curtin, Materials and Surface Science Institute and Physics Department, University of Limerick
  • Dmitry Zemlyanov, Birck Nanotechnology Center, Purdue University; Materials and Surface Science Institute, and Physics Department, University of Limerick
Abstract

The oxidation of the Pd(1 1 1) surface was studied by in situ XPS during heating and cooling in 0.4 mbar O2. The in situ XPS data were complemented by ex situ TPD results. A number of oxygen species and oxidation states of palladium were observed in situ and ex situ. At 430 K, the Pd(1 1 1) surface was covered by a 2D oxide and by a supersaturated Oads layer. The supersaturated Oads layer transforms into the Pd5O4 phase upon heating and disappears completely at approximately 470 K. Simultaneously, small clusters of PdO, PdO seeds, are formed. Above 655 K, the bulk PdO phase appears and this phase decomposes completely at 815 K. Decomposition of the bulk oxide is followed by oxygen dissolution in the near-surface region and in the bulk. The oxygen species dissolved in the bulk is more favoured at high temperatures because oxygen cannot accumulate in the near-surface region and di

Comments
doi:10.1016/j.susc.2006.05.029
Keywords
  • X-ray photoelectron spectroscopy; Chemisorption; Oxidation; Surface chemical reaction; Palladium; Single crystal surfaces; Low index single
Date of this Version
5-9-2006
Citation
Surface Science 600 (2006) 2980–2989
Citation Information
Harald Gabasch, Werner Unterberger, Konrad Hayek, Bernhard Klötzer, et al.. "In situ XPS study of Pd(111) oxidation at elevated pressure, Part 2: Palladium oxidation in the 10^1 mbar range" (2006)
Available at: http://works.bepress.com/dmitry_zemlyanov/11/