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Oxygen vacancy formation for transient structures on the CeO2(110) surface at 300 and 750 K
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
2007 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 126, no 23, 234706- p.Article in journal (Refereed) Published
Abstract [en]

Ab initio embedded-cluster calculations have been performed for the CeO2(110) surface using temperature induced structures from molecular dynamics (MD) snapshots. As a first step towards understanding how temperature induced distortions of the surface structure influence the surface oxygen reactivity, the energy cost of removing an O atom from the surface was calculated for 41 snapshots from the MD simulation at 300 K. The quantum mechanical embedded-cluster calculations show that already at 300 K the dynamics causes significant fluctuations (root mean square of 0.37 eV) in the O vacancy formation energy (Evac) while the distribution of the two excess electrons associated with the vacancy is virtually unaffected by the surface dynamics and remains localized on the two Ce ions close to the vacancy. It is also found that the quantum mechanical Evac fluctuations can be reproduced by oxygen vacancy calculations using only the relaxed shell-model force field (FF) itself and the MD geometries. Using the FF as the interaction model, the effect of raising the temperature to 750 K and the effect of doping with Ca were investigated for the oxygen vacancy formation.

Place, publisher, year, edition, pages
2007. Vol. 126, no 23, 234706- p.
Keyword [en]
cerium compounds, ab initio calculations, molecular dynamics method, surface structure, vacancies (crystal), doping, surface dynamics, surface chemistry
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-27422DOI: 10.1063/1.2721537ISI: 000247469100038OAI: oai:DiVA.org:uu-27422DiVA: diva2:55317
Available from: 2007-08-14 Created: 2007-08-14 Last updated: 2017-12-07Bibliographically approved

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Hermansson, Kersti

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