articleScienceJul 28, 2005Closed access

Electron Localization Determines Defect Formation on Ceria Substrates

Leibniz University Hannover · Scuola Internazionale Superiore di Studi Avanzati · +4 more institutions

PubMed
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Abstract

The high performance of ceria (CeO2) as an oxygen buffer and active support for noble metals in catalysis relies on an efficient supply of lattice oxygen at reaction sites governed by oxygen vacancy formation. We used high-resolution scanning tunneling microscopy and density functional calculations to unravel the local structure of surface and subsurface oxygen vacancies on the (111) surface. Electrons left behind by released oxygen localize on cerium ions. Clusters of more than two vacancies exclusively expose these reduced cerium ions, primarily by including subsurface vacancies, which therefore play a crucial role in the process of vacancy cluster formation. These results have implications for our…

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1,420
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100%
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Authors

8

Topics & keywords

Keywords
  • Cerium
  • Scanning tunneling microscope
  • Vacancy defect
  • Chemical physics
  • Oxygen
  • Ion
  • Catalysis
  • Cluster (spacecraft)
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