Concentration of Ce3+ and Oxygen Vacancies in Cerium Oxide Nanoparticles

Temperature variations of the electron magnetic resonance (EMR) spectra and magnetization measurements are used to show that Ce3+ ions in concentration ≃18% are present in 3 nm CeO2 nanoparticles supported on silica aerogel. It is argued that the presence of Ce3+ implies the defect structure CeO2- x...

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Bibliographic Details
Published in:Chemistry of materials 2006-10, Vol.18 (21), p.5144-5146
Main Authors: Dutta, P, Pal, S, Seehra, M. S, Shi, Y, Eyring, E. M, Ernst, R. D
Format: Article
Language:English
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Summary:Temperature variations of the electron magnetic resonance (EMR) spectra and magnetization measurements are used to show that Ce3+ ions in concentration ≃18% are present in 3 nm CeO2 nanoparticles supported on silica aerogel. It is argued that the presence of Ce3+ implies the defect structure CeO2- x for ceria nanoparticles due to oxygen vacancies. This transformation of Ce4+ to Ce3+ driven by oxygen vacancies may be the key to understanding the catalytic properties of ceria.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm061580n