Journal
CHEMISTRY OF MATERIALS
Volume 18, Issue 21, Pages 5144-5146Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm061580n
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Temperature variations of the electron magnetic resonance (EMR) spectra and magnetization measurements are used to show that Ce3+ ions in concentration similar or equal to 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.
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