Supercharged Low-Temperature Oxygen Storage Capacity of Ceria at the Nanoscale

We provide an explanation for the experimental finding of a dramatically enhanced low-temperature oxygen storage capacity for small ceria nanoparticles. At low temperature, small octahedral ceria nanoparticles will be understoichiometric at both oxidizing and reducing conditions without showing expl...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2013-02, Vol.4 (4), p.604-608
Main Authors: Kullgren, Jolla, Hermansson, Kersti, Broqvist, Peter
Format: Article
Language:English
Subjects:
Nanoparticles
Nanorods
Oxide
Physical Processes in Nanomaterials and Nanostructures
Planes
Shape
Surfaces
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Summary:We provide an explanation for the experimental finding of a dramatically enhanced low-temperature oxygen storage capacity for small ceria nanoparticles. At low temperature, small octahedral ceria nanoparticles will be understoichiometric at both oxidizing and reducing conditions without showing explicit oxygen vacancies. Instead, rather than becoming stoichiometric at oxidizing conditions, such particles are stabilized through oxygen adsorption forming superoxo (O2 –) ions and become in this way supercharged with oxygen. The supercharging effect is size-dependent and largest for small nanoparticles where it gives a direct increase in the oxygen storage capacity and simultaneously provides a source of active oxygen species at low temperatures.
ISSN:1948-7185
1948-7185
DOI:10.1021/jz3020524