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Supercharged Low-Temperature Oxygen Storage Capacity of Ceria at the Nanoscale
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
2013 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 4, no 4, 604-608 p.Article in journal (Refereed) Published
Abstract [en]

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 (O-2(-)) 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.

Place, publisher, year, edition, pages
2013. Vol. 4, no 4, 604-608 p.
Keyword [en]
Nanoparticles, Oxide, Nanorods, Surfaces, Planes, Shape
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-120171DOI: 10.1021/jz3020524ISI: 000315432000010Scopus ID: 2-s2.0-84874186020OAI: oai:DiVA.org:kth-120171DiVA: diva2:613759
Funder
Swedish Research CouncileSSENCE - An eScience Collaboration
Note

QC 20130402

Available from: 2013-04-02 Created: 2013-04-02 Last updated: 2017-12-06Bibliographically approved

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