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Supercharged Low-Temperature Oxygen Storage Capacity of Ceria at the Nanoscale
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi.
2013 (engelsk)Inngår i: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 4, nr 4, s. 604-608Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2013. Vol. 4, nr 4, s. 604-608
Emneord [en]
Nanoparticles, Oxide, Nanorods, Surfaces, Planes, Shape
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-120171DOI: 10.1021/jz3020524ISI: 000315432000010Scopus ID: 2-s2.0-84874186020OAI: oai:DiVA.org:kth-120171DiVA, id: diva2:613759
Forskningsfinansiär
Swedish Research CouncileSSENCE - An eScience Collaboration
Merknad

QC 20130402

Tilgjengelig fra: 2013-04-02 Laget: 2013-04-02 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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