Title

Morphology And Surface Analysis Of Pure And Doped Cuboidal Ceria Nanoparticles

Abstract

Cuboidal nanoparticles of ceria are examined by high resolution imaging and analysis to explore their local morphology of faces, edges, and corners. Synthesized with and without Sm doping using a hydrothermal process, we find a high fraction of particles enclosed by {100} facets, which are normally energy-penalized compared to octahedral {111} facets. Electron tomography conducted at high magnification with lattice resolved imaging is combined with electron energy loss spectroscopy revealing oxidation states of Ce ions. It is found that extended {100} faces exist predominantly without local nanofaceting, except for {111} corner caps and subfacets on {110} edges. Reduced Ce is found on all {100} surfaces, while Sm doping does not lower the reduced Ce concentration. Molecular dynamics simulations are used to complement the microscopy, including the formation of {111} subfacets on {110} edges, formation of a {111} corner facet, and also the fact that reduced Ce ions prefer low coordinated positions like steps and corners along with more active {100} faces. © 2013 American Chemical Society.

Publication Date

11-21-2013

Publication Title

Journal of Physical Chemistry C

Volume

117

Issue

46

Number of Pages

24561-24569

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp405993v

Socpus ID

84888623266 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84888623266

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