Morphology and Surface Analysis of Pure and Doped Cuboidal Ceria Nanoparticles

    Authors

    U. M. Bhatta; D. Reid; T. Sakthivel; T. X. T. Sayle; D. Sayle; M. Molinari; S. C. Parker; I. M. Ross; S. Seal;G. Mobus

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    ELECTRON TOMOGRAPHY; OXYGEN STORAGE; IN-SITU; OXIDATION; NANOSTRUCTURES; NANOCRYSTALS; SIMULATION; RESOLUTION; PARTICLES; CHEMISTRY; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    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 {1 11} corner facet, and also the fact that reduced Ce ions prefer low coordinated positions like steps and corners along with more active {100} faces.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    117

    Issue/Number

    46

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    24561

    Last Page

    24569

    WOS Identifier

    WOS:000327557300056

    ISSN

    1932-7447

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