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Characterization of Mesoporosity in Ceria Particles Using Electron Microscopy

Published online by Cambridge University Press:  19 November 2010

Shao-Ju Shih ,
Pilar Rodrigo Herrero ,
Guoqiang Li ,
Chin-Yi Chen  and
Sergio Lozano-Perez
Shao-Ju Shih
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
Pilar Rodrigo Herrero
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK Dpto. de Ciencia e Ingeniería de Materiales Escuela Superior de Ciencias Experimetales y Tecnología Universidad Rey Juan Carlosc/ Tulipán s.n. 28933, Móstoles (Madrid), Spain
Guoqiang Li
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
Chin-Yi Chen
Affiliation:
Department of Materials Science and Engineering, Feng Chia University, No. 100 Wenhwa Road, Taichung, Taiwan, 40724, R.O.C.
Sergio Lozano-Perez*
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
*
Corresponding author. E-mail: sergio.lozano-perez@materials.ox.ac.uk
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Abstract

The geometry and three-dimensional (3D) morphology of the ceria particles synthesized by spray pyrolysis (SP) from two different precursors—cerium acetate hydrate and cerium nitrate hydrate (CeA and CeN ceria particles)—were characterized by transmission electron microscopy and electron tomography. Results were compared with surface area measurements, confirming that the surface area of CeA ceria particles is twice as large as that of CeN ceria particles. This result was supported by 3D microstructural observations, which have revealed that CeA ceria particles contain open pores (connected to surfaces) and closed pores (embedded in particles), while CeN ceria particles only contained closed pores. This experimental result suggests that the type of porosity is controlled by the precursors and could be related to their melting temperature during the heating process in SP.

Keywords

mesoporousspray pyrolysisceriaelectron tomographytransmission electron microscopyhigh-angle annular dark field
Type
TEM and STEM Materials Applications
Information
Microscopy and Microanalysis , Volume 17 , Issue 1 , February 2011 , pp. 54 - 60
Copyright
Copyright © Microscopy Society of America 2011

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Footnotes

Current address: Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43 Sec. 4 Keelung Road, Taipei, Taiwan 106, R.O.C.

References

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