Issue 35, 2010
From the journal:

Journal of Materials Chemistry

Nanoscale compositional and structural evolution in ceria zirconia during cyclic redox treatments

Ruigang Wang,*a   Peter A. Crozierb  and  Renu Sharmac  

* Corresponding authors

a Materials Sciences Division, Lawrence Berkeley National Lab, Berkeley, CA, USA
E-mail: rgwang@lbl.gov, ruigang.wang@gmail.com
Tel: +510-486-5850

b School of Mechanical, Aerospace, Chemical and Materials Engineering, Arizona State University, Tempe, AZ, USA

c Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD, USA

Abstract

We report changes in nanoscale composition and structure in individual ceria zirconia nanoparticles (nominal composition Ce0.7Zr0.3O2), before and after redox treatment, determined by energy dispersive X-ray (EDX) analysis using scanning transmission electron microscopy (STEM) and high resolution transmission electron microscopy (HRTEM) imaging. According to the chemical analysis of individual nanoparticles, the redox treatments promote the formation of more compositionally homogenous ceria zirconia solid solution nanoparticles, resulting in a uniform low-temperature reduction. Local pyrochlore-type cation ordering in individual nanoparticles was also observed after the high temperature reduction step. For nanoparticles with 70% ceria content, redox cycling treatment was critical to obtain material which exhibits a strong low temperature reducibility. The origin of significant X-ray diffraction line broadening and particle sintering mechanism in the solid solution nanopowders are discussed based on compositional and structural variation within and between individual nanoparticles and oxygen vacancies formed during high temperature reduction treatment.

Graphical abstract: Nanoscale compositional and structural evolution in ceria zirconia during cyclic redox treatments

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Article information

DOI
https://doi.org/10.1039/C0JM01194K
Article type
Paper
Submitted
24 Apr 2010
Accepted
23 Jun 2010
First published
02 Aug 2010

J. Mater. Chem., 2010,20, 7497-7505

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Nanoscale compositional and structural evolution in ceria zirconia during cyclic redox treatments

R. Wang, P. A. Crozier and R. Sharma, J. Mater. Chem., 2010, 20, 7497 DOI: 10.1039/C0JM01194K

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