Microstructure evolution of yttria-doped ceria in reducing atmosphere

Li, Zhi-Peng, Mori, Toshiyuki, Auchterlonie, Graeme John, Zou, Jin and Drennan, John (2013) Microstructure evolution of yttria-doped ceria in reducing atmosphere. Renewable Energy, 50 494-497. doi:10.1016/j.renene.2012.07.019

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Author Li, Zhi-Peng
Mori, Toshiyuki
Auchterlonie, Graeme John
Zou, Jin
Drennan, John
Title Microstructure evolution of yttria-doped ceria in reducing atmosphere
Journal name Renewable Energy   Check publisher's open access policy
ISSN 0960-1481
Publication date 2013-02
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.renene.2012.07.019
Open Access Status
Volume 50
Start page 494
End page 497
Total pages 4
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2013
Language eng
Formatted abstract
The evolution of microstructures of yttria-doped ceria (YDC) upon the heating at 500 °C in a reducing atmosphere has been characterized. Even though obvious cracks will not appear at such a low temperature, local microstructures will change in terms of superstructure formation. Electron energy-loss near-edge structure (ELNES) analysis reveals that newly appeared superstructures formation is mainly attributed to the reduction of Ce4+ to Ce3+. Furthermore, the ELNES at the oxygen K-edge illustrates that such superstructures have enhanced oxygen vacancy ordering level, compared to non-H2-treated YDC samples. This type of long-range ordered structure may act as trap/sink centers for mobile oxygen vacancies, the charge carrier of oxide ionic conductors, which is detrimental to solid oxide fuel cell performance. In the light of this study, it elucidates that microstructural evolution under an operating environment may be one possible reason for the degradation of the fuel cells.
Keyword Ceria
Electron energy loss spectroscopy
Solid oxide fuel cell
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 12 August 2012.

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