Reducibility of Ce1-xGdxO2-delta in prospective working conditions
authors Perez-Coll, D; Marrero-Lopez, D; Ruiz-Morales, JC; Nunez, P; Abrantes, JCC; Frade, JR
nationality International
journal JOURNAL OF POWER SOURCES
author keywords gadolinium doped ceria; ion blocking; coulometric titration; electronic conductivity; reducing conditions
keywords OXIDE FUEL-CELL; NONSTOICHIOMETRIC CERIUM DIOXIDE; GD-DOPED CERIA; ELECTRONIC CONDUCTIVITY; ELECTRICAL-CONDUCTIVITY; OXYGEN NONSTOICHIOMETRY; REDUCING CONDITIONS; SOLID-SOLUTIONS; TRANSPORT; CERAMICS
abstract Nanocrystalline powders of CGO materials with different contents of Gd were prepared by a freeze-drying method and used to prepare dense ceramic samples. This method allowed one to obtain good quality samples to re-examine the reducibility of CGO materials. These materials were characterized by a combination of coulometric titration, impedance spectroscopy and ion blocking measurements to evaluate changes in point defect chemistry and mixed conducting properties. We have examined the onset of n-type conductivity as a function of temperature and oxygen partial pressure, and this information was used to re-examine the mixed transport properties in reducing conditions imposed by fuels, and also the OCV obtained with CGO solid electrolyte cells under air/CGO/fuel gradients. The polaron mobility was also evaluated and was found to depend slightly on temperature and to decrease with increasing oxygen deficiency. This confirmed that the electronic conductivity is mainly dependent on reducibility. (C) 2007 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0378-7753
year published 2007
volume 173
issue 1
beginning page 291
ending page 297
digital object identifier (doi) 10.1016/j.jpowsour.2007.04.060
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Electrochemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000250995200035
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journal impact factor 6.945
5 year journal impact factor 6.686
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