High oxygen permeability in fluorite-type Ce0.8Pr0.2O2-delta via the use of sintering aids
authors Fagg, DP; Shaula, AL; Kharton, VV; Frade, JR
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords oxygen permeability; fluorite; mixed conductor; cerium-praseodymiumoxide; sintering aids
keywords CERIA SOLID-SOLUTIONS; ELECTRONIC TRANSPORT; PEROVSKITE MEMBRANES; MIXED CONDUCTORS; MICROSTRUCTURE; CONDUCTIVITY; AVAILABILITY; KINETICS; OXIDES; CELLS
abstract Minor (2mol%) additions of cobalt oxide are highly effective as a sintering additive for the fluorite material Ce0.8Pr0.2O2-delta allowing dense materials to be formed at 1000 degrees C with sub-micron grain size. The addition gives slightly enhanced total conductivity due to an enhanced electronic conductivity of around two to three times, whilst the level and nature of ionic conductivity is unaffected. This produces a decrease in ionic transference number, an increase in the ambipolar conductivity and importantly a decrease in oxygen surface exchange limitations. The combination of these effects boosts the level of oxygen permeability offered by this fluorite material to levels that can compete with some of the best perovskite oxygen permeation membranes at intermediate temperatures, (< 850 degrees C), in a material that offers good redox stability. As such, the material Ce0.8Pr0.2O2-delta containing minor (2 mol%) additions of cobalt oxide offers one of the highest levels of oxygen permeability reported to date for a single component, mixed conducting, fluorite material. (c) 2007 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
year published 2007
volume 299
issue 1-2
beginning page 1
ending page 7
digital object identifier (doi) 10.1016/j.memsci.2007.04.020
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000248430400001
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journal impact factor 6.578
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