Compositional and microstructural effects in composite electrolytes for fuel cells
authors Ferreira, ASV; Saradha, T; Figueiredo, FL; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF ENERGY RESEARCH
author keywords composite electrolytes; ceria; alkaline carbonates; fuel cells; ionic conductivity; microstructure
keywords LOW-TEMPERATURE SOFCS; DOPED CERIA; ITSOFC APPLICATIONS; SODIUM-CARBONATE; SOLUBILITY; CONDUCTORS; MIXTURES; POWDER
abstract Composite ionic conductors were produced by combination of alkaline carbonates with various ceramic oxides, including ceria, zirconia and alumina. The adopted mechano-thermal processing routes originated materials with the same nominal composition but with significantly different microstructures. The electrical performance of these composites, studied by impedance spectroscopy, showed the relevance of the mixed carbonate phase on the transport properties, but also unexpected composite effects. The role of grain size on the electrical performance could not be isolated from the possible influence of alkaline metal rich interfacial layers (ceramic/carbonate) consisting of nanosized 1D crystals. Modest electrode impedances in open air experiments are coherent with the coexistence of various charge carriers. The known interaction of major composite constituents and minor secondary phases with water might explain the presence of additional charge carriers. Copyright (C) 2011 John Wiley & Sons, Ltd.
publisher WILEY-BLACKWELL
issn 0363-907X
year published 2011
volume 35
issue 12
beginning page 1090
ending page 1099
digital object identifier (doi) 10.1002/er.1843
web of science category Energy & Fuels; Nuclear Science & Technology
subject category Energy & Fuels; Nuclear Science & Technology
unique article identifier WOS:000295379300008
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journal impact factor 3.009
5 year journal impact factor 2.671
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