Impact of ceramic matrix functionality on composite electrolytes performance
authors Rondao, AIB; Patricio, SG; Figueiredo, FML; Marques, FMB
nationality International
journal ELECTROCHIMICA ACTA
author keywords Ceria; Composite electrolytes; Impedance spectroscopy; Equivalent circuit
keywords PERCENT EUTECTIC MIXTURE; DOPED CERIA; CARBON-DIOXIDE; ELECTRICAL-PROPERTIES; IONIC-CONDUCTIVITY; ITSOFC APPLICATIONS; TRANSITION POINTS; SODIUM-CARBONATE; FUEL-CELLS; 973 K
abstract Ceria-based composite electrolytes (50 and 70 vol%) including one mixture of Li and Na carbonates (1:1 molar ratio) were prepared using either pure CeO2 (modest conductor) or Gd-doped ceria (excellent oxide-ion conductor) as ceramic matrix. The composite electrolytes and their phase constituents were tested under pure CO2, air, and H-2 diluted in N-2, at temperatures ranging from 300 to 580 degrees C, to study their electrical performance. Impedance spectroscopy measurements performed under these working conditions were complemented by microstructural characterization. Low temperature (below melting) impedance shows in a clear manner the relevance of the matrix functionality on the performance of these composites, but also reveals additional microstructural and even unusual composite effects. These data were used to test equivalent circuit models derived from the composite constituent properties, and to assess their potential to design composites for target functionalities at higher temperature. (C) 2013 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2013
volume 109
beginning page 701
ending page 709
digital object identifier (doi) 10.1016/j.electacta.2013.07.229
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000328006300096
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