Role of gas-phase composition on the performance of ceria-based composite electrolytes
authors Rondao, AIB; Patricio, SG; Figueiredo, FML; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Composite electrolytes; Intermediate temperature fuel cells; Impedance spectroscopy; Ceria
keywords PERCENT EUTECTIC MIXTURE; LOW-TEMPERATURE SOFCS; CARBON-DIOXIDE; DOPED CERIA; ITSOFC APPLICATIONS; FUEL-CELLS; 973 K; SOLUBILITY; CONDUCTORS; SOLVATION
abstract Ceria-based composites (ranging from 30 to 70 vol%) including a mixture of Li and Na carbonates (1:2 M ratio, respectively) were sequentially exposed to pure CO2, O-2 and a mixture of 10 vol% H-2 diluted in N-2, at temperatures ranging from 300 to 580 degrees C, to study the role of composite/gas interaction on electrical performance. Impedance spectroscopy measurements performed under these working conditions were complemented by microstructural and structural characterization. Changes in conductivity and electrode impedance when changing the atmosphere from CO2 to O-2 and to H-2 confirmed changes in concentration and/or in mobility of charge carriers and electroactive species. Novel species identified either by X-ray diffraction (hydrated carbonates, only present at the surface of the samples), or by infrared spectroscopy (hydrogen carbonate ions), might be related to the observed conductivity enhancement under H-2. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2013
volume 38
issue 14
beginning page 5497
ending page 5506
digital object identifier (doi) 10.1016/j.ijhydene.2013.02.105
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000319232500001
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