Relevance of the ceramic content on dual oxide and carbonate-ion transport in composite membranes
authors Soares, CMC; Patricio, SG; Figueiredo, FML; Marques, FMB
nationality International
journal INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords Composite electrolytes; Ceria; Molten carbonates; CO2 separation membranes; Impedance spectroscopy
keywords CERIA-BASED COMPOSITES; DOPED-CERIA; FUEL-CELLS; DIOXIDE SEPARATION; HIGH-TEMPERATURE; PHASE MEMBRANES; ELECTROLYTES; CONDUCTIVITY; PERFORMANCE; PERMEATION
abstract Composite electrolytes based on Gd-doped ceria (from 50 to 95 vol%) and one eutectic mixture of sodium and lithium carbonates were prepared by co-firing, in order to identify the compositional range where both oxide and carbonate-ion transport are balanced, as required for high performance CO2 separation membranes. Considering the adequacy of this technique, the effects of composition and microstructure on oxide-ion transport were inspected by impedance spectroscopy. The specific features of low temperature impedance spectra allowed access to data on oxide-ion transport based on a hereby suggested equivalent circuit where the individual characteristics of both constituent phases are considered, as well as the variable nature and relevance of interfaces. Combined analysis of all information indicates that the range of interesting compositions for balanced dual ionic conduction corresponds to a ceramic phase content around 85 yo1%, for the present microstructural characteristics and a target temperature below 550 degrees C. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0360-3199
year published 2014
volume 39
issue 10
beginning page 5424
ending page 5432
digital object identifier (doi) 10.1016/j.ijhydene.2013.12.121
web of science category Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category Chemistry; Electrochemistry; Energy & Fuels
unique article identifier WOS:000334130800075
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