Synthesis and characterization of composite electrolytes based on samaria-doped ceria and Na/Li carbonates

authors	Lapa, CM; Figueiredo, FML; de Souza, DPF; Song, L; Zhu, B; Marques, FMB
nationality	International
journal	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords	Composite electrolytes; Samaria-doped ceria; Alkali carbonates; Nanosized ceria; Microstructural characterization; Impedance spectroscopy
keywords	ITSOFC APPLICATIONS; IONIC-CONDUCTIVITY; FUEL-CELL; CONDUCTORS; POWDER
abstract	Samaria-doped ceria-based composites with a 2:1 addition of Li and Na carbonates (or simple Na carbonate as admixture) were prepared mixing nanosized powders of the ceramic phase with the remaining constituents. Samples fired at relatively low temperatures (below 700 degrees C) were characterized by X-ray diffraction, scanning electron microscopy combined with energy dispersive spectroscopy and impedance spectroscopy in air. These composites showed a complex but homogeneous distribution of both phases, with one ceramic skeleton of bonded nanosized grains surrounded by the carbonate-based phase. Impedance spectroscopy data was used to confirm the impressive electrical conductivity of these materials, but also to put into evidence the complex nature of the charge transport process, clearly deviating from classical electrolytes. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
publisher	PERGAMON-ELSEVIER SCIENCE LTD
issn	0360-3199
year published	2010
volume	35
issue	7
beginning page	2953
ending page	2957
digital object identifier (doi)	10.1016/j.ijhydene.2009.05.036
web of science category	Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category	Chemistry; Electrochemistry; Energy & Fuels
unique article identifier	WOS:000276692800072