One-step synthesis of composite electrolytes of Eu-doped ceria and alkali metal carbonates

authors	Rajesh, S; Macedo, DA; Nascimento, RM; Souza, GL; Figueiredo, FML; Marques, FMB
nationality	International
journal	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
author keywords	Composite electrolytes; Ceria; Electrical conductivity; One-step synthesis
keywords	OXIDE FUEL-CELLS; ENHANCED IONIC-CONDUCTIVITY; PERCENT EUTECTIC MIXTURE; LOW-TEMPERATURE SOFCS; RAMAN-SPECTRA; 973 K; SOLUBILITY; SOLVATION; DIOXIDE; PART
abstract	Europium-doped ceria (EDC, Ce0.9Eu0.1O2-delta)/alkaline carbonate (LNC, (Li,Na)(2)CO3) composite ceramics prepared through a one-step citrate-based route were analyzed by powder X-ray diffraction, infrared and laser Raman spectroscopies as well as scanning and transmission electron microscopy. The electrochemical behavior of the electrolyte material was studied by impedance spectroscopy in air, CO2 and N-2 + H-2 (90/10 vol%, respectively) gas mixtures, in the temperature range 300-600 degrees C. The sub micrometric and even nanosized ceramic particles appeared as merged inside the mixed carbonates, with modest grain to grain necking. The EDC/LNC composite electrolytes showed a conductivity of 0.27 S cm(-1) at 600 degrees C in air, amongst the best ever reported, exceeding the usual requirements for fuel cell applications. 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	36
beginning page	16539
ending page	16545
digital object identifier (doi)	10.1016/j.ijhydene.2013.05.090
web of science category	Chemistry, Physical; Electrochemistry; Energy & Fuels
subject category	Chemistry; Electrochemistry; Energy & Fuels
unique article identifier	WOS:000327904500075