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

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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.

keywords

OXIDE FUEL-CELLS; ENHANCED IONIC-CONDUCTIVITY; PERCENT EUTECTIC MIXTURE; LOW-TEMPERATURE SOFCS; RAMAN-SPECTRA; 973 K; SOLUBILITY; SOLVATION; DIOXIDE; PART

subject category

Chemistry; Electrochemistry; Energy & Fuels

authors

Rajesh, S; Macedo, DA; Nascimento, RM; Souza, GL; Figueiredo, FML; Marques, FMB

our authors

foto Fernando Manuel Bico Marques

Fernando Manuel Bico Marques

Full professor
foto Filipe Miguel H Lebre R Figueiredo

Filipe Miguel H Lebre R Figueiredo

Principal Researcher
foto Rajesh Surendran Nair

Rajesh Surendran Nair

Post-doc Fellowship

Groups

G3 - Electrochemical Materials, Interfaces and Coatings

Projects

NANOCELL - Nanocomposite Electrolytes for Intermediate Temperature Fuel Cells (PTDC/CTM/098486/2008)

Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2011-2012) (PEst-C/CTM/LA0011/2011)

acknowledgements

S. Rajesh and D. Macedo express their appreciation for their grants (FCT, SFRH/BPD/76226/2011, Portugal, and CAPES/PRO-ENGENHARIAS and PDEE program/BEX 6775/10-1, Brazil, respectively). Funding from Nanocell (PTDC/CTM/098486/2008) and CICECO (PEst-C/CTM/LA0011/2011), FCT/COMPETE/FEDER, Portugal, is greatly appreciated.

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Publication Details

type
Journal Article
year
2013
journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
volume
38
publisher
PERGAMON-ELSEVIER SCIENCE LTD
issn
0360-3199
issue
36
digital object identifier
10.1016/j.ijhydene.2013.05.090
web of science article identifier
WOS:000327904500075

Journal Metrics (JCR 2019)

Journal Impact Factor
4.939
Journal Impact Factor (5 yrs)
4.469
category normalized journal percentile
73.237

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