resumo
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.
palavras-chave
OXIDE FUEL-CELLS; ENHANCED IONIC-CONDUCTIVITY; PERCENT EUTECTIC MIXTURE; LOW-TEMPERATURE SOFCS; RAMAN-SPECTRA; 973 K; SOLUBILITY; SOLVATION; DIOXIDE; PART
categoria
Chemistry; Electrochemistry; Energy & Fuels
autores
Rajesh, S; Macedo, DA; Nascimento, RM; Souza, GL; Figueiredo, FML; Marques, FMB
nossos autores
Fernando Manuel Bico Marques
Professor Catedrático
Filipe Miguel H Lebre R Figueiredo
Investigador Principal
Rajesh Surendran Nair
Bolseiro de pós-DoutoramentoProjectos
NANOCELL - Nanocomposite Electrolytes for Intermediate Temperature Fuel Cells (PTDC/CTM/098486/2008)
agradecimentos
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.