Synthesis and properties of CuO-doped Ce0.9Gd0.1O2-delta electrolytes for SOFCs
authors Lima, CGM; Santos, TH; Grilo, JPF; Dutra, RPS; Nascimento, RM; Rajesh, S; Fonseca, FC; Macedo, DA
nationality International
journal CERAMICS INTERNATIONAL
author keywords Gadolinia-doped ceria; Sintering aid; Microstructure; Electrical conductivity
keywords OXIDE FUEL-CELLS; SOLID ELECTROLYTES; SINTERING AID; CERIA; CEO2; CONDUCTIVITY; NANOPOWDERS; TRANSPORT; SIZE; GDC
abstract The effects of copper oxide (CuO) addition on the crystal structure, densification and microstructure of Gd-doped ceria (Ce0.9Gd0.1O2-delta, CGO) synthesized by the polymeric precursor method have been studied. Ce0.9-xGd0.1CUxO2-delta (0 <= X <= 0.01) precursor powders were calcined at 600 degrees C for 1 h and the phase formation was studied by powder X-ray diffraction combined with Rietveld refinement analysis. Relative density measurements and microstructural analysis were performed on pellets sintered in the temperature range 1000-1100 degrees C in air. The effect of CuO as a sintering aid becomes more visible when its content is in the 0.5-1 mol% range where the relative densities are found to be 98% for sintering temperature as low as 1000 degrees C. A remarkable reduction (up to similar to 500 degrees C) in the sintering temperature for 1 mol% CuO-doped CGO ceramics is observed together with the formation of a dissolved phase of Gd2O3-CeO2-CuO. Ce0.89Gd0.1Cu0.01-yO2-delta sintered at 1000 degrees C shows total electrical conductivity of 15.5 mS cm(-1) at 600 degrees C slightly higher than Ce0.9Gd0.1O2-delta sintered at 1500 degrees C (12.4 mS cm(-1)). (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0272-8842
year published 2015
volume 41
issue 3
beginning page 4161
ending page 4168
digital object identifier (doi) 10.1016/j.ceramint.2014.12.093
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000350188900109
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