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Correlation between microstructure and electrical conductivity in composite electrolytes containing Gd-doped ceria and Gd-doped barium cerate

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Title Correlation between microstructure and electrical conductivity in composite electrolytes containing Gd-doped ceria and Gd-doped barium cerate
 
Creator KHANDELWAL, M
VENKATASUBRAMANIAN, A
PRASANNA, TRS
GOPALAN, P
 
Subject YTTRIA-STABILIZED ZIRCONIA
LOW-TEMPERATURE SYNTHESIS
OXIDE FUEL-CELLS
IONIC-CONDUCTIVITY
IMPEDANCE SPECTROSCOPY
BACE0.9GD0.1O2.95
CONDUCTORS
TRANSPORT
CERAMICS
SYSTEM
Composite
Ceria
Impedance spectroscopy
Electrical conductivity
Fuel cell
 
Description Composite electrolytes with nominal compositions, Ce(0.8)Gd(0.2)O(1.9) + xBaO (x = 0.2 and 0.3), have been synthesized through the citrate route. Formation of two phases, namely Gd-doped ceria and Gd-doped barium cerate, has been confirmed through XRD and SEM studies. The impedance spectra show three distinct semi-circles, all originating from the composite electrolytes. In the temperature range 175-350 degrees C, the activation energies for the conductivity values extracted from the high frequency and intermediate frequency parts of the impedance spectra remains the same, irrespective of compositional and micro-structural variation. On the other hand, the activation energies for the conductivity values associated with the low frequency impedance spectra show a significant change with micro-structural variation. Solid oxide fuel cells constructed using these composite electrolytes exhibit a higher open circuit voltage compared to those based on single phase 20 mol% Gd-doped ceria. (C) 2010 Elsevier Ltd. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2012-06-26T07:15:33Z
2012-06-26T07:15:33Z
2011
 
Type Article
 
Identifier JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,31(4)559-568
0955-2219
http://dx.doi.org/10.1016/j.jeurceramsoc.2010.10.027
http://dspace.library.iitb.ac.in/jspui/handle/100/14110
 
Language English