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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14110

Title: Correlation between microstructure and electrical conductivity in composite electrolytes containing Gd-doped ceria and Gd-doped barium cerate
Authors: KHANDELWAL, M
VENKATASUBRAMANIAN, A
PRASANNA, TRS
GOPALAN, P
Keywords: YTTRIA-STABILIZED ZIRCONIA
LOW-TEMPERATURE SYNTHESIS
OXIDE FUEL-CELLS
IONIC-CONDUCTIVITY
IMPEDANCE SPECTROSCOPY
BACE0.9GD0.1O2.95
CONDUCTORS
TRANSPORT
CERAMICS
SYSTEM
Issue Date: 2011
Publisher: ELSEVIER SCI LTD
Citation: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,31(4)559-568
Abstract: 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.
URI: http://dx.doi.org/10.1016/j.jeurceramsoc.2010.10.027
http://dspace.library.iitb.ac.in/jspui/handle/100/14110
ISSN: 0955-2219
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