ANM
2010
3rd
International Conference on Advanced Nano
Materials
12-15 September 2010 - Agadir, Morocco
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Abstract
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ANMM366 |
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TAILORING TRANSPORT PROPERTIES IN
CERIA BASED MATERIALS BY GRAIN BOUNDARY ENGINEERING
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D.P. Fagg1, S. Garcia
Martin2, J. Gracio1, J.R. Frade3, V.V.
Kharton3 |
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1) Nanotechnology Research Division, Centre of
Mechanical Technology and Automation (TEMA), University of AVeiro,
3810-193 Aveiro, Portugal
2) Departamento de Química Inorgánica, Facultad de
Ciencias Químicas, Universidad Complutense, Madrid-28040, Spain
3) Department of Ceramics and Glass Engineering, CICECO, University of
Aveiro, 3810-193 Aveiro, Portugal |
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Dense
ceramic samples of Ce0.8Pr0.2O2-d (CPO) and Ce0.8Gd0.2O2-d (CGO) were
obtained by the use of cobalt as a sintering aid. These additions not
only improve sinterability, making it possible to obtain ceramics with
95–99% density at 900ºC and retention of small grain sizes
(~100nm), but also cause important changes of grain boundary
properties. In this work, we will discuss some of the advantages that
this can bring for use of CGO as an electrolyte in Solid Oxide Fuel
Cells (SOFC) such as, reduction of grain boundary resistance and lower
polarisation resistance for the cathodic oxygen reduction reaction.
Similarly, for CPO, one will discuss advantages for application in
oxygen separation membranes such as, enhanced ambipolar conductivity
and enhanced oxygen surface exchange kinetics. The addition of Co-to
CPO produces a material with one of the highest levels of oxygen
permeability reported to date for single component mixed conducting
fluorite materials. |
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