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Electrochemical Characterization of Mixed Conducting Ba(Ce1-(x+y)PryGdx)O3-x/2 Cathodes

Published online by Cambridge University Press:  15 February 2011

R. Mukundan ,
P. K. Davies  and
W. L. Worrell
R. Mukundan
Affiliation:
Department of Materials Science, University of Pennsylvania, Philadelphia, PA 19104–6272
P. K. Davies
Affiliation:
Department of Materials Science, University of Pennsylvania, Philadelphia, PA 19104–6272
W. L. Worrell
Affiliation:
Department of Materials Science, University of Pennsylvania, Philadelphia, PA 19104–6272
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Abstract

The high protonie conductivities of barium cerium gadolinium perovskites (Ba(Ce1-xGdx)O3-x/2, O < x < 0.2) has led to their incorporation as electrolytes in fuel cells operating at 873–1073K. In an effort to develop new mixed-conducting electrodes that are compatible with the cerate electrolyte, we have examined the electrochemical properties of Pr-doped barium gadolinium cerate. The Pr doping increases the electronic contribution to the total conductivity and for Ba(Ce0.5Pr04Gd0.1)O2.95, a conductivity exceeding ≈ 0.1 S/cm at 1173K in dry air has been obtained. EMF measurements indicate the presence of both protonie and oxygen ionic contributions to the conductivity in the Pr substituted samples. The cathodic overpotentials of Ba(Ce1-(x+y)PryGdx)O3-x/2 mixed conductors on a Ba(Ce0.8Gd0.2)O2.9 electrolyte have been measured. Ba(Pr0.8Gd0.2)O2.9 has the best cathodic performance and could be a viable alternative to Pt cathode for a barium cerate based fuel cell.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 573
Copyright
Copyright © Materials Research Society 1997

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References

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