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Improving Gd-Doped Ceria Electrolytes for Low Temperature Solid Oxide Fuel Cells

Published online by Cambridge University Press:  10 February 2011

J. M. Ralph ,
J. A. Kilner  and
B. C. H. Steele
J. M. Ralph
Affiliation:
Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, ralph@cmt.anl.gov
J. A. Kilner
Affiliation:
Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, ralph@cmt.anl.gov
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Abstract

Gadolinia-doped ceria electrolyte is being investigated as an alternative electrolyte for solid oxide fuel cells operating at temperatures below 700°C. Measurements were made to determine the effects that small additions of Ca, Pr and Fe to gadolinia-doped ceria have on the bulk and grain boundary conductivities. These small additions (1–2%) of dopant did not alter the bulk conductivity significantly but resulted in a large increase in the grain boundary conductivity. The grain boundary conductivity was similar for all three electrolyte compositions. These results are explained by the possible formation of second phases at the grain boundary, which can incorporate impurity elements. The electronic conductivity in these electrolyte materials was also evaluated, but it was found that the Ca, Pr and Fe additions do not reduce the electronic conductivity compared to a standard Gd-doped ceria sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 575: Symposium CC – New Materials for Batteries & Fuel Cells , 1999 , 309
Copyright
Copyright © Materials Research Society 2000

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References

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