Hostname: page-component-76fb5796d-5g6vh Total loading time: 0 Render date: 2024-04-26T14:50:23.280Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Singhal, S.C.. Proc. of the 5th International Symposium on SOFC's. Eds. Stimming, U., Singhal, S.C., Tagawa, H. and Lehnert, W.. The Electrochem.Soc. (1997), p.37.Google Scholar
2. Inaba, H. and Tagawa, H.. Solid State Ionics. 83, 1 (1996).Google Scholar
3. Steele, B.C.H.. Power, J. Sources. 49, 1, (1994).Google Scholar
4. Ralph, J.M. and Kilner, J.A.. Proc. of the 2nd European SOFC Forum. Ed. Thorstensen, B.. (1996), p.773.Google Scholar
5. Gerhardt, R. and Nowick, A.S.. J. Am. Ceram. Soc. 69 (9), 641 (1986).Google Scholar
6. Kilbourn, B.T.. Cerium: A guide to its role in chemical technology. (Molycorp, Inc. 1992).Google Scholar
7. Balazs, G.B. and Glass, R.S.. Solid State Ionics. 76, 155(1995).Google Scholar
8. Ralph, J.M. and Kilner, J.A.. Proc. of the 5th International Symposium on SOFC's. Eds. Stimming, U., Singhal, S.C., Tagawa, H. and Lehnert, W.. The Electrochem.Soc. (1997), p.1021.Google Scholar
9. Maricle, D.L., Swarr, T.E. and Karavolis, S.. Solid State Ionics. 52, 173(1992).Google Scholar
10. Ralph, J.M.. Ph.D. Thesis. University of London, 1998.Google Scholar
11. Phase Diagrams for Ceramists. Vols.1–6. Eds. Reser, M.K., Smith, G., Clevinger, M.A. and Ondik, H.M.. (The American Ceramic Society. 1964–87). Figs. 26, 43, 189, 237, 336, 2095, 2284, 2298, 2367, 4368, 5122, 5141, 5143, 6361.Google Scholar
12. Rudkin, R.. Unpublished data.Google Scholar