Abstract
Powders of Bi2Ru2O7.3, Pb2Ru2O6.5 and Y2Ru2O7 were prepared and their reactivity with Ce0.9Gd0.1O1.95 (CGO) electrolyte powders examined. Bi2Ru2O7.3 and Pb2Ru2O6.5 reacted with CGO but Y2Ru2O7 appeared stable when heated in contact with CGO powder at 900C for 24 h. Symmetrical electrodes of Y2Ru2O7-x were deposited on CGO ceramic pellets, either by tape-casting or by electrostatic assisted chemical vapor deposition (EACVD) techniques, and cathode resistivities determined by impedance spectroscopy. Undoped Y2Ru2O7 electrodes exhibited very high area specific resistivities (ASR) at 627C (∼4000 Ωcm2), but by doping with SrO the resistivity was reduced almost 100×to 47 Ωcm2. The behavior of the Y2Ru2O7 cathodes was interpreted in terms of available oxygen ion transport data for the Gd2Ti2O7 series, and it was concluded that optimization of pyrochlore ruthenate compositions should be possible to improve further the oxygen reduction behavior of ruthenate cathodes for intermediate temperature solid oxide fuel cells.
Similar content being viewed by others
References
M. Watanabe, H. Uchida, M. Shibata, N. Mochizuki, and K. Amikura, J. Electrochem. Soc., 141, 342 (1994).
M. Sahibzada, S.J. Benson, R.A. Rudkin, and J.A. Kilner, in Proc. 11th Int. Conf. on Solid State Ionics (Hawai, Nov. 1997). To be published in Solid State Ionics (1998).
H. Sasaki, M. Susuki, S. Otoshi, A. Kajimura, and M. Ippommatsu, J. Electrochem. Soc., 139, L12 (1992).
M. Hrovat, J. Holc, and D. Kolar, Solid State Ionics, 68, 99 (1994).
M.A. Subramanian, G. Aravamudan, and G.V. Subba Rao, Prog. Solid State Chem., 15, 55 (1983).
H.S. Horowitz, J.M. Longo, H.H. Horowitz, and J.T. Lewandowski, Am. Chem. Soc. Symp. Series, 279, 143 (1985).
R.G. Egdell, J.B. Goodenough, A. Hamnett, and C.C. Naish, J. Chem. Soc., Faraday Trans. 1, 79, 893 (1983).
N.M. Markovic and P.N. Ross jr., J. Electrochem. Soc., 141, 2590 (1994).
J.D. Faktor, J.A. Kilner, and B.C.H. Steele, Proc. 2nd. European Conf. on Solid State Chemistry eds R. Metselaar, H.J.M. Heijligers and J. Schoonman (Elsevier, 1982), p. 207.
H.L. Tuller, S. Kramer, and M.A. Spears, in Proc 14th Riso Symp. on Materials Science eds F.W. Poulsen et al. (Riso National Lab., Denmark, 1993), p. 151.
M.A. Spears and H.L. Tuller, in Proc. 2nd Intl. Symp. on Ionic and Mixed Conducting Ceramics, eds T.A. Ramanarayanan, W.L. Worrell, and H.L. Tuller, ECS Proc. Vol. 94–12 (Electrochemical Society, New Jersey, USA, 1994), p. 94.
H.L. Tuller and M. Spears, in Proc. 1st European SOFC Forum, ed. U. Bossel, (ISBN 3–922–14-X, Switzerland, 1994), p. 435.
M. Pechini, US. Patent 3,330,697 (11 July, 1967).
L.A. Chick, L.R. Pederson, G.D. Maupin, J.L. Bates, L.E. Thomas, and G.J. Exarhos, Materials Lett., 10, 6 (1990).
P.A. Lane, Investigations of the Vapor Phase Growth of Oxide Films from Metal Alkoxides (Ph.D Thesis, University of London, October, 1988).
K.-L. Choy, W. Bai, and B.C.H. Steele, in SOFC-V, Proc. Vol 97–40, eds U. Stimming et al. (Electrochem. Soc., New Jersey, USA, 1997), p. 1177.
A.A. van Zomeren, E.M. Kelder, J.C.M. Marijnissen, and J. Schoonman, J. Aerosol Sci., 25, 1229.
S. Linquette-Mailley, A. Caneiro, E. Djurado, G. Mairesse, and J. Fouletier, Solid State Ionics, 107, 191 (1998).
Y. Senzaki, M.J. Hampden-Smith, T.V. Kodas, and J.W. Hussler, J. Am. Ceram. Soc., 78, 2977 (1995).
F.H. van Heuveln and H.J.M. Bouwmeester, J. Electrochem. Soc., 144, 134 (1997).
B.C.H. Steele, Solid State Ionics, 94, 239 (1997).
S.B. Adler, J.A. Lane, and B.C.H. Steele, J. Electrochem. Soc., 143, 3554 (1996).
S.J. Benson, R.J. Chater, and J.A. Kilner, in Proc. 3rd Intl. Symp. on Ionic and Mixed Conducting Ceramics, eds T.A. Ramanarayanan, W.L. Worrell, and H.L. Tuller, ECS Proc. Vol. 97–24 (Electrochemical Society, NewJersey, USA, 1997), p. 596.
J.-M. Bae, Properties of selected oxide cathodes for solid oxide fuel cell (Ph.D Thesis, University of London, May, 1996).
P. Triggs, Helvetica Physica Acta, 58, 657 (1985).
P.A. Cox, Transition Metal Oxides (Oxford, 1992).
F.P.F. van Berkel, Ruthenates: Phase Relations, Structural and Catalytic Properties, (Ph.D. Thesis, University of Leiden, Netherlands, December, 1988).
R.J. Bourchard and J.L. Gillson, Mater. Res. Bull., 6, 669 (1971).
H.M. Peacock, Solid State Oxide Chemistry of Ruthenium (Ph.D. Thesis, University of Aberdeen, November, 1988).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bae, JM., Steele, B.C.H. Properties of Pyrochlore Ruthenate Cathodes for Intermediate Temperature Solid Oxide Fuel Cells. Journal of Electroceramics 3, 37–46 (1999). https://doi.org/10.1023/A:1009962831952
Issue Date:
DOI: https://doi.org/10.1023/A:1009962831952