Abstract
Small (2 mol%) cobalt oxide additions to ceria-gadolinia (CGO) materials considerably improve sinterability, making it possible to obtain ceramics with 95–99% density and sub-micrometre grain sizes at 1,170–1,370 K. The addition of Co causes a significant shift of the electrolytic domain to lower pO2. This modification to the minor electronic conductivity of the electrolyte material has influence on the cathodic oxygen reduction reaction. The impedance technique is shown to provide information not only about polarisation resistance, but also about the active electrode area from analysis of the current constriction resistance. It is demonstrated that this current constriction resistance can be related to the minor electronic contributions to total conductivity in these materials. A simple imbedded grid approach gives control of the contact area allowing the properties of the electrolyte materials to be studied. A much lower polarisation resistance for the Co-containing CGO electrolyte is observed, which can be clearly attributed to an increased three-phase reaction area in the Co-containing material, as a consequence of elevated p-type conductivity.
Similar content being viewed by others
References
Steele BCH (2000) Solid State Ionics 129:95
Huijsmans JPP (2001) Curr Opin Solid State Mater Sci 5:317
Yamamoto O (2000) Electrochim Acta 45:2423
Christie GM, van Berkel FPF (1996) Solid State Ionics 83:17
Hong SJ, Mehta K, Virkar AV (1998) J Electrochem Soc 145:638
Kleinlogel C, Gaukler LJ (1999) Nano sized ceria solid solutions for intermediate temperature solid oxide fuel cells. In: Singhal SC and Dokiya M (eds) 6th Int Symp of Solid Oxide Fuel Cells (SOFC VI) PV99–19. The Electrochemical Society, Pennington, N.J., p 225
Kleinlogel C, Gauckler LJ (2000) Solid State Ionics 135:567
Tianshu Z, Hing P, Huang H, Kilner J (2001) Mater Sci Eng B 83:235
Fagg DP, Kharton VV, Frade JR (2002) J Electroceram 9:199
Fagg DP, Abrantes JCC, Coll DP, Nùñez P, Kharton VV, Frade JR (2003) Electrochim Acta 48:1023
Kharton VV, Naumovich EN, Vecher AA (1999) J Solid State Electrochem 3:61
Steele BCH, Hori KM, Uchino S (2000) Solid State Ionics 135:445
Bohac P, Orliukas A, Gauckler LJ (1995) Lowering of the cathode overpotential of SOFC by electrolyte doping. In: Waser R (ed) Proc Int Conf “Electroceramics IV”, vol. 2. Augustinus Buchhandlung, Aachen, p.771
Thampi KR, McEvoy AJ, Van herle J (1995) J Electrochem Soc 142:506
Kharton VV, Figueiredo FM, Navarro L, Naumovich EN, Kovalevsky AV, Yaremchenko AA, Viskup V, Carneiro A, Marques FMB, Frade JR (2001) J Mater Sci 36:1105
Navarro LM, Marques FMB, Frade JR (1997) J Electrochem Soc 144:267
Mather GC, Fagg DP, A.Ringuedé A, Frade JR (2001) Fuel Cells 1:1
Gorelov VP (1988) Elektrokhimiya 24:1380 (in Russian)
Sasaki K, Wurth J-P, Gschwend R, Gödickemeier M, Gauckler LJ (1996) J Electrochem Soc 143:530
Bieberle A, Meier LP, Gaukler LJ (2001) J Electrochem Soc 148(6):A646
Gharbage B, Marques FMB, Frade JR (2000) Solid State Ionics 136/137:933
Lauret H, Hammou A (1996) J Eur Ceram Soc 16:447
Fleig J, Pham P, Sztulzaft P, Maier J (1998) Solid State Ionics 113:739
Fleig J, Maier J (1997) The influence of inhomogeneous potential distributions on the electrolyte resistance in solid oxide fuel cells. In: Stimming U, Singhal SC, Tagawa H, Lehnert W (eds) Proc 5th Int Symp on Solid Oxide Fuel Cells, PV 97–40. Aachen, Germany, p 1374
Acknowledgements
This work was supported by the FCT, Portugal (PRAXIS program and the contracts SFRH/BPD/3529/2000 and POCTI/CTM/39381/2001).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Fagg, D.P., Kharton, V.V. & Frade, J.R. Transport in ceria electrolytes modified with sintering aids: effects on oxygen reduction kinetics. J Solid State Electrochem 8, 618–625 (2004). https://doi.org/10.1007/s10008-004-0509-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10008-004-0509-x