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Received March 8, 2001
Accepted December 26, 2001
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The Effect of Multiple Doping on Electrical Conductivity of Gadolinia-Doped Ceria Electrolyte
Division of Materials Science and Engineering, Korea University, 5-1 Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea
idbanker@korea.ac.kr
Korean Journal of Chemical Engineering, May 2002, 19(3), 421-424(4), 10.1007/BF02697150
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Abstract
Combinations of two or four trivalent oxides were substituted for gadolinia up to 5 mol% in the 20 mol% gadolinia-doped ceria electrolyte as additional dopants. Most of them increased the electrical conductivity of the electrolyte but some did not. Among them (YLa)0.01Gd0.19Ce0.8O1.9 and (YSm)0.03Gd0.17Ce0.8O1.9 showed the highest electrical conductivities, respectively, at 800 ℃ and 600 ℃. These experimental results were analyzed in terms of activation enthalpy and entropy for ionic conduction. Among the various possible contributions to the activation entropy, only the configurational entropy was taken into account for the explanation.
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Kudo T, Obayashi H, J. Electrochem. Soc., 122, 142 (1975)
Lessing P, Am. Ceram. Bull., 68(5), 1002 (1989)
Maricle DL, Swarr TE, Karavolis S, Solid State Ion., 52, 173 (1992)
Maricle DL, Swarr TE, Tuller HL, "Ceria Electroltye Composition," U.S. Patent, 5,001,021 (1991)
Tsuchida K, Tanaka Y, Ifuku T, Nakao Y, Matsuda T, Nagashima S, Maeda H, Kato A, Korean J. Chem. Eng., 13(5), 478 (1996)
