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Effect of Fuel Amount on Synthesis of Gd0.8Sr0.2CoO3-δ Cathode Material by Glycine-nitrate Process

Author(s): WANG Huan, ZHANG Hua, JIN Hong-Jian, ZHAO Wen-Wen

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 8;
Start page: 818;
Date: 2013;
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Keywords: cathode; glycine-nitrate process (GNP); stoichiometric coefficient; thermodynamics; electrochemical performance

Gd0.8Sr0.2CoO3-δ (GSC) nano-powders as cathode materials were synthesized by glycine-nitrate process (GNP) with different glycine-to-metal ratios (G/M=1.5, 2.0, 2.5, 3.0, 3.5). The performance of GSC cathode calcined at different temperatures was characterized by XRD, SEM and AC impedance spectra. The actual flame temperatures of combustion measured ranging from 850¡æ to 1150¡æ. The flame temperature for the sample of G/M 2.5 is the highest because of the most sufficient combustion which is in agreement with the calculation result of the ideal stoichiometric ratio (φ=1). Meanwhile, the fluffy foamy powder is obtained with fine grain size. Analysis of the AC impedance spectra shows that the area specific resistance (ASR) between GSC-2.5 cathode prepared at 1100¡æ and Sm0.2Ce0.8O1.9 (SDC) electrolyte is mere 0.119 Ω·cm2. The electrical conductivity value of Gd0.8Sr0.2CoO3-δ cathode is higher than 100 S/cm in the temperature range from 500¡æ to 800¡æ, which implies that GSC could be a promising cathode material for IT-SOFC.
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