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

doi:10.3724/SP.J.1077.2013.12626

Abstract

Abstract: Gd_0.8Sr_0.2CoO_3-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℃ to 1150℃. 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℃ and Sm_0.2Ce_0.8O_1.9 (SDC) electrolyte is mere 0.119 Ω·cm². The electrical conductivity value of Gd_0.8Sr_0.2CoO_3-δ cathode is higher than 100 S/cm in the temperature range from 500℃ to 800℃, which implies that GSC could be a promising cathode material for IT-SOFC.

Key words: cathode, glycine-nitrate process (GNP), stoichiometric coefficient, thermodynamics, electrochemical performance

CLC Number:

TM911

WANG Huan, ZHANG Hua, JIN Hong-Jian, ZHAO Wen-Wen. Effect of Fuel Amount on Synthesis of Gd_0.8Sr_0.2CoO_3-δ Cathode Material by Glycine-nitrate Process[J]. Journal of Inorganic Materials, 2013, 28(8): 818-824.

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Effect of Fuel Amount on Synthesis of Gd_0.8Sr_0.2CoO_3-δ Cathode Material by Glycine-nitrate Process

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