Microstructure and Impedance Analysis of La0.6Sr0.4Co0.2Fe0.8O3-δ for Solid Oxide Fuel Cell Cathode

doi:10.3724/SP.J.1077.2008.00719

Abstract

Abstract: Composite perovskite oxides La_1-xSr_xCo_1-yFe_yO_3-δ (LSCF) is an optional cathode material for the intermediate temperature solid oxide fuel cells. La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ powders were synthesized by a citrate method. The effects of the precursor solution pH value and the calcining temperature on the phase structure of the LSCF powders were investigated by Xray diffraction. Besides, the impacts of the precursor solution pH value and sintering temperature on the morphology and impedance characteristics of the LSCF sintered bodies were studied by SEM, AC impedance analysis, respectively. The alternatecurrent impedances of the LSCF sintered bodies were analysized based on the Voigttype equivalent circuit model.
The results show that the LSCF sintered body has the lowest impedance in the condition that the precursor solution pH is 4, the calcination temperature is 900℃, and the sintering temperature is 1400℃ for 2h, respectively.

Key words: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ, citrate method, microstructure, impedance analysis

CLC Number:

TM911

SU Dan,ZHU Man-Kang,HOU Yu-Dong,WANG Hao,YAN Hui. Microstructure and Impedance Analysis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δfor Solid Oxide Fuel Cell Cathode[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00719.

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Microstructure and Impedance Analysis of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δfor Solid Oxide Fuel Cell Cathode

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