硅酸盐学报

La_0.8–xBa_xSr_0.2Co_0.8Fe_0.2O_3–δ 阴极材料的结构与性能

作者：周芬姚学君郜建全包金小宋希文安胜利

分类号：TM911.4

出版年,卷(期):页码：2015,43(11):1517-1524

DOI：10.14062/j.issn.0454-5648.2015.11.02

摘要：

采用溶胶–凝胶法制备了La0.8–xBaxSr0.2Co0.8Fe0.2O3–δ (LBSCF)阴极粉体。对LBSCF 的晶体结构、材料表面的化学状态、烧结体的断面微结构及电导率进行了表征。用交流阻抗谱法在550~700℃范围测试了LBSCF-30%SDC(Sm0.2Ce0.8O1.9)复合阴极的电化学性能。结果表明：LBSCF 粉体主晶相为六方晶系钙钛矿结构，存在少量的第二相。XPS 结果显示，Ba2+掺杂不影响A 位离子(La3+、Ba2+、Sr2+)的价态，但对B 位离子的价态有不同的影响：x=0.10 的样品中，钴离子以Co3+和Co4+混合价态存在，其余样品中以低氧化态(Co3+和Co2+混合价)或Co3+价存在；铁离子以高氧化态(Fe3+和Fe4+)存在。在500~700℃空气气氛中，LBSCF 的电导率均超过700 S/cm，在同一温度下，电导率随着Ba2+掺杂量的增加而增大。x=0.20 的样品在500 ℃时，电导率最大可达1.59×103S/cm。随着Ba2+含量增加，极化电阻减小，x=0.20 时，复合阴极LBSCF-30%SDC 的极化电阻最小，700 ℃时的极化电阻为0.20 Ω·cm2。

The cathode powder of La0.8–xBaxSr0.2Co0.8Fe0.2O3–δ(LBSCF) was prepared by a sol–gel method. The crystalline structure,cross-section microstructure, surface chemical states, and electrical properties of the sintered samples were characterized. Theelectrochemical properties of the interfaces between LBSCF–30%SDC (Sm0.2Ce0.8O1.9) composite cathodes and SDC electrolyte wereinvestigated via AC impedance spectroscopy at 550–700 ℃. The results of X-ray diffraction show that the main crystal phase ofLBSCF powder exhibits a perovskite structure with a hexagonal system, however, the trace of other phases also appears. According tothe X-ray photoelectron spectra, the doping of Ba2+ has no influence on the chemical states of A-site cations, but has some effects onthe chemical states for B-site ions. Co ions exist in a mixed oxidation state (i.e., Co3+ and Co4+) for the sample with x=0.10, while Coions are prone to low oxidation state (i.e., Co3+ and Co2+) for the other samples. Fe ions in the LBSCF exist in high oxidation states(i.e., Fe3+ and Fe4+). The electrical conductivity of the LBSCF is greater than 700 S/cm at 500–700℃ in air, which increases withincreasing Ba2+contents at the same temperature。The LBSCF (x=0.20) cathode exhibits the maximum conductivity of 1.59×103 S/cmat 500 ℃. The electrode polarization resistance decreases with increasing Ba2+ content. The minimum polarization resistance of theLBCFC-30%SDC composite cathode (when x=0.20 ) on SDC electrolyte is 0.20 Ω·cm2 at 700℃.

基金项目：

内蒙古自治区高等学校科学研究项目(NJZY14168)；国家自然科学基金项目(1474133，51464038)。

作者简介：

第一作者：周芬(1973—)，女，硕士，副教授。

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