Gd0.2Ce0.8O2包覆LaNi0.6Fe0.4O3-δ阴极制备及性能

doi:10.61558/2993-074X.2960

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (3): 275-280. doi: 10.61558/2993-074X.2960

Gd_0.2Ce_0.8O₂包覆LaNi_0.6Fe_0.4O_3-δ阴极制备及性能

任睿轩, 黄波^*, 朱新坚, 胡一星, 丁小益, 刘宗尧, 刘烨彬

上海交通大学机械与动力工程学院，燃料电池研究所，上海 200240

收稿日期:2012-04-24 修回日期:2012-06-05 出版日期:2013-06-28 发布日期:2013-06-28
基金资助:
国家自然科学基金(No. 51201098)和教育部高等学校博士学科点专项科研基金(No. 20100073120055)资助

Fabrication and Performance of LaNi_0.6Fe_0.4O_3-δCathode Modified by Coating with Gd_0.2Ce_0.8O₂ for Intermediate Temperature Solid Oxide Fuel Cell

REN Rui-xuan, HUANG Bo^*, ZHU Xin-jian, Hu Yi-xing, DING Xiao-yi, LIU Zong-yao, LIU Ye-bin

Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China

Received:2012-04-24 Revised:2012-06-05 Published:2013-06-28 Online:2013-06-28

摘要/Abstract

摘要： 应用丝网印刷和共烧结制备LaNi_0.6Fe_0.4O_3-δ/Sc_0.1Zr_0.9O_1.95/LaNi_0.6Fe_0.4O_3-δ对称电池. 以硝酸铈和硝酸钆为原料，柠檬酸作燃料，燃烧合成Gd_0.2Ce_0.8O₂(GDC)包覆的LaNi_0.6Fe_0.4O_3-δ(LNF)阴极. 实验表明，在750 ^oC工作温度下，纯LaNi_0.6Fe_0.4O_3-δ阴极的极化电阻为0.70 Ω·cm²，而21.3%(by mass，下同，如无特殊标注均为质量分数)GDC包覆的LNF-GDC复合阴极的极化电阻最小(0.13 Ω·cm²)，同时活化能最小(136.80 kJ·mol^-1)，故其阴极性能最佳. GDC的包覆加速了气体/阴极/电解质三相界面反应区的扩散过程，降低了阴极极化电阻.

关键词:

固体氧化物燃料电池, LaNi_0.6Fe_0.4O_3-δ阴极, Gd_0.2Ce_0.8O₂包覆, 极化电阻, 交流阻抗

Abstract: The symmetric cell of LaNi_0.6Fe_0.4O_3-δ/Sc_0.1Zr_0.9O_1.95/LaNi_0.6Fe_0.4O_3-δwas fabricated with screen printing method. A LaNi_0.6Fe_0.4O_3-δ(LNF) cathode was modified by coating with nano-sized gadolinium-doped ceria (GDC, Gd_0.2Ce_0.8O₂) prepared using a simple combustion process within the pores of the cathode. According to the electrochemical impedance spectra (EIS), the polarization resistance of the pure LNF was 0.70 W·cm² at 750 ºC, while 0.13 W·cm² for the 21.3% GDC (by mass)-coated LNF cathode at the same temperature, which was only 1/5 of that of the pure LNF cathode. The activation energy of the 21.3% GDC (by mass)-coated LNF cathode (136.80 kJ·mol^-1) is the smallest among those of GDC-coated LNF cathodes with different contents of GDC. The 21.3% GDC (by mass)-coated LNF cathode showed the optimum performance. The results indicated that GDC coatings significantly affected electrocatalytic activity of the LNF cathodes towards O2 reduction reaction. The improved performance of GDC-coated LNF cathode was attributed to the extended triple-phase boundary (TPB) and enhanced ion conductivity of oxide.

Key words:

solid oxide fuel cell, LaNi_0.6Fe_0.4O_3-δcathode, Gd_0.2Ce_0.8O₂ coating, polarization resistance, electrochemical impedance spectroscopy

中图分类号:

TM911

任睿轩, 黄波, 朱新坚, 胡一星, 丁小益, 刘宗尧, 刘烨彬. Gd_0.2Ce_0.8O₂包覆LaNi_0.6Fe_0.4O_3-δ阴极制备及性能[J]. 电化学（中英文）, 2013, 19(3): 275-280.

REN Rui-Xuan, HUANG Bo, ZHU Xin-Jian, HU Yi-Xing, DING Xiao-Yi, LIU Zong-Yao, LIU Ye-Bin. Fabrication and Performance of LaNi_0.6Fe_0.4O_3-δCathode Modified by Coating with Gd_0.2Ce_0.8O₂ for Intermediate Temperature Solid Oxide Fuel Cell[J]. Journal of Electrochemistry, 2013, 19(3): 275-280.

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Gd_0.2Ce_0.8O₂包覆LaNi_0.6Fe_0.4O_3-δ阴极制备及性能

Fabrication and Performance of LaNi_0.6Fe_0.4O_3-δCathode Modified by Coating with Gd_0.2Ce_0.8O₂ for Intermediate Temperature Solid Oxide Fuel Cell

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