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

• 研究论文 • 上一篇    下一篇

Gd0.2Ce0.8O2包覆LaNi0.6Fe0.4O3-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   

  1. 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 LaNi0.6Fe0.4O3-δ Cathode Modified by Coating with Gd0.2Ce0.8O2 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   

  1. 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: 应用丝网印刷和共烧结制备LaNi0.6Fe0.4O3-δ/Sc0.1Zr0.9O1.95/LaNi0.6Fe0.4O3-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Gd0.2Ce0.8O2(GDC)包覆的LaNi0.6Fe0.4O3-δ(LNF)阴极. 实验表明,在750 oC工作温度下,纯LaNi0.6Fe0.4O3-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.

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Abstract: The symmetric cell of LaNi0.6Fe0.4O3-δ/Sc0.1Zr0.9O1.95/LaNi0.6Fe0.4O 3-δ was fabricated with screen printing method. A LaNi0.6Fe0.4O3-δ (LNF) cathode was modified by coating with nano-sized gadolinium-doped ceria (GDC, Gd0.2Ce0.8O2) 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.

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