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750oC工作温度下,纯LaNi0.6Fe0.4O3-δ阴极的极化电阻为0.70Ω.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(0.13Ω.cm2),活化能最低(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.
The symmetric cell of LaNi0.6Fe0.4O3-δ/Sc0.1Zr0.9O1.95/LaNi0.6Fe0.4O3-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 Ω.cm2at 750 °C,while 0.13 Ω.cm2for 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.
出处
《电化学》
CAS
CSCD
北大核心
2013年第3期275-280,共6页
Journal of Electrochemistry
基金
国家自然科学基金(No.51201098)
教育部高等学校博士学科点专项科研基金(No.20100073120055)资助
作者简介
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