High-performance Gd_0.2Ce_0.8O₂-impregnated LaNi_0.6Fe_0.4O_{3鈭?span style='font-style: italic'>未} cathodes for intermediate temperature solid oxide fuel cell

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• 作者：Bo Huang ; ^{huangbo2k@hotmail.com} ; Xin-jian Zhu ; Yao Lv ; Heng Liu
• 关键词：Cathode ; High performance ; Impregnation ; Solid oxide fuel cell ; Specific polarization resistance
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：1 July, 2012
• 卷：209
• 期：Complete
• 页码：209-219
• 文件大小：2752 K

摘要

High-performance LaNi_0.6Fe_0.4O_3鈭?em>未 (LNF) cathode for intermediate temperature solid oxide fuel cell is fabricated by the ion impregnation of oxygen ion conducting Gd-doped ceria (GDC, Gd_0.2Ce_0.8O₂). The microstructure of the GDC-impregnated LNF cathode is characterized by the dispersion of nano-sized GDC particles in the LNF porous framework. The particle size of the impregnated GDC phase is in the range of 40-50 nm. Uniform distribution of the nano-sized ionic conducting GDC phase significantly enhances the cathode activities for the O₂ reduction reaction. In the case of the 21.3 wt.%GDC-impregnated LNF cathode, the specific polarization resistance (R_p) is 0.13 惟 cm² at 750 掳C, a reduction by 81.43%compared with that of the pure LNF cathode at the same temperature. The results indicate that GDC impregnation has significant electrocatalytic effect on the O₂ reduction reactions on the LNF cathodes. The improved performance of GDC-impregnated LNF cathode is attributed to the extended triple-phase boundary (TPB) and enhanced oxide ion conductivity.