LaNi_0.6Fe_0.4O₃–Ce_0.8Sm_0.2O_1.9–Ag composite cathode for intermediate temperature solid oxide fuel cells

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• 作者：Shouguo Huang ; ^a ; ^{huangsg@ustc.edu"" rel=""nofollow} ; Shuangjiu Feng^a ; Hong Wang^a ; Yide Li^a ; Chunchang Wang ; ^a ; ^{ccwang@ahu.edu.cn"" rel=""nofollow}
• 关键词：Solid oxide fuel cell ; Cathode ; Area specific resistance ; Infiltration
• 刊名：International Journal of Hydrogen Energy
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：36
• 期：17
• 页码：10968-10974
• 全文大小：782 K

文摘

LaNi_0.6Fe_0.4O₃ (LNF), LNF–Sm_0.2Ce_0.8O_1.9 (SDC), and LNF–SDC–Ag cathodes on SDC electrolytes were investigated at intermediate temperatures using AC impedance spectroscopy. Results show that adding 50 wt. % SDC into LNF yields a significant low area specific resistance (ASR) which was found to be 0.92 Ω cm² at 700 °C. Infiltrating 0.3 mg/cm² Ag into LNF-50 wt. % SDC can improve the electronic conductivity and oxygen exchange reaction activity, and thereby remarkably decrease the ASRs. The ASR value of the LNF–SDC–Ag cathode is as low as 0.18 Ω cm² at 700 °C, and 0.46 Ω cm² at 650 °C. The long-term test shows that the LNF–SDC–Ag cathode may be a promising candidate for solid oxide fuel cells operating at temperatures lower than 650 °C.