Structure and Properties of Novel Cobalt-Free Oxides NdxSr1鈥?i>xFe0.8Cu0.2O3鈭捨?/sub> (0.3 鈮?x 鈮?0.7) as Cathodes of Intermediate Temp

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• 作者：Jie-Wei Yin ; Yi-Mei Yin ; Jun Lu ; Chunming Zhang ; Nguyen Q. Minh ; Zi-Feng Ma
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：June 26, 2014
• 年：2014
• 卷：118
• 期：25
• 页码：13357-13368
• 全文大小：881K
• ISSN：1932-7455

文摘

Novel cobalt-free perovskite oxides Nd_xSr_1鈥?i>xFe_0.8Cu_0.2O_{3鈭捨?/sub> (NSFCx, 0.3 鈮?x 鈮?0.7) have been prepared and evaluated as cathodes for intermediate temperature solid oxide fuel cells (IT-SOFC). Their structure, thermal expansion, electric, and electrochemical properties are investigated. The oxides exhibit all cubic structure and show excellent thermal and electrochemical performance stability. The Nd content (x) significantly affects the properties of NSCFx. NSFC0.5 has been found to be the optimum composition with a peak electrical conductivity of 124 S cm^鈥? at 700 掳C, an average thermal expansion coefficient of 14.7 脳 10^鈥? K^鈥? over 25鈥?00 掳C, a cathodic polarization resistance (Rp) of 0.071 惟 cm² at 700 掳C, and a peak power density of 900 mW cm^鈥? at 800 掳C for samarium-doped ceria (SDC)-based single cells with NSFCx cathodes and Ni鈥揝DC anodes. Moreover, no degradation has been observed for the Rp at 700 掳C within 350 h. The concentration of surface oxygen vacancies and composition dependent crystallographic parameters have been found to be the dominating factors on performance of NdxSr1鈥?i>xFe0.8Cu0.2O3鈭捨?/sub> as IT-SOFC cathodes.}