Gd_(0.2)Ce_(0.8)O_2包覆固体氧化物燃料电池Ni-ScSZ复合阳极制备及性能表征  

Fabrication and Performance of Ni-ScSZ Cermet Anode Modified by Coating with Gd_(0.2)Ce_(0.8)O_2 for a SOFC

作　　者：刘仁柱[1] 黄波[1] 叶晓峰[1] 王绍荣[1] 曹佳弟[1] 聂怀文[1] 温廷琏[1] 

机构地区：[1]中国科学院上海硅酸盐研究所功能陶瓷研究中心,上海00050

出　　处：《电化学》2007年第1期50-57,共8页Journal of Electrochemistry

基　　金：上海市博士后基金(Grant No.06R214156)资助

摘　　要：应用双层流延法制备Ni-ScSZ阳极支撑体-ScSZ电解质复合膜素坯,经共烧结得到复合膜.以硝酸铈和硝酸钆为原料,柠檬酸作燃料,由燃烧合成法制备Gd0.2Ce0.8O2(GDC)包覆的Ni-ScSZ阳极.X-射线衍射(XRD)和电子显微镜(TEM和SEM)分析显示,Ni-ScSZ阳极颗粒表面的包覆层是由直径小于100 nm的GDC微粒构成,并与Ni-ScSZ阳极颗粒紧密烧结在一起.实验表明,2.0%(by mass)GDC包覆的Ni-ScSZ阳极具有较佳的性能,以其组装的单电池在850℃用H2或CH4作燃料的最大功率密度分别是825和848 mW/cm2,而由无包覆的Ni-ScSZ作阳极的单电池,功率密度分别是584和586 mW/cm2.由两种阳极材料组装的单电池,分别在700℃于CH4气氛下作长时间发电实验,发现2.0%(by mass)GDC包覆的Ni-ScSZ阳极比Ni-ScSZ阳极具有较好的抗碳沉积性能.A Ni-scandia-stabilized zirconia （Ni-ScSZ） cermet anode modified by coating with nano-sized gado- linium-doped ceria （ GDC, Gd0. 2 Ce0.8 O2 ） was prepared using a simple combustion process for the solid oxide fuel cell （SOFC） running on methane fuel. X-ray diffraction （XRD） and scanning electron microscopy （SEM） indicated that the surface of Ni-ScSZ was coated by nano-sized GDC particles （ 〈 100nm）. Single cell testing showed that the 2.0% （by mass） GDC-coated Ni-ScSZ anode had better performance. The highest power densities of the cell with this anode were 825 and 848mW/cm^2 at 850℃ in humidified hydrogen and methane, respectively, whereas the corresponding values were 584 and 586mW/cm2 for the cell with Ni-ScSZ anode. Electro- chemical impedance spectra （EIS） illustrated that the cell with Ni-ScSZ anode exhibited far greater impedances than the cell with 2.0% （by mass） GDC-coated Ni-ScSZ anode. Then the short-term stability for the cells with the Ni-ScSZ and 2.0% （by mass） GDC-coated Ni-ScSZ anodes in 97% CH4/3% H2O at 700℃ was checked over a relative long period of operation. No significant degradation in performance has been observed after 84 h of cell testing when 2.0% （by mass） GDC-coated Ni-ScSZ anode was exposed to 97% CH4/3% H2O at 700 ℃. Very little carbon was detected on the anodes, suggesting that carbon deposition was limited during cell operation.

关 键 词：固体氧化物燃料电池(SOFC) 甲烷氧化 阳极 碳沉积 交流阻抗 

分 类 号：TM911.4[电气工程—电力电子与电力传动]