中温固体氧化物燃料电池Ag-BSB阴极材料制备及性能表征

Fabrication and characterization of Ag-BSB composite cathodes for intermediate temperature solid oxide fuel cells

为发展中温固体氧化物燃料电池阴极材料,固相反应法制备了 Bi0.89Ba0.11O1.445(BSB)粉,用 X- ray衍射方法考察了其成相温度,表明在700℃烧 5h,已基本成β 斜方六面体结构。并与 Ag 复合制成复合阴极,研究了烧结温度对复合阴极微结构的影响。同时以Sm0.2Ce0.8O1.9(SDC)为电解质,用交流阻抗法研究BSB含量对复合阴极的界面阻抗的影响发现,50%(体积分数)BSB时,界面阻抗最小,在650℃和 700℃时分别为0.32Ω·cm2 和 0.12Ω·cm2,比 Ag基其它复合阴极材料如Ag -SDC,Ag- YSZ的界面极化电阻要小得多。

In order to develop a cathode for IT-SOFC, Bi0.89Ba0.11O1.445 (BSB) powders were prepared using a solid-state reaction method, and calcined at 700°C for 5 h, formed to a β-rhombohedral phase. The interfacial resistances of Ag-BSB composite cathode were measured on Ce0.8Sm0.2O1.9 (SDC) electrolytes from 500°C to 700°C by AC impedance spectroscopy, and compared with other cathodes. The results showed the interfacial resistance of Ag-BSB was the smallest with the value of 0.32 Ω&middotcm2 at 650°C and of 0.12 Ω&middotcm2 at 700°C, which was much lower than that of Ag-SDC composite cathodes of 0.91 Ω&middotcm2 and 0.39 Ω&middotcm2 at the same temperature, respectively.