La0.7Sr0.3MnO3-Sm0.2Ce0.8O1.9阴极对氧化锆薄膜燃料电池性能的影响  

Effect of La0.7Sr0.3MnO3-Sm0.2Ce0.8O1.9 cathode on the performance of zirconia film fuel cell

作　　者：陈孔发[1] 吕喆[1] 陈相君[1] 艾娜[1] 黄喜强[1] 苏文辉[1] 

机构地区：[1]哈尔滨工业大学物理系,黑龙江哈尔滨150001

出　　处：《功能材料》2007年第A04期1477-1480,共4页Journal of Functional Materials

基　　金：基金项目：国家高技术研究发展计划（863计划）资助项目（2007AA052139）

摘　　要：采用固相混合法和浸渍法分别在阳极支撑的氧化钇稳定的氧化锆（YSZ）薄膜上制备了La0.7Sr0.3MnO3（LSM）-Sm0.2Ce0.8O1．9（SDC）复合阴极。结果表明，使用浸渍阴极的单电池获得更好的输出性能；但浸渍阴极的孔隙率较低，在高温区容易出现浓差极化现象。通过降低浸渍阴极的厚度，可以有效地提高电极的气体扩散速率,通过调整浸渍电极的厚度，可以在不同温度下获得理想的电池性能。采用4μm厚浸渍阴极的单电池，800℃的最高功率密度为1100mW／cm^2；采用28μm厚浸渍阴极的单电池，600℃的最高功率密度为295mW／cm^2。La0.7Sr0.3MnO3 （LSM）-Sm0.2Ce0.8O1.9 （SDC） composite cathodes were fabricated on anode-supported yttria-stabilized zirconia （YSZ） films by solid-state mixing and impregnation methods, respectively. The results showed that the single cell based on the cathode fabricated by the impregnation process produced a better output performance. At the same time, electrode concentration polarization was readily observed due to insufficient cathode porosity at high operating temperatures. Through lowering the cathode thickness, the gas transport rate at the cathode was promoted effectively. Considerable cell performance could be achieved at various temperatures by using the impregnated cathode with varied thickness. Using a 4μm-thick impregnated cathode, the single cell yielded a maximum power density of 1100 mW/cm^2 at 800℃. On the other hand, using a 28μm-thick impregnated cathode, the single cell yielded a maximum power density of 295 mW/cm^2 at 600℃.

关 键 词：La0.7Sr0.3MnO3-Sm0.2Ce0.8O1.9复合阴极 固相混合法 浸渍法 孔隙率 有效阴极厚度 

分 类 号：TM911.4[电气工程—电力电子与电力传动]