中温SOFC复合阴极材料的制备及性能  

Preparation and Performance of Composite Cathode Materials for IT-SOFC

作　　者：荆波[1] 孙俊才[1] 吕喆[2] 

机构地区：[1]大连海事大学,辽宁大连116026 [2]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2010年第5期915-918,共4页Rare Metal Materials and Engineering

摘　　要：在La0.7Sr0.3Co0.95Cu0.05O3-δ中掺入不同比例的Ce0.8Sm0.2O1.9制成中温固体氧化物燃料电池(IT-SOFC)复合阴极材料,对其进行晶体结构表征和高温电导率、热膨胀系数和阴极过电位测试。结果表明,Ce0.8Sm0.2O1.9的掺入不但有效地降低了La0.7Sr0.3Co0.95Cu0.05O3-δ阴极材料的热膨胀系数,而且Ce0.8Sm0.2O1.9掺入量为10%(质量分数,下同)的样品,其电导率高于La0.7Sr0.3Co0.95Cu0.05O3-δ,并且它在相同过电位下其阴极电流密度也大于其他样品。以其为阴极的SOFC单电池,在850℃最大短路电流密度达511mA/cm2,最大输出功率密度为106mW/cm2。A composite cathode material for Intermediate Temperature Solid Oxide Fuel Cells（IT-SOFC） was prepared by adding Ce0.8Sm0.2O1.9 into La0.7Sr0.3Co0.95Cu0.05O3-δ at different ratios.The crystal structure was characterized;the high temperature conductivity,thermal expansion coefficient and overpotentials of cathode electrodes were tested.The results show that adding Ce0.8Sm0.2O1.9 effectively decreases the thermal expansion coefficient of La0.7Sr0.3Co0.95Cu0.05O3-δ.When the content of the adding of Ce0.8Sm0.2O1.9 is 10%（mass faction,similarly hereinafter）,the conductivity of the composite material is higher than that of La0.7Sr0.3Co0.95Cu0.05O3-δ and the current density of the cathode under the same overpotential is greater than that of others.A single fuel cell containing this cathode material has the maximum short-circuit current density of 511 mA/cm-2 and the maximum output power density of 106 mW /cm-2 at 850℃.

关 键 词：中温固体氧化物 燃料电池 复合阴极材料 La0.7Sr0.3Co0.95Cu0.05O3-δ Ce0.8Sm0.2O1.9 

分 类 号：TM911.4[电气工程—电力电子与电力传动]