低温SOFC的SDC-碳酸盐复合物电解质  

SDC-carbonate composite electrolytes for low-temperature SOFC

作　　者：邸婧[1] 陈明鸣[1] 王成扬[1] 范良栋[1] 朱斌[2] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072 [2]瑞典皇家工学院

出　　处：《电源技术》2011年第2期144-147,共4页Chinese Journal of Power Sources

基　　金：天津市自然科学基金项目(07jcybjc02500)

摘　　要：采用钐掺杂的氧化铈(SDC)-碳酸盐复合物作为低温固体氧化物燃料电池电解质。分别采用燃烧法和共沉淀法制备SDC,记为NSDC和CSDC。将这两种SDC分别与Li2CO3-Na2CO3二元共熔物复合制备了SDC-碳酸盐复合电解质材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和电导率测试对两种复合电解质材料的结构、形貌和电性能进行了表征,并考察了燃料电池输出性能。结果表明,氧化物的制备方法影响复合电解质的形貌和电性能;复合大大提高了电解质的电导率,复合电解质的电导率在碳酸盐熔融点附近突然增大;NSDC-碳酸盐复合物具有更高的电导率,以H2和空气为燃料和氧化气体的电池性能测试显示,600℃时开路电压为1.02V,最大比功率为473mW/cm2。Samarium doped ceria（SDC）-carbonate composites were developed as the electrolytes for low temperature solid oxide fuel cells.SDC powders were synthesized by combustion and co-precipitation processes,respectively,and denoted as NSDC and CSDC.The composite electrolytes consisting of SDC derived from these two methods and binary carbonates（Li2CO3-Na2CO3） were prepared.The structure,morphology and electrical property were examined by X-ray diffraction,scanning electron microscope and conductivity measurements.The results show that the morphology and electrical property are affected by the different oxide powders.The conductivity is greatly improved and sharply increased at the temperature close to the melting point of the carbonates.The composite electrolyte made of NSDC exhibits higher conductivity than the other composite.With H2 as fuel and air as oxidant,the fuel cell based on NSDC-carbonate electrolyte exhibits an open circuit voltage of 1.02 V and the maximum power density of 473 mW/cm2 at 600 ℃.

关 键 词：SDC 碳酸盐 复合电解质 低温固体氧化物燃料电池(LTSOFC) 

分 类 号：TM911.4[电气工程—电力电子与电力传动]