IT-SOFCs阴极材料Sm_(0.8)La_(0.2)Ba_(1-x)Sr_xFe2O_(5+δ)的制备与表征  

Preparation and characterization of Sm_(0.8)La_(0.2)Ba_(1-x)Sr_xFe2O_(5+δ) bcathode materials for IT-SOFCs

作　　者：陈杨辉[1] 夏丽娜[1] 黄晓巍[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350116

出　　处：《电源技术》2015年第9期1882-1885,1894,共5页Chinese Journal of Power Sources

基　　金：福建省自然科学基金资助项目(2008J0146)

摘　　要：采用EDTA-甘氨酸联合络合法制备层状钙钛矿材料Sm0.8La0.2Ba1-xSrxFe2O5＋δ（x=0,0.25,0.50）。通过对材料晶体结构,显微形貌,电导率和电化学性能的分析,探索其作为中温固体氧化物燃料电池阴极材料的可行性。结果表明：Sr部分取代Ba并未改变材料有序层状结构。Sr的掺入提高材料电导率,随着掺入量提高,600~800℃平均电导率分别为18.35,24.85和48.20 S/cm。材料极化电阻随Sr掺入而稍微增大,较之常见无钴阴极仍较理想。700℃时,单电池功率密度分别为219.7,299.5和258.9 m W/cm2。作为初步研究成果,可知Sm0.8La0.2Ba1-xSrxFe2O5＋δ,特别是x=0.25时,可以成为有潜力的中温固体氧化物燃料电池阴极材料。Layered perovskitesSm0.8La0.2Ba1-xSrxFe2O5＋δ（x=-0, 0.25, 0.50） were synthesized by a combined EDTA-glycine complexing process. The feasibility of the sample as cathode for middle temperature SOFCs was evaluated by the analysis of crystal structure, micromorphology, conductivity and electrochemical performance. The results reveal that substitution of Sr for Ba doesn＇t change the intrinsic layered ordering structure. Sr doping improves the electrical conductivity, and the average values are 18.35, 24.85 and 48.20 S/cm with elevating Sr doping level at 600-800℃, respectively. While the polarization resistances slightly increase, which are still lower than many common cobalt free cathodes. The power densities of various single cells are 219.7, 299.5 and 258.9 mW/cm2 at 700℃, respectively. As the primary research results, Sm0.8La0.2Ba1-xSrxFe2O5＋δ, especially x =0.25, can completely be promising cathode materials for IT-SOCFs.

关 键 词：双钙钛矿 电化学性能 LnBaFe2O5+δ 无钴阴极 

分 类 号：TM911[电气工程—电力电子与电力传动]