A series of alkali metal elements doped La2Ce2O7 electrolytes for solid oxide fuel cells

被引:19
作者
Zhang, Mohan [1 ,2 ]
Wang, Di [1 ,2 ]
Miao, Lina [1 ,2 ]
Jin, Zongzi [1 ,2 ]
Dong, Kuan [1 ,2 ]
Liu, Wei [1 ,2 ,3 ]
机构
[1] Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Hefei 230026, Peoples R China
[3] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
基金
中国国家自然科学基金;
关键词
Alkali metal element doping; Electrochemical performance; Lanthanum-cerium oxide; Solid oxide fuel cells; HIGH-PERFORMANCE; PROTON CONDUCTOR; SM; DY;
D O I
10.1016/j.elecom.2021.107026
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A series of alkali metal elements (like Li, Na, K, Rb, Cs) doped La2Ce2O7 were prepared by a citrate combustion method. We systematically investigated the effects of doping from several aspects, such as structure, conductivity, morphology and performance. All powders of La1.85M0.15Ce2O7-8 (M = Li, Na, K, Rb, Cs) have fluorite structures. The electrical conductivity first increases with the increase of ion radius of doped alkali element, and then decreases with the doping of Cesium. La1.85Rb0.15Ce2O7-8 exhibits the highest conductivity of 3 x 10-3 S cm-1 in dry air and 6.21 x 10-3 S cm-1 in wet H2 at 800 ?C. La1.85Rb0.15Ce2O7-8-based single cell exhibits the highest peak power performance with 1031 mWcm-2 at 700 ?C and the stable discharge time of it is more than 200 h. Thus, Rb-doping La2Ce2O7 material is considered as a promising electrolyte in solid oxide fuel cell.
引用
收藏
页数:5
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