Synthesis and characterization of Ga-doped Ba3MoNbO8.5 electrolytes for intermediate temperature-solid oxide fuel cells

被引：8
作者：
Liao, Dongliang [1 ]
Lin, Gurong [1 ]
Chen, Feng [1 ]
Pan, Xian [1 ]
Peng, Kaiping [1 ]
机构：
[1] Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350116, Fujian, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2022年 / 48卷 / 04期
关键词：
Ba; 3; MoNbO; 8; 5; Solid oxide fuel cells; Electrolyte; Sol -gel method; Oxide ion conductivity; ELECTRICAL-PROPERTIES; IONIC-CONDUCTIVITY; HIGH-PERFORMANCE; GEL PROCESS; CERIA; COMPOSITE; COORDINATION; EVOLUTION; MEMBRANES; SAMARIUM;
D O I：
10.1016/j.ceramint.2021.10.240
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ba3MoNb1-xGaxO8.5-delta (BMNG, 0 < x < 0.2) powders are successfully prepared by sol-gel autoignition method. The effects of acceptor-type Ga3+ doping on Ba3MoNbO8.5 (BMN) are characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscope, Raman spectroscopy, and electrochemical impedance spectroscopy. All BMNG samples crystallize as a single phase in the R-3m space group and show great phase stability at various environments. Doping a small amount of gallium can effectively improve bulk conductivity and sintering density of BMN. The ionic conductivity of Ba3MoNb0.9Ga0.1O8.5-delta (BMNG10) is the highest, which can reach 2.05 x 10-2 S cm- 1 at 800 degrees C. The enhanced ionic conductivity is primarily related to the increase of oxygen vacancy concentration and the number of tetrahedral units within the structure. In addition, through successfully assembling and evaluating a single cell supported by the BMNG10 electrolyte, it is proved that the practical utilization of BMNG10 in intermediate temperature-solid oxide fuel cells (IT-SOFCs) is feasible. In short, hexagonal perovskite derivative BMNG10 is a promising oxide ion conductor for IT-SOFCs.
引用
收藏
页码：4545 / 4553
页数：9
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