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Perovskite-type Ba0.5Sr0.5Al0.1Fe0.9O3-δ as Intermediate-Temperature Solid Oxide Fuel Cell Cathode
Yun Gan,Kui Xie*
Author NameAffiliationE-mail
Yun Gan Department of Energy Materials, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China  
Kui Xie* Department of Energy Materials, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China xiekui@hfut.edu.cn 
Abstract:
A cobalt-free perovskite-type Ba0.5Sr0.5Al0.1Fe0.9O3-δ (BSAF) is developed and electro-chemically studied as solid oxide fuel cell (SOFC) cathode. The structures, electrical con-ductivity, and electrode polarizations in symmetrical cell based on mixed ion conducting electrolyte were investigated, respectively. The temperature dependence of conductivity of BSAF in air shows a typical semiconductor behavior with positive temperature coefficient up to 450 oC where the conductivity reaches 14.0 S/cm while above this temperature the negative temperature coefficient dominates the total conductivity. Electrochemical charac-terizations show desirable polarization resistance of BSAF cathode in a symmetric cell based on mixed ion conducting electrolyte at 650-700 oC. A single SOFC with BSAF cathode shows OCV of 1.0 V and maximum output of 420 mW/cm2 at 700 oC with humidified hydrogen fuel and static air oxidant.
Key words:  Solid oxide fuel cell, Perovskite, Cathode, Cobalt-free, Mixed ionic conductor
FundProject:
钙钛矿型中温固体氧化物燃料电池阴极Ba0.5Sr0.5Al0.1Fe0.9O3-δ
甘昀,谢奎*
摘要:
研究一种新型不含钴的钙钛矿型中温固体氧化物燃料电池阴极Ba0.5Sr0.5Al0.1Fe0.9O3-δ (BSAF)材料的晶体结构、电导率以及在对称电池中的电极极化性能. 研究发现,BSAF阴极在空气中低于450 oC表现出典型的具有正温度系数的半导体行为,最高电导率达到14 S/cm;在450-750 oC,却表现出负温度系数,且电导率在750 oC下降到6 S/cm. 电化学研究表明,在基于混合离子导体的对称电池中,BSAF阴极在650-700 oC表现出良好的电极极化性能.以3%H2O/H2为燃料和空气为氧化剂,单电池在700 oC的开路电压和最大功率输出分别达到420 mW/cm2.
关键词:  固体氧化物燃料电池,钙钛矿,阴极,混合离子导体
DOI:10.1088/1674-0068/25/05/605-608
分类号: