中温固体氧化物燃料电池高氧电催化活性BaCe0.5Fe0.4Co0.1O3-δ阴极材料的研制  

Preparation of BaCe0.5Fe0.4Co0.1O3-δ Cathode with High Oxygen Electrocatalysis Activity for Intermediate Temperature Solid Oxide Fuel Cells

作　　者：操航 陈阳 朱琳 洪涛 程继贵[1] Cao Hang;Chen Yang;Zhu Lin;Hong Tao;Cheng Jigui(School of Materials Science and Engineering,Hefei University of Technology,Anhui Key Laboratory of Advanced Functional Materials and Devices,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,先进功能材料与器件安徽省重点实验室,安徽合肥230009

出　　处：《中国稀土学报》2020年第2期176-184,共9页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51802065);中国博士后科学基金项目(2018M630702)资助。

摘　　要：以Ba(NO3)2,Ce(NO3)3·6H2O,Fe(NO3)3·9H2O,Co(NO3)2·6H2O等为原料,通过EDTA-柠檬酸法合成出BaCe0.5 Fe0.4 Co0.1 O3-δ(BCFC)阴极粉体,并制得烧结体,对BCFC粉体和烧结体的相组成,微观组织和氧还原过程等进行测试分析;以BCFC作阴极,Sm0.2 Ce0.8 O2-δ(SDC)为电解质,NiO-SDC为阳极,组装对称电池和单电池,并进行电化学性能测试分析。实验结果表明:所合成的BCFC粉体原位产生BaCe0.15Fe0.75Co0.1O3-δ和BaCe0.85Fe0.05Co0.1O3-δ两相;BCFC在700℃时的表面氧交换系数(Kchem)为3.8×10^-4 cm·s^-1。对称电池在600℃的比表面电阻(ASR)为0.819Ω·cm^2,400 h长期性测试和10次热震循环试验后,ASR保持在1.6Ω·cm^2左右;单电池在700和650℃时的最大功率密度分别为290和204 mW·cm^-2,对应的开路电压分别为0.80和0.82 V。初步研究结果表明BCFC应用于中温固体氧化物燃料电池具有良好的电化学性能和稳定性。BaCe0.5Fe0.4Co0.1O3-δ(BCFC)cathode powders were synthesized by EDTA-citric acid method using Ba(NO3)2,Ce(NO3)3·6H2O,Fe(NO3)3·9H2O,Co(NO3)2·6H2O as raw materials,and were sintered.Phase composition,microstructure and oxygen reduction process of the powder and the sintered samples were investigated.Symmetrical cells and single cells based on the BCFC cathode were assembled with Sm0.2Ce0.8O2-δ(SDC)as electrolyte and NiO-SDC as anode,and their electrochemical properties were investigated.The results showed that the BCFC powders can in situ decompose into BaCe0.15Fe0.75Co0.1O3-δand BaCe0.85Fe0.05Co0.1O3-δphases.Surface oxygen exchange coefficient(Kchem)of BCFC is 3.8×10^-4 cm·s^-1 at 700℃.Area specific resistance(ASR)of the symmetrical cell is 0.819Ω·cm2 at 600℃,and after long term test and 10 times thermal vibration cycles,ASR remains stable at about 1.6Ω·cm^2.Maximum power density of the single cell reaches 290 and 204 mW·cm^-2 at 700 and 650℃,respectively,and the corresponding open circuit voltages are 0.80 and 0.82 V,respectively.The preliminary results indicated that BCFC show good electrochemical performance and stability for used as cathode materials of intermediate temperature solid oxide fuel cells.

关 键 词：固体氧化物燃料电池 钙钛矿 电化学性能 两相阴极 氧还原反应 稀土 

分 类 号：TB34[一般工业技术—材料科学与工程] TK91[动力工程及工程热物理]