造孔剂对SOFC阴极微观结构及性能的影响  

The Effect of Pore Former on the Microstructure and Performance of SOFC Cathode

作　　者：戴颋娴[1] 孙帮东 尹屹梅[1] 马紫峰[1] 

机构地区：[1]上海交通大学化学系,上海200240 [2]中国兵器集团214研究所苏州研发中心,江苏苏州215163

出　　处：《广州化工》2013年第12期7-9,26,共4页GuangZhou Chemical Industry

基　　金：国家自然科学基金(21173147)~~

摘　　要：考察了造孔剂的种类、尺寸、形貌等对Pr0.6Sr0.4(Co0.2Fe0.8)Sc0.05O3-δ(PSCFS)阴极电催化性能和电极微观结构的影响。通过XRD和BET表征了不同温度焙烧的PSCFS粉体的晶相结构和比表面积,用交流阻抗法和SEM检测了PSCFS/GDC/PSCFS对称电池的电化学性质和截面形貌。结果表明:乙基纤维素(EC)为造孔剂的阴极极化阻抗最小,650℃时为0.18Ω.cm-2,～2μm的球状石墨有利于降低阴极的极化阻抗。The effects of species, size, and morphology of pore formers on the microstructure and electrochemical performance of Pr0. 6 Sr0. 4 （ Co0. 2 Fe0.8 ） Sc0.05 O3-δ （ PSCFS ） solid oxide fuel cell （ SOFC ） cathode were investigated. The AC electrochemical impedance spectra measurements were carried out on PSCFS/GDC/PSCFS symmetrical cells. The cathodes with ethyl cellulose （EC） as pore former, the least polarization resistance, eg. 0. 18 Ω . cm-2 at 650 ℃, and the cathodes with - 2μm sphere graphite （GRA） pore formers showed smaller resistance than cathodes with GRA in other sizes was got. The SEM cross - sectional images of cathodes indicated that the cathodes with 1 - 2 μm macro pores and 〈 500 nm micropores showed better cathode performance.

关 键 词：固体氧化物燃料电池 阴极 造孔剂 微观结构 阴极性能 

分 类 号：TQ152[化学工程—电化学工业]