La_2Mo_(2-x)Cu_xO_(9-δ)电解质材料制备及性能研究  

Preparation and properties research of La_2Mo_(2-x)Cu_xO_(9-δ) electrolyte materials

作　　者：阳杰[1,2] 田长安 朱三娥[1] 尹奇异 李少波[1] YANG Jie;TIAN Chang-an;ZHU San-e;YIN Qi-yi;LI Shao-bo(Department of Chemical and Materials Engineering,Hefei University,Hefei Anhui 230601,China;;CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University of Science and Technology of China,Hefei Anhui 230026,China)

机构地区：[1]合肥学院化学与材料工程系,安徽合肥230601 [2]中国科技大学地球和空间科学学院中科院壳幔物质与环境重点实验室,安徽合肥230026

出　　处：《电源技术》2018年第12期1854-1856,1939,共4页Chinese Journal of Power Sources

基　　金：安徽省高等学校自然科学研究项目(KJ2018A0549);合肥学院科研发展基金重大项目(17ZR02ZDA);安徽省自然科学研究项目(1508085QB31;1708085ME112)

摘　　要：采用固相法制备系列电解质材料La_2Mo_(2-x)Cu_xO_(9-δ)(x=0,0.2,0.4,0.6),通过扫描电镜(SEM)、热重-差示扫描量热分析(TG-DSC)、X射线衍射(XRD)、电化学阻抗谱(EIS)等手段对样品进行测试表征。研究结果表明,所制备的电解质样品均已抑制了相变,在950℃烧结后能得到相对密度高于98%的致密的陶瓷烧结体。随着铜元素掺杂比例增加,氧离子电导率呈现逐渐变小的趋势,σ(x=0.6)<σ(x=0.4)<σ(x=0.2);随着晶胞的自由体积变大,氧离子的电导率变大,晶胞自由体积与氧离子的电导率呈正相关;σ[La_2Mo_(1.8)Cu_(0.2)O_(9-δ)]=27.75 mS/cm,活化能Ea[La_2Mo_(1.8)Cu_(0.2)O_(9-δ)]=1.162 eV,La_2Mo_(1.8)Cu_(0.2)O_(9-δ)有望应用于钼酸镧基燃料电池电解质材料领域。In this paper,a series of electrolyte materials La2Mo(2-x)CuxO(9-δ)(x=0,0.2,0.4,0.6)were prepared by solid state method for the first time,and tested the samples by scanning electron microscopy(SEM),X ray diffraction(XRD)and electrochemical impedance spectroscopy of the product(EIS)and other methods.The product test was inhibited by its transformation;with the doping ratio increase and the oxygen ion conductivity gradually decreases,the sequence is:σ(x=0.6)<σ(x=0.4)<σ(x=0.2).The free volume of the unit cell became larger than the oxygen ion conductivity,the free volume and the oxygen ion conductivity is positively correlated.σ[La2Mo1.8CuO.2O(9-δ)]=27.75 mS/cm,Ea[La2Mo1.8CuO.2O9-δ]=1.162 eV,La2Mo1.8CuO.2O(9-δ)is expected to show a broad application prospect and development direction in lanthanum molybdate based fuel cell electrolyte materials.

关 键 词：燃料电池 钼酸镧 固体电解质 电化学 

分 类 号：TM911[电气工程—电力电子与电力传动]