(Ce0.9Gd0.1O2-δ/ZrO2:8%(摩尔分数)Y2O3)n超晶格电解质薄膜的制备与特性  

Preparation and properties of the superlattice(GDC/YSZ)_n electrolyte film

作　　者：苏海莹[1] 贾晓静[1] 许彦彬[1] 刘华艳[1] 刘超 丁铁柱[1] SU Haiying;JIA Xiaojing;XU Yanbin;LIU Huayan;LIU Chao;DING Tiezhu(Key Laboratory of Semiconductor Photovoltaic Technology,School of Physical Science and Technology, Inner Mongolia University,Hohhot 010021,China)

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古半导体光伏技术重点实验室,呼和浩特010021

出　　处：《功能材料》2018年第9期9180-9183,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11264025).

摘　　要：采用脉冲激光沉积技术(PLD),在SrTiO_3(STO)单晶片上依次沉积钇稳定氧化锆(ZrO_2∶8%(摩尔分数)Y_2O_3,YSZ)和氧化钆掺杂的氧化铈(Ce_(0.9)Gd_(0.1)O_(2-δ),GDC)制备出5种不同调制周期数n(n=4,6,10,20,30)的(Ce_(0.9)Gd_(0.1)O_(2-δ)/ZrO_2:8%(摩尔分数)Y_2O_3)_n超晶格电解质薄膜。利用X射线衍射(XRD)、高分辨率透射电子显微镜(HR-TEM)和扫描电子显微镜(SEM),研究(GDC/YSZ)n超晶格电解质薄膜的形貌和晶体结构,发现薄膜表面颗粒生长致密、均匀,薄膜的界面处无元素扩散,外延生长状况良好,薄膜的结构优异。电化学测量研究表明,随着(GDC/YSZ)n超晶格电解质界面数的增加,其离子电导率相应增加,(GDC/YSZ)n=30超晶格电解质的离子电导率最大。Up to now,solid oxide fuel cells(SOFCs)have drawn increasing interest,due to their efficiency,and high power density.yttria-stabilized zirconia(YSZ)is a superior material as an electrolyte at temperatures ranging from 800 to 1 000℃,However,gadolinium-doped ceria(G DC)has a larger ionic conductivity than YSZ at temperatures ranging from 500 to 800℃.The superlattice(GDC/YSZ)n electrolyte thin films were fabricated on SrTiO 3(STO)single crystal substrate via pulsed laser deposition(PLD)method.By controlling the sputtering time,the thicknesses of the superlattice(GDC/YSZ)n electrolyte thin films were kept at 300 nm.Five different superlattices(GDC/YSZ)n(n=4,6,10,20,30)electrolyte thin films are fabricated,The characterization of the superlattice(GDC/YSZ)n electrolyte thin films were studied through X-ray diffraction(XRD),high-resolution transmission electron microscopy(HR-TEM)and electrical conductivity measurements.Results show the superlattice(GDC/YSZ)n electrolyte thin films appeared to be homogeneous,uniform and no element diffusion at the interfaces.Electrochemical measurements showed a sizeable increase in conductivity with increasing number of GDC/YSZ interfaces.The observed enhancement in the ionic conductivity was caused by interfacial tensile strain effects rather than to interface spacecharge regions.

关 键 词：固体氧化物燃料电池 (GDC/YSZ)n超晶格电解质 脉冲激光沉积技术 界面 电导率 

分 类 号：O484[理学—固体物理] O484.1[理学—物理]