Ce_(0.8)Sm_(0.15-x)Nd_(x)Bi_(0.05)O_(2-δ)电解质的制备及性能  

Preparation and properties of Ce_(0.8)Sm_(0.15-x)Nd_(x)Bi_(0.05)O_(2-δ)electrolyte

作　　者：武泽栋 周芬 郜建全 宋希文[2] 陈霞 张庆彪 WU Zedong;ZHOU Fen;GAO Jianquan;SONG Xiwen;CHEN Xia;ZHANG Qingbiao(School of Rare Earth Industry,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China;School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China)

机构地区：[1]内蒙古科技大学稀土产业学院,内蒙古包头014010 [2]内蒙古科技大学材料科学与工程学院,内蒙古包头014010

出　　处：《电源技术》2025年第2期396-402,共7页Chinese Journal of Power Sources

基　　金：内蒙古自治区高校基本科研业务费(2023YXXS002,2023XKJX005,2023YXXS004)。

摘　　要：采用共沉淀法制备了Ce_(0.8)Sm_(0.15-x)Nd_(x)Bi_(0.05)O_(2-δ)(x=0,0.05,0.10,0.15)系列电解质粉体。使用热分析仪、X射线衍射仪(XRD)、拉曼光谱仪、紫外-可见光光谱仪(UV-Vis)分别对前驱体的分解过程、粉体的结构、表面化学状态及禁带宽度进行表征;使用扫描电子显微镜(SEM)和电化学交流阻抗频谱(EIS)技术分别对试样的断面形貌及电性能进行了测试。由热重-差示扫描量热法(TG-DSC)分析可知,前驱体的热分解温度约为291.4℃,XRD结果表明共沉淀法制备的Ce_(0.8)Sm_(0.15-x)Nd_(x)Bi_(0.05)O_(2-δ)电解质粉体呈单一的立方萤石结构。由拉曼光谱分析可知,Ce_(0.8)Sm_(0.1)Nd_(0.05)Bi_(0.05)O_(1.5)的氧空位浓度最高。各试样的禁带宽度为1.86~2.59 eV。电解质经1300℃烧结5 h后,晶粒大小均匀、致密度良好。在500~700℃,电导率随测试温度的升高而增大。在700℃时,Ce_(0.8)Sm_(0.1)Nd_(0.05)Bi_(0.05)O_(1.5)的电导率最大,其值为2.84×10^(-2)S/cm,而且随着Nd3+掺杂量的增加,不同组分电解质的电导率先升高后降低。A series of Ce_(0.8)Sm_(0.15-x)Nd_(x)Bi_(0.05)O_(2-δ)(x=0,0.05,0.10,0.15)electrolytes were prepared by coprecipitation.The decomposition course of the precursor,crystal phase structure,surface chemical state and band gap energy of all the calcined powers were investigated by using thermal analyzer,Xray diffraction(XRD),Raman spectrometer and UV-visible(UV-Vis),respectively.The cross section images and electrical properties were investigated by scanning electron microscopy(SEM)and electrochemical AC impedance spectroscopy.The TG-DSC analysis indicates that the thermal decomposition temperature of the precursor is about 291.4℃.The XRD results show that the synthesized samples are cubic fluorite structure of single phase CeO_(2).According to the results of the Raman spectra analysis,the Ce_(0.8)Sm_(0.1)Nd_(0.05)Bi_(0.05)O_(1.5) has the highest oxygen vacancy concentration.The band gap energy value of all the samples is in the range of 1.86-2.59 eV.All the samples sintered at 1300℃for 5 h have uniform grain size and good densification.In the temperature range of 500-700℃,the conductivity increases with the increase of the test temperature.The Ce_(0.8)Sm_(0.1)Nd_(0.05)Bi_(0.05)O_(1.5) shows the highest conductivity with a value of 2.84×10^(-2)S/cm at 700℃.The conductivity of different component electrolyte powders increases first and then decreases with the increase of Nd^(3+) doping amount.

关 键 词：氧化铈基电解质 共沉淀法 共掺杂 电导率 

分 类 号：TM911.4[电气工程—电力电子与电力传动]