固体电解质Ce_(0.8)Sm_(0.16)Pr_(x)Gd_(0.04-x)O_(1.9)制备与性能研究  

Preparation and Properties of Solid Electrolyte Ce_(0.8)Sm_(0.16)Pr_(x)Gd_(0.04-x)O_(1.9)

作　　者：阳杰[1] 王亚君 田长安 秦广超[1] 程继海[1] 李东 司小强 Yang Jie;Wang Yajun;Tian Chang'an;Qin Guangchao;Cheng Jihai;Li Dong;Si Xiaoqiang(School of Energy Materials and Chemical Engineering,Hefei University,Hefei 230601,China;School of Chemistry and Civil Engineering,Shaoguan University,Shaoguan 512005,China)

机构地区：[1]合肥学院能源材料与化工学院,安徽合肥230601 [2]韶关学院化学与土木工程学院,广东韶关512005

出　　处：《中国稀土学报》2023年第5期904-911,I0002,共9页Journal of the Chinese Society of Rare Earths

基　　金：安徽省高校省级优秀青年人才基金项目(gxyq2022072);合肥学院省级质量工程示范化学实验实训中心项目(2022sysx024);合肥学院本科质量工程项目:化学实验教学团队(2022hfujxtd04);国家自然科学基金项目(61804039);安徽省自然科学基金项目(2108085ME152);广东省普通高校特色创新项目(2021KTSCX122);广东省基础与应用基础研究基金项目(2021A1515010671)资助。

摘　　要：以硝酸钐、硝酸镨、硝酸铈、硝酸钆为原料,采用溶胶-凝胶法合成固体氧化物燃料电池(SOFCs)固体电解质Ce_(0.8)Sm_(0.16)Gd_(0.04-x)Pr_(x)O_(1.9)(x=0,0.01,0.02,0.025,0.03,0.035,0.04),并通过扫描X射线衍射(XRD)、电子显微镜(SEM)、热重-差示扫描量热分析(TG-DTG)、以及电化学阻抗谱(EIS)等表征技术对样品进行了测试分析。实验结果表明,在1300℃下烧结3 h即得到相对密度均大于95%及烧结活性高、分散性良好、平均粒径约为53.16 nm的立方相Ce_(0.8)Sm_(0.16)Gd_(0.04-x)Pr_(x)O_(1.9)(CSPG)氧化物。电化学性能研究表明,适量Pr掺杂可以显著提高Ce_(0.8)Sm_(0.16)Gd_(0.04)O_(1.9)(SGDC)电解质的离子电导性能。其中,Ce_(0.8)Sm_(0.16)Pr_(0.03)Gd_(0.01)O_(1.9)电导率最大,与SGDC电解质相比,电导率提高了10倍,在800℃时达到0.0494 S·cm^(-1),活化能仅为0.0354 e V,组装的单电池获得峰值功率密度为0.54 W·cm^(-2)。Solid oxide electrolyte Ce_(0.8)Sm_(0.16)Pr_(x)Gd_(0.04-x)O_(1.9)(x=0,0.01,0.02,0.025,0.03,0.035,0.04)of solid oxide fuel cell(SOFCs)was prepared by sol-gel method using samarium nitrate,praseodymium nitrate,cerium nitrate and gadolinium nitrate as raw materials.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),thermogravimetric differential scanning calorimetry(TG-DTG),and elec⁃trochemical impedance spectroscopy(EIS).The experimental results show that the cubic phase Ce_(0.8)Sm_(0.16)Pr_(x)Gd_(0.04-x)O_(1.9)(CSPG)with relative density greater than 95%,high sintering activity,good dispersion and average particle size of 53.16 nm can be obtained by being sintered at 1300℃for 3 h.The results of elec⁃trochemical properties show that appropriate Pr doping can significantly improve the ionic conductivity of Ce_(0.8)Sm_(0.16)Gd_(0.04)O_(1.9)(SGDC).Compared with SGDC electrolyte,the conductivity of Ce_(0.8)Sm_(0.16)Pr_(0.03)Gd_(0.01)O_(1.9) is in⁃creased by 10 times,reaching 0.0494 S·cm^(-1) at 800℃,the activation energy is 0.0354 eV,and the peak pow⁃er density of the assembled single cell is 0.54 W·cm^(-2).

关 键 词：固体电解质 溶胶-凝胶法 电化学性能 燃料电池 稀土 

分 类 号：TQ174[化学工程—陶瓷工业] O646[化学工程—硅酸盐工业] TM911[理学—物理化学]