摘要
采用柠檬酸-硝酸盐自蔓延燃烧法合成了LaFe1-xCuxO3-δ(LFC)阴极粉体和Gd0.1Ce0.9O2-δ(GDC)电解质粉体,构建了对称固体氧化物燃料电池LFC/GDC/LFC。利用X射线衍射法(XRD)研究LFC材料的物相结构以及与电解质GDC的化学相容性,采用直流四端子法测试了阴极的电导率,采用交流阻抗法记录界面极化行为,通过扫描电子显微镜(SEM)观察对称电池的断面微观结构。结果表明:合成的LFC粉体(x≤0.2)均呈现单一的钙钛矿结构,且与电解质GDC在低于900℃具有良好的化学相容性;B位掺杂Cu元素能够提高阴极材料的电导率,700℃左右在x=0.2时其电导率最大为104 S·cm^-1;极化阻抗随着Cu^2+掺杂量的增加而减小,x=0.2时在750℃空气气氛下的电极与电解质间的极化阻抗Rp最小为0.237Ω·cm^2。
Cathode powders of LaFe1-xCuxO3-δ(LFC)and electrolyte powders of Gd0.1Ce0.9O2-δ(GDC)were synthesized by acitric acid-nitratesself-propagating combustion method.The symmetrical solid oxide fuel cell based on the configuration of LFC/GDC/LFC was fabricated.The phase structure of LFC materials and the chemical compatibility with GDCelectrolyte,electrical conductivity,polarization resistance and the cross-section microstructure of symmetrical cell were investigated by X-ray diffraction(XRD),direct current four-terminal method,electrochemical impedance spectra and scanning electron microscope(SEM),respectively.The XRD results indicate that the synthesized LFC powders(x≤0.2)exhibited a single perovskite structure and has good chemical compatibility with GDCelectrolyte below 900℃.The electrical conductivity of cathode materials can be improved by doping Cu element at B site,where is up to 104 S·cm^-1 at x=0.2 about 700℃.The polarization resistance decreased with the increase of the doping amount of Cu^2+,for x=0.2,the minimum polarization impedance Rpbetween the electrode and the electrolyte in air at 750℃was 0.237Ω·cm^2.
作者
冯晓霞
谢志翔
王竹梅
张天峰
李月明
FENG Xiaoxia;XIE Zhixiang;WANG Zhumei;ZHANG Tianfeng;LI Yueming(School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,China;China National Light Industry Key Laboratory of Functional Ceramic Materials,Jingdezhen 333403,China;Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province,Jingdezhen 333403,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2020年第3期27-32,共6页
China Ceramics
基金
国家自然科学基金(51402136)
江西省自然科学基金(20171BAB216008)
江西省教育厅(GJJ180707)
景德镇陶瓷大学研究生创新基金(JYC201810)资助。
