纤维结构阴极La_(0.5)Sr_(0.5)CoO_(3−δ)的制备与性能  

Preparation and performance of fiber-structured cathode of La_(0.5)Sr_(0.5)CoO_(3−δ)

作　　者：李付绍 徐应仙 武青青 邓明森 LI Fu-shao;XU Ying-xian;WU Qing-qing;DENG Ming-sen(Guizhou Provincial Key Laboratory of Computational Nano-Material Science,Guizhou Education University,Guiyang 550018,China)

机构地区：[1]贵州师范学院贵州省纳米材料模拟与计算重点实验室,贵阳550018

出　　处：《中国有色金属学报》2022年第4期1053-1062,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52062006);贵州省基础研究计划资助项目(ZK[2021]-237)。

摘　　要：本文采用溶液静电纺丝的方法,制备了一种纤维结构阴极材料La_(0.5)Sr_(0.5)CoO_(3−δ),系统研究了该阴极材料的结构、热稳定性和电化学性能。结果表明:相对于常规粉末材料制备的普通颗粒结构阴极,纤维结构阴极的晶格热稳定性良好,孔隙分布更加均匀合理,电化学性能更加优越。在800℃下,纤维结构阴极的界面电阻低至0.035Ω∙cm^(2),对应单电池的最大输出功率为930 mW/cm^(2),表现出快速的氧还原反应电极过程动力学;常规多孔结构阴极的界面电阻为0.065Ω∙cm^(2),对应单电池的最大输出功率仅为750 mW/cm^(2);在电池的运行过程中,纤维结构阴极的电化学性能也较稳定,在750℃和0.6 V恒电位载荷下运行15 h后,电池的输出功率从740 mW/cm^(2)缓慢衰减到660 mW/cm^(2),表明极化电阻的加剧程度较小。A fiber-structured La_(0.5)Sr_(0.5)CoO_(3−δ)cathode was prepared via electrostatic spinning of solution,and the structure,thermal stability,and electrochemical performance of this fiber-structured cathode was systematically investigated.The results show that,compared with the common particle-structured cathode prepared from the plain powder material,this fiber-structured cathode reveals more favorable thermal stability of lattice,more rational pore distribution,and more advanced electrochemical performance.At 800℃,the area specific resistance with this fiber-structured cathode is as low as 0.035Ω⋅cm^(2),and the maximum power density with the corresponding single-cell is 930 mW/cm^(2),showing the fast electrode kinetics of oxygen reduction reaction.Comparatively,the area specific resistance with the common particle-structured cathode is 0.065Ω∙cm^(2),and the maximum power density with the corresponding single-cell is only 750 mW/cm^(2).Moreover,in cell operation,the electrochemical performance of this fiber-structured cathode is also very stable,and the output power of cells under a constant loading voltage of 0.6 V at 750℃drops slowly from 740 mW/cm^(2)to 660 mW/cm^(2)after 15 h of running,showing the slow worsening of area specific resistance.

关 键 词：固体氧化物燃料电池 阴极 电化学性能 纤维结构 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ152[化学工程—电化学工业]