摘要
采用溶胶-凝胶法合成中低温固体氧化物燃料电池(IT-SOFC)阴极材料La_(1.5)Ba_(0.1)Sr_(0.4)CoMO_(5+δ)(M为Co、Cu、Fe、Ni)(LBSCM),通过X射线衍射(XRD)、热膨胀系数(TEC)测试、扫描电镜(FESEM)、直流四电极法对材料的微观结构及电性能进行研究。XRD分析结果表明,溶胶-凝胶法制备的LBSCM均为双钙钛矿结构,阴极粉体颗粒大小较均匀、致密度较高。利用直流四电极法测试了阴极材料LBSCM的电导率,结果表明,在测试温度400~800℃下,LBSCM(M=Fe)导电机制符合小极化子导电理论,而LBSCM(M为Co、Cu、CuFe)电导率随着测试温度的升高逐渐减小,表现为类金属导电机理,其中电导率最大的是LBSCM(M=Co),在400℃达到了1 204 S/cm。热膨胀系数研究结果表明,掺杂Cu、Fe、Ni的LBSCM阴极材料热膨胀系数均明显降低。
La1.5Ba0.1Sr0.4CoMO5+δ( LBSCM,M = Co,Cu,Fe and Ni) cathode materials for medium and low temperature solid oxide fuel cell( IT-SOFC) are synthesized via sol-gel method. The microstructure and electrical properties of the materials are studied by means of X-ray diffraction( XRD),thermal expansion coefficient( TEC),scanning electron microscope( FESEM) and DC four-electrode method.XRD results show that LBSCM prepared via solgel method possesses double perovskite structure,and the cathode powder made from LBSCM has uniform particle size and high density.The results by DC four-electrode method show that the conductivity mechanism of LBSCM( M = Fe) in the test temperature range of 400-800℃ accords with the theory of small polaron conductivity,while the conductivity of LBSCM( M = Co,Cu or Cu Fe) decreases with the increase of test temperature,showing a metal-like conduction mechanism.Among which LBSCM( M = Co) shows the largest conductivity,reaching 1,204 S·cm-1 at 400℃ .The results by TEC study indicates that thermal expansion coefficients of LBSCM cathode materials doped with Cu,Fe and Ni decreases obviously.
作者
程旭
李松波
安胜利
杜旭
CHENG Xu;LI Song-bo;AN Sheng-li;DU Xu(School of Chemistry and Chemical Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China;School of Material and Metallurgy,Inner Mongolia University of Science&Technology,Baotou 014010,China)
出处
《现代化工》
CAS
CSCD
北大核心
2021年第9期92-95,共4页
Modern Chemical Industry
基金
国家自然科学基金项目(51474133)
内蒙古自然科学基金项目(2017MS0218)。
关键词
溶胶-凝胶法
阴极材料
钙钛矿
热膨胀
电导率
sol-gel method
cathode material
perovskite
thermal expansion
conductivity
