摘要
为了提高固体氧化物燃料电池(Solid Oxide Fuel Cells,SOFCs)尖晶石氧化物CuFe_(2)O_(4)阴极材料的性能,通过元素掺杂策略对其进行了改性研究。采用溶胶—凝胶法制备了不同Ni掺杂量的CuFe_(2−x)Ni_(x)O_(4)材料(x=0,0.01,0.03,0.05,0.10),研究了该材料系列的物相、与电解质的高温化学相容性、电导率、热膨胀系数以及半电池上阴极的电化学性能。研究结果表明,CuFe_(1.95)Ni_(0.05)O_(4)具有最大的电导率和最小的极化阻抗,在800℃下分别可达5.21 S·cm^(−1)和2.89Ω·cm^(2)。适量的Ni掺杂提高了CuFe_(2)O_(4)的电导率和氧空位浓度,从而改善了材料的氧还原反应活性,并使其氧还原反应的速率控制步骤从电荷转移过程向氧的吸附解离过程转变。
A Ni doping strategy was used to improve the performance of spinel oxide CuFe_(2)O_(4) cathode material for solid oxide fuel cells(SOFCs).CuFe_(2−x)Ni_(x)O_(4)(x=0,0.01,0.03,0.05,0.10)powders were prepared by using a sol-gel method.Phase composition,high temperature chemical compatibility with electrolyte,electrical conductivity,thermal expansion coefficient and electrochemical properties of the cathodes in half cell were thematically studied.CuFe_(1.95)Ni_(0.05)O_(4) exhibited the maximum electrical conductivity and the minimum polarization impedance,with values to be 5.21 S·cm^(−1) and 2.89Ω·cm^(2) at 800℃,respectively.Both the electrical conductivity and oxygen vacancy concentration could be optimized by controlling the doping concentration of Ni.In this case,the oxygen reduction activity of the material was boosted and the rate determining step in the oxygen reduction process was varied from charge transfer process to oxygen adsorption and dissociation process.
作者
刘楚林
马奔
周盈科
吴开明
LIU Chulin;MA Ben;ZHOU Yingke;WU Kaiming(Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)
出处
《陶瓷学报》
CAS
北大核心
2022年第5期870-878,共9页
Journal of Ceramics
基金
国家自然科学基金青年项目(51902230)
联合基金项目(U20A20279)。
