Preparation And Characterization Of Perovskite-like Cathode Materials

With the continuous development of human society,energy and environmental protection have become two significant issues that cannot be ignored in nowadays society.Solid oxide fuel cell technology has attracted widespread attention due to its high efficiency and cleanliness.However,the cost of construction,operation and maintenance of solid oxide fuel cells operating under traditional high temperature conditions is really high,which limits its commercial development.Therefore,the research of reducing operation temperature has become the development focus of this field.In this paper,the cathode materials of La1.5Pr0.5Ni0.95-xCuxAl0.05O4+δ(x=0-0.95)、La1.5Pr0.5Ni0.95-xCuxO4+δ(x=0-0.5)、Sr3Fe2-XNixO7-δ(x=0-0.3)were prepared in order to meet the selection criteria of cathode and possess excellent electrocatalytic performance.La1.5Pr0.5Ni0.95-xCuxAl0.05O4+δ(x=0-0.95)cathode materials were prepared by sol-gel method.The XRD pattern results showed that all samples formed a stable single pure phase.Doping a small amount of Al,the thermal expansion coefficient of the sample decreases,the electrical conductivity decreases greatly,and the polarization resistance decreases slightly.With the increase of the doping content of Cu element,the thermal expansion coefficient of the sample decreases continuously,the conductivity increases firstly and then decreases,and the polarization resistance decrease followed by an increase.In this series of samples,Lai.5Pr0.5Ni0.85Cu0.1Al0.05O4+δ possess the highest output power density of 531.6 mW·cm-2 at 800℃.La1.5Pr0.5Ni0.9-xCuxO4+δ(x=0-0.5)cathode material was prepared by sol-gel method.With the increase of the doping content of Cu,the thermal expansion coefficient of the sample decreases continuously,the conductivity increases firstly and then decreases,and the polarization resistance decrease followed by an increase.The output power density of Lai.5Pr0.5Ni0.9Cuo.iO4+δ reached 566.8 mW.cm-2 at 800℃.In addition,a high-order perovskite-like Sr3Fe2-xNixO7-δ(x=0.1-0.3)cathode materials were prepared by the same method.With the increasing doping content of Ni element,the thermal expansion coefficient of the sample decreases continuously,the electrical conductivity increases continuously,and the polarization resistance decrease followed by an increase.In this series of samples,Sr3Fei.9Ni0.1O7-δ possess the highest output power density of 421.6 mW cm-2 at 800℃.