Preparation And Performance Of Iron-based Perovskite Cathode And Its Heterocmposite Oxide Electrolyte Materials

With the rapid development of society,the problems brought about by the environment are more and more concerned by people,and it is more important to choose green and pollution-free energy.With the development of fuel cells,solid oxide fuel cells（SOFCs）have become a new generation of fuel cells.Electric energy is directly converted from chemical energy,which is its characteristic.SOFCs also has high energy efficiency conversion,all-solid state,pollution-free and modular.However,the high working temperature（700-1000℃）makes this technology face many challenges in market application.Therefore,reducing the operating temperature from a higher temperature（800-1000°C）to a lower temperature range（300-600°C）has become the main research direction at present.To achieve this goal,material selection is crucial.Due to the perovskite structure（ABO₃）cathode material,which has good electronic conductivity and high electrocatalytic activity,the Ba_0.5Sr_0.5Fe_1-xSc_xO_3-δ（BSFSc_x）cathode with perovskite structure（ABO₃）and Taking the BSFSc_0.1-SDC composite electrolyte material as the research object,the electrochemical properties of the two materials at 460-550℃were explored,and certain experimental results were obtained.Sc-doped Ba_0.5Sr_0.5Fe_1-xSc_xO_3-δ（x=0,0.05,0.1,0.12）cathode materials were prepared by solid-state method.Characterization such as performance analysis studied the physical and chemical properties of the material,such as the phase structure,microstructure,synthesis process,and its application in batteries.The results show that when the cathode material Ba_0.5Sr_0.5Fe_1-xSc_xO_3-δ（x=0,0.05,0.1,0.12）is sintered at 1100°C for 10 h,no impurity is formed,and a single-phase perovskite structure is formed.Using the foamed Ni mesh as the skeleton,coated with NCAL as the anode of the battery,coated with BSFSc_0.1 as the cathode,and SDC as the electrolyte,a single cell NCAL/SDC/BSFSc_0.1 was prepared,and the single cell output power was measured at 550°C.The maximum density is643.75 m W/cm²,and the battery resistance is 0.101Ω·cm².Good output performance was obtained by reducing the operating temperature of the battery to below 550°C.This indicates that the BSFSc_0.1 cathode can possess excellent electrochemical performance at low temperature.The cathode material(BSFSc_0.1)and the electrolyte（SDC）material were solid-phase mixed by the method of mechanical mixing to make the BSFSc_0.1-SDC composite material,which was used as the electrolyte of the battery.The effect of chemical properties.The NCAL coated with the foamed Ni mesh as the skeleton was used as the anode and cathode of the battery,and the composite BSFSc_0.1-SDC was used as the battery electrolyte,and the single cell with the structure of NCAL/BSFSc_0.1-SDC/NCAL was prepared.The experimental results show that,when the composite mass ratio of BSFSc_0.1-SDC is 7:3,it has the best electrolyte performance.At 550°C,its output power density reaches a maximum of523.44 m W/cm² and an impedance value of 0.2564Ω·cm².The composite cathode material and SDC,used in the electrolyte of the battery,can also obtain good battery performance in the low temperature region,which broadens the idea and provides experimental and theoretical basis for the exploration of low temperature fuel cell electrolytes.