Design And Study Of Iron-based Perovskite Cathodes For Proton-conducting Solid Oxide Fuel Cells

A solid oxide fuel cell(SOFCs)is the most efficient device for generating electrical energy from fuel.limitation of its application is due to the high operating temperature of traditional SOFC materials.progress has been made in the use of alternative oxygen ion conducting electrolytes to reduce the operating temperature,but stability and electronic conductivity problems remain.The power problem of the battery at a certain temperature is also the main consideration,in which the choice of solid oxide fuel cell in electrolyte material is mainly the battery of oxygen ion conductor represented by SDC?YSZ and BCZY,and the choice of cathode material is extensive.Based on the LSF of perovskite materials,the sintering activity and electrochemical properties of perovskite materials are improved.The main tasks are as follows:(1)New material La_0.5Sr_0.5FeO_3-?(LSF),La_0.25Pr_0.25Sr_0.5FeO_3-?(LPSF),Pr_0.5Sr_0.5FeO_3-?(PSF)were prepared by doping on the site(LPSF).When the electrolyte is BCZY,the electrochemical properties and sintering activity of the three materials at the same temperature are studied to judge the effect of Pr doping on the raw materials,And the effect of Pr doping content on raw materials,The experimental results show that the doping of Pr can promote the LSF and the battery power reaches the highest Pr doping50%,LPSF power reaches 616 m W cm^-2at 700?.(2)With Pr elements of 0%,30%,50%,50%,70%,100%content,La_0.5Sr_0.5FeO_3-?,La0.35Pr0.15Sr0.5FeO3-?,La0.25Pr0.25Sr0.5FeO3-?,La0.15Pr0.35Sr0.5FeO3-?,Pr0.5Sr0.5FeO3-?When the electrolyte is a SDC(oxygen ion conductor),it determines the influence of the doping of different Pr elements on the LSF performance of the raw material by testing the electrochemical properties of the five cathodes,Experimental results show that the highest electrochemical performance is 990 m W cm^-2 when the doping content is La0.25 Pr 0.25 Sr0.5FeO3-??(3)Three-layer fuel cells were prepared by adding a functional layer on the basis of electrolyte BCZY La_0.5Sr_0.5Fe_0.9Mo_0.1O_3-?(LSFMo)by doping 10%on the Fe to make a new material.Compared with its electrochemical performance,the experimental results show that the doping of Mo can promote the battery performance,and the battery power reaches 1174 m W cm^-2 at 700?.