Preparation And Characteristics Of Perovskites Anode Materials For Solid Oxide Fuel Cell

In this paper, Y doped SrTiO3-(YxSr1-xTiO3-,x=0,0.02,0.05,0.08) and Y, Nbco-doped SrTiO3-(Y0.08Sr0.92NbyTi1-yO3-,y=0,0.1,0.3,0.5,0.7) were prepared bysol-gel technique. The phase composition, microstructure, thermal expansioncoefficient and electrical conductivity of the products were investigated by XRD,SEM, TEC and conductivity measurement apparatus. The results of XRD indicatethat Y-doped SrTiO3were a single phase perovskite structure, which is cubic with aapace group Pm-3m, with doping x<0.1. However, when doping x>0.1, small tracesof secondary phases were found. Meanwhile, Y, Nb co-doped SrTiO3were a singlephase with doping y<0.5. The SEM analysis show that particle diameters of powersamples are less than100nm. Y-doped SrTiO3and Y, Nb double doped SrTiO3samples exhibit good thermal compatibility compared with SDC. Through hightemperature electrical conductivity, samples show typical ionic conductivity. Y-dopedSrTiO3had the highest conductivity,8.5×10-3S cm-1at800℃.CuO/La0.2Sr0.8Mn0.5Ti0.5O3-porous anode material, which is placed in Cu(NO3)2,were prepared by impregnating and sintering at500℃. The experiment results showthat the maximum doping amount of porous anode material were40wt%. The per unitimpregnated content of LSMT40were71mg cm-3. The XRD pattern show that thecomposite anode material had two-phase, perovskite structure and CuO. SEM imagesshow that anode surface was covered with nanoscale CuO particles. LSMT40showedtypical ionic conductivity, which was1.48×10-3S cm-1at800℃.