Research On Preparation And Doping Modification Of Proton Conductor BZYO Electrolyte

In this paper,BZYO electrolytes were prepared by different preparation processes,and the differences in phase formation temperature,microstructure,sintering activity and electrolyte performance were compared.Ni-doped BZYO electrolyte was prepared by two different synthetic routes of impregnation methods to study the effect of Ni-doped electrolyte on sintering activity and ion conductivity.Firstly,white BaZr_0.85Y_0.15O_3-??BZYO?powder was prepared by impregnation method and sol-gel method.It was found by comparison that the BZYO electrolyte prepared by the impregnation method has a lot of advantages,such as low phase temperature,regular morphology,uniform dispersion,low cost,and its process is simple.The relative density of BZYO electrolyte prepared by the impregnation method reaches 89.3%at a sintering temperature of 1550?,it has a large grain size and good in compactness.The increase of the sintering temperature improves the ionic conductivity of the electrolyte,and the maximum conductivity which reaches0.057S/cm is measured in 700?at a sintering temperature of 1550?,when the crystal activation energy is 0.446eV.The BZYO electrolyte prepared by the sol-gel method is smaller in size,but has better sintering activity,and the ohmic impedance of the electrolyte increases due to the large grain boundary impedance.The maximum conductivity which reaches 0.00443S/cm is tested in 700?,and the sintering temperature is 1550?,and the crystal activation energy at this time was 0.6129 eV.In order to improve the sintering activity and ionic conductivity of BZYO,and explore a cheap and efficient preparation route as well,Ni-doped Ni-BZYO electrolyte was prepared by two different synthetic routes of impregnation method.The Ni-BZYO electrolyte has a slight improvement in sintering activity and compactness,but the ion conductivity has not been improved.The conductivity increases firstly but then decreases as the doping amount of Ni increases.The density of electrolyte has the best performance when the doping amount of Ni is up to 0.5wt%,and the electrical conductivity reaches a maximum of 0.0202 S/cm,the crystal activation energy reaches 0.4138 eV in this situation.Comparing the performance characterization of this two synthetic routes,it was found that the direct impregnation method of one-step reaction has a better density and ionic conductivity than the two-step impregnation method.