Microstructural Evolution And Hydrogen Storage Properties Of LaFe_1-xM_xO₃（M=Ni,Cr;x=0～1.0） With Perovskite-Type Structure

perovskite-type oxides had special crystal structure and formed anion defects andmixed valence state of the ion B and vacancy by doping, thereby the physical andchemical properties of the materials presented rich diversity, which belonged to a kindof new functional materials with good performance. In recent years, LaFeO₃withperovskite-type oxides was found to have good activation performance and a certainelectrochemical capacitance, Making it attracted much attention as a new electrodematerials. However, it had lower intrinsic conductivity, which limited itselectrochemical performances. The results showed that B site doping Ni couldsignificantly improve the electrical properties of perovskite oxides.LaFe_1-xNi_xO₃（x=0¹.0） with Perovskite-type Structure were prepared byconventional solid-state reaction. XRD、SEM and TG-DSC were used to analyze thephase composition, microstructures of the materials. The results showed LaFe_1-xNi_xO₃（x=0¹.0） was perovskite structure. with Ni content increasing, the structure of thesample changed from Orthorhombic to Rhombohedral, and Particle size graduallyincreases. four probe method measured the electrical conductivity. The results showedthat with less than60%of Ni addition, the electrical conductivity measured by fourprobe method increased as Ni content and reached maxima value （S=400s/cm）at x=0.6,Further increase in doping Ni resulted in deterioration of conducting properties.LaFe_1-xCr_xO₃（x=0¹.0） with Perovskite-type Structure were prepared byconventional solid-state reaction. LaFe1-xCrxO（3x=0¹.0）was Orthorhombic structure.With Cr content increasing, the structure of the sample had not change, The SEMresults showed that With Cr content increasing, Particle size gradually reduced.In addition, Hydrogen Storage Properties of LaFeO₃/1at.%Pt was discussed. withless than300℃, The hydrogen storage volume of LaFeO₃/1at.%Pt was small. howeverThe hydrogen storage test indicated that LaFeO₃/1at.%Pt revealed a better thehydrogen dynamics performance with temperature increasing. XRD analysis showedthat crystal structure and cell volume of LaFeO₃/1at.%Pt has little changed afterLaFeO₃/1at.%Pt absorbed hydrogen.The BaMnO₃with tetragonal strcture was prepared by sol-get method.andmodified by Pt coating. By means of XRD, TEM, EDS, and the P-C-T test methods,systematically investigated its structure, morphology, hydrogen storage properties.Theresults showed that BaMnO₃/1at.%Pt had certain hydrogen storage properties, whenthe pressure reached6MP. The hydrogen storage volume reached the maximum at200 ℃. In this temperature, the pressure changed from2MP to6MP, Hydrogen storgevolume had little changed.