Investigation of Divalent/Trivalent Metal Doping into SrFeO3 as a Cathode Material for Low Temperature SOFC

Abstract

In this research, I have prepared cathode for low temperatures solid oxide fuel cells. Divalent (Ba, Mg) and Trivalent (Co, Al) were mixed in strontium ferrite oxide materials. Mixture of these samples were dried at 200℃ for 150 minutes in oven for its dehydration. Then, samples were passed through sintering process at 750℃ for 4 hours. Due to sintering at high temperature, our samples become dense, its many properties were changed at large temperature like, increase its mechanical strength of Nano materials, and boost up its bond strength and also material become homogeneous and stable. Fabricated material were characterized by UV- Visible spectroscopy, FTIR (Fourier transform infrared), and Raman Analysis. FTIR technique was set peaks at transmission of light with wavelength 400cm-1 and 4000 cm-1. FTIR peak at 1017 cm-1 indicate Fe–Ba–O bonds, carbonate groups and hydroxyl groups present at peak1453 cm-1 and 1642 cm-1 respectively, while 2834 to 2980 cm-1 peaks were denoted the CH2 and CH3 acetate formation. UV-visible is analytical technique which was proceed the data about sample composition, structural properties of the nano particles when light was transmitted in the materials at diverse wavelength. By Tuac plot of UV-visible we have calculated the band energy gap value Ba metal in SrFeO3 materials was measured 2.80eV, Eg of Al was 2.66 Ev. These energy values are required to excite the electrons form VB to CB to make the material conductive. Raman spectra illustrate the orthorhombic and FeO₆ octahedral structure at peaks ranges 123 to 664 cm⁻¹, tells about vibrational modes and presence of of oxygen vacancies, this show that more oxidation reduction reaction phenomena occur.