Browsing by Author "Bushra Mumtaz"

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    Alkaline Metal Coated Nanostructured Doped Ceria Electrolyte For Low Temperature SOFCs
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Bushra Mumtaz; CIIT/FA22-RPH-017/LHR; Dr. Ghazanfar Abbas; LHR TP 9431
    In this study, electrolyte was fabricated for solid oxide fuel cells. Alkaline (Ba, Ca, Sr) coated samarium doped ceria and gadolinium doped ceria electrolyte for solid oxide fuel cell was prepared successfully. All of these samples were prepared by co- precipitation method. These materials give better results and produce more oxygen ions vacancies which enhance the oxidation reduction reaction. The synthesized material characterized by using Raman Spectroscopy, Uv-Vis spectroscopy, X-ray diffraction and Electrochemical Impedance Spectroscopy. Raman spectra show vibration modes and the structure of materials particles. Raman analysis of samples was done from 700- 900 °C. These results showed the strong peak of cerium oxide in range of 450 to 470nm and the weak intense peak representing oxygen ion vacancies. It tells about which type of shifting occurring in prepared material. In all prepared materials, there is blue shifting and wavelength is decreasing which show that particles size is decreasing. In UV-Vis spectroscopy result demonstrated the band gap values which ranges from 1eV to 2.5eV. With the help of XRD compositions and structure was confirmed, which is found to be cubic. EIS tells about the ionic and electronic behavior of materials. EIS tells about ohmic resistance, polarization resistance and total resistance of the material. EIS tells about charge transfer and mass transfer in material. The conductivity of materials can be calculated with the help of EIS, which is found to be 0.005Scm-1 at 550°C.