• LEMESSA ASEFA ERESSA

      Articles written in Bulletin of Materials Science

    • Electrical properties of praseodymium and samarium co-doped ceria electrolyte for low-temperature solid oxide fuel cell application

      LEMESSA ASEFA ERESSA P V BHASKARA RAO

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      In this study, we aimed to investigate the structural, morphology and electrical properties of praseodymium and samarium co-doped ceria electrolytes, synthesized using the sol–gel method, for use as an electrolyte in lowtemperature solid oxide fuel cell (LT-SOFC) applications. The X-ray diffraction result shows that all of the samples crystallized into a single-phase cubic fluorite form. The average relative densities of samples sintered at 1400°C is 97.9% of theoretical densities, indicating that they can be used as an electrolyte in LT-SOFC applications. A fascinating and maximum value of ionic conductivity 1.94${\times}$10$^2$ S cm$^{–1}$ and least activation energy ($E_a$ = 0.55 eV) were found for the composition Ce$_{0.8}$Sm$_{0.1}$Pr$_{0.1}$O$_{1.9}$ at a temperature of 500°C. The ionic conductivity and activation energies of compositions Ce$_{0.85}$Sm$_{0.1}$Pr$_{0.05}$O$_{1.925}$ and Ce$_{0.9}$Sm$_{0.05}$Pr$_{0.05}$O$_{1.95}$ found at 500°C were (1.41${\times}$10$^2$ S cm$^{–1}$, $E_a$ = 0.59 eV) and (5.95${\times}$10$^3$ S cm$^{–1}$, $E_a$ = 0.64 eV), respectively. Moreover, all the Praseodymium and samarium co-doped ceria (PrSDC) samples conduct at lower temperature of 300°C. All these results confirmed that praseodymium and samarium co-doped ceria can be useful as a solid electrolyte in LT-SOFC applications.

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