Investigation of Structural and Electrical Properties of (Bi2O3)1-x-y(CeO2)x(Eu2O3)y Electrolytes for Solid Oxide Fuel Cells

Y. Isleka, M. Kasikci Ozena, R. Kayalia, M. Arib aDepartment of Physics, Faculty of Science and Letters, Nigde Omer Halisdemir University, Nigde, Turkey bDepartment of Physics, Faculty of Science, Erciyes University, Kayseri, Turkey

Received: November 27, 2017; in final form March 5, 2019

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In the present study, CeO2 and Eu2O3 doped Bi2O3 composite materials for solid oxide fuel cells were investigated. (Bi2O3)1-x-y(CeO2)x(Eu2O3)y ternary systems (x=0.01, 0.03, 0.05, 0.07, 0.09, 0.11 and y=0.11, 0.09, 0.07, 0.05, 0.03, 0.01 dopant concentrations) were fabricated at different temperatures (650, 700, 750, and 800°) using conventional solid-state synthesis techniques. Characterization of these electrolyte samples were carried out by X-ray powder diffraction, differential thermal analysis/thermal gravimeter, and the four-point probe technique measurements. X-ray powder diffraction measurements showed that nearly all the samples have α+β+γ phase except the samples with tetragonal β-phase sintered at 700, 750° and 750, 800° with the dopant ratios (x=0.07, y=0.05) and (x=0.09, y=0.03), respectively. Four-point probe technique measurements showed that the measured ionic conductivity of the stable samples vary in the range 1.05×10-1-4.76×10-1 S/cm. Additionally, the activation energy values of the samples were calculated with the help of the Arrhenius equation adapted to the logσ graphics versus 1000/T varying in the range 0.7799-0.8746 eV. This result shows that there is a good relationship between the activation energy values and conductivity values.

DOI:10.12693/APhysPolA.135.347 topics: solid state ceramic technique, activation energy, electrical conductivity, electrolyte, Arrhenius