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 |
Full Text PDF |
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 |