Effect of Ca on the Properties of Gd-Doped Ceria for IT-SOFC

Abstract

Ceria based electrolyte materials are very useful in intermediate-temperature solid oxide fuel cell (IT-SOFC). The compositions Ce0.85Gd0.15 - xCaxO2 - δ (x = 0.0 - 0.075) were prepared through sol-gel method. Their structure was studied by X-ray diffraction. Dense ceramic Ce0.85Gd0.15 - xCaxO2 - δ samples were prepared by sintering the pellets at 1300°C. The lattice parameter was calculated by Rietveld refinement of XRD patterns. Four probe A.C. impedance spectroscopy was used to study the total ionic conductivity of doped and co-doped ceria ceramics in the temperature range 200°C - 700°C. The Ce0.85Gd0.15 -xCaxO2 -δ composition showed maximum ionic conductivity with less activation energy.

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S. Ramesh, G. Upender, K. Raju, G. Padmaja, S. Reddy and C. Reddy, "Effect of Ca on the Properties of Gd-Doped Ceria for IT-SOFC," Journal of Modern Physics, Vol. 4 No. 6, 2013, pp. 859-863. doi: 10.4236/jmp.2013.46116.

Conflicts of Interest

The authors declare no conflicts of interest.

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