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

S. Ramesh, G. Upender, K. C. James Raju, G. Padmaja, S. Mohan Reddy, C. V. Reddy

Department of Physics, Osmania University, Hyderabad, India.
School of Physics, University of Hyderabad, Hyderabad, India.

DOI: 10.4236/jmp.2013.46116                

Abstract

Ceria based electrolyte materials are very useful in intermediate-temperature solid oxide fuel cell (IT-SOFC). The compositions Ce_0.85Gd_{0.15 - x}Ca_xO_{2 - δ} (x = 0.0 - 0.075) were prepared through sol-gel method. Their structure was studied by X-ray diffraction. Dense ceramic Ce_0.85Gd_{0.15 - x}Ca_xO_{2 - 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 Ce_0.85Gd_{0.15 -x}Ca_xO_{2 -δ} composition showed maximum ionic conductivity with less activation energy.

Keywords

Ceramic; Sol-gel Process; Activation Energy; Electrical Conductivity; Solid Electrolyte

Conflicts of Interest

The authors declare no conflicts of interest.

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