TITLE:
Effect of Ca on the Properties of Gd-Doped Ceria for IT-SOFC
AUTHORS:
S. Ramesh, G. Upender, K. C. James Raju, G. Padmaja, S. Mohan Reddy, C. V. Reddy
KEYWORDS:
Ceramic; Sol-gel Process; Activation Energy; Electrical Conductivity; Solid Electrolyte
JOURNAL NAME:
Journal of Modern Physics,
Vol.4 No.6,
June
21,
2013
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.