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Vol. 30 No. 6 (2018): Vol 30 Issue 6

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Electrical Properties of Sr2+ and Gd3+ Codoped Ceria Electrolyte System for LT-SOFC

https://doi.org/10.14233/ajchem.2018.21147
P. Koteswararao
Department of Physics, Geethanjali College of Engineering and Technology, Cheeryal (V), Keesara (M), Medchal District-501 301, India
M. Buchi Suresh
Center for Ceramic Processing, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad-500 005, India
P. Varalaxmi
Department of Physics, Anurag Engineering College, Aushapur (V), Ghatkesar (M), Rangareddi District-501 301, India
B.N. Wani
Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India
P.V. Bhaskara Rao
Department of Physics, Wollega University, Nekemte, Ethiopia

Corresponding Author(s) : P. Koteswararao

koteswarphysics@gmail.com

Asian Journal of Chemistry, Vol. 30 No. 6 (2018): Vol 30 Issue 6

Abstract

This paper reports the effect of Sr2+ addition on electrical properties of Ce0.8Gd0.2O2-δ (GDC) electrolyte for low temperature solid oxide fuel cell application. The Sr2+ (0, 0.5, 1 and 2 mol %) doped GDC solid electrolytes have been prepared by solid state method. The sintered densities of the samples are around 95 %. Among all the compositions, the highest ionic conductivity is observed in the GDC sample with 0.5 mol % Sr addition. Nyquist plots resulted in multiple redoxation process such as grain and grain boundary conductions to the final conductivity. Estimated blocking factor is lower for the GDC electrolyte with 0.5 mol % Sr2+, indicating that Sr2+ addition promoted grain boundary conduction. Activation energies were calculated from Arrhenius plot and are found in the range of 0.80 to 1.25 eV, indicating oxygen ion conduction in the doped GDC electrolyte system of samples.

Keywords

Conductivity GDC electrolyte Impedance Ionic conductivity Activation energy
Koteswararao, P., Suresh, M. B., Varalaxmi, P., Wani, B., & Bhaskara Rao, P. (2018). Electrical Properties of Sr2+ and Gd3+ Codoped Ceria Electrolyte System for LT-SOFC. Asian Journal of Chemistry, 30(6), 1217–1220. https://doi.org/10.14233/ajchem.2018.21147
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