Journal of Fundamentals of Renewable Energy and Applications
Open Access

Theoretical and experimental study of CaxCe1-xO2- electrolyte for SOFCs

3^rd International Conference on Battery and Fuel Cell Technology

September 10-11, 2018 | London, UK

Amjad Ali  and Rizwan Raza

COMSATS Institute of Information Technology, Pakistan
University of Okara, Pakistan
Royal Institute of Technology, Sweden

Posters & Accepted Abstracts: J Fundam Renewable Energy Appl

Abstract :

Calcium doped ceria (CaxCe1-xO2-δ,x = 0.03, 0.12, 0.19) electrolyte was synthesized using co-precipitation method for low temperature solid oxide fuel cell. The composition CDC3 (Ca0.19Ce0.81O1.90) shows the highest ionic conductivity of 0.095 Scm-1and lowest activation energy of 0.49eV. First-principle calculations based on density functional theory are performed to investigate the doping effects of Ca in ceria Ce0.81Ca0.19O1.90 (CDC3). The influence of first, second and third oxygen vacancy in Ca-doped ceria is investigated theoretically. It is observed that oxygen vacancies tend to increase the lattice parameter and decrease the bulk modulus. Dopant-vacancy association energies and vacancy formation energies are calculated to reveal the doping effects on oxygen ion conduction. The effect of first, second and third oxygen vacancy on the density of states and band gap was discussed. This analysis gives a useful idea of vacancy diffusion that could be beneficial in optimizing doping materials for enhancing oxygen ion conductivity in doped ceria.

Biography :

E-mail: amjad09pu@yahoo.com