Abstract
We have successfully fabricated (PrBa)Co2O5+δ and (LaBa)Co2O5+δ epitaxial thin film on various single crystal substrates. Physical and electrochemical properties characterizations were carried out. Highly conductive oxygen-deficient double perovskite LnBaCo2O5+ thin films were grown on single crystal (001) SrTiO3 (STO), (001) MgO, (001) LaAlO3 and (110) NdGaO3} substrate by pulsed laser deposition. Microstructure studies from synchrotron X-ray diffraction and Transmission electron microscopy. High temperature transport properties was carried in different atmosphere (O2,Air, N2) up to ~900K. Resistance response of (LaBa)Co2O5+δ epitaxial thin film was characterized in oxygen, nitrogen and 4% hydrogen over a wide range of temperature from 400 C up to 800 C. To determine the electrode performance and oxygen exchange kinetics of PrBaCo2O5+δ, multi-layered thin film based half cell was deposited on LaAlO3(001) substrate. The temperature dependence of the resistance of this half cell structure was characterized by electrochemical impedance spectroscopy (EIS) within different temperature and gas environments. Anode supported fuel cells, with GCO:YSZ multilayer thin film as electrolyte and PBCO thin film as electrode, are fabricated on tape casted NiO/YSZ substrate. Full cell performance is characterized up to 800 C.
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