Fabrication of Thin Film Layer Between the Cathode and Electrolyte of Solid Oxide Fuel Cell By Using a Spin Coating Method

Abstract

Solid oxide fuel cell has been considered as a promising future energy generating system due to its high efficiency and zero-emission of pollutants when hydrogen gas was used as a fuel. There have been numerous efforts to increase the amount of generated power of the cell for many years. In this study, thin film layer of Lanthanum, Strontium and Barium doped ceria (La0.75Sr0.2Ba0.05)Ce0.825O2 - δ was fabricated by using a spin coating method to enhance the bonding property between the cathode and electrolyte layer, and it leads to the improvement of the cell property. The fabrication of (La0.75Sr0.2Ba0.05)Ce0.825O2 - δ layer on the gadolinium doped ceria (GDC) electrolyte layer was confirmed by energy dispersive X-ray spectroscopy (EDS) measurement. The thickness of thin film layer was 150nm~300nm and its cross section was checked by scanning electron microscopy(SEM). Power density of the cell was about 540mW/cm2 at 650℃ and its value was almost twice higher than the cell which didn’t have the (La0.75Sr0.2Ba0.05)Ce0.825O2 - δ layer. Impedance spectroscopy of the cell was measured by electrochemical measurement equipment and its ohmic resistance was lower than the cell without thin film layer, as expected. Figure 1