Fabrication of Nanoparticle Networked La0.6Sr0.4Co0.2Fe0.8O3-δ Thin Film Layer between the Cathode and Electrolyte of Solid Oxide Fuel Cell by Using a Spin Coating Method

Abstract

In this study, nanoparticle network of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) thin film layer was coated via spin-coating using metal-nitrate solution to enhance the connectivity between cathode layer and electrolyte. The layer was annealed at 500oC after coated and then LSCF- gadolinium doped ceria (GDC) cathode layer was screen printed. The layer showed amorphous phase after 500oC annealing, and it changed to crystallized phase after sintering at 1050oC. The fabrication of LSCF layer on the GDC electrolyte was confirmed by energy dispersive X-ray spectroscopy (EDS) measurement. The crystallite size and thickness of the LSCF layer were measured by Scanning electron microscopy (SEM). The results were 20 to 50nm and 200 to 300nm, respectively. The I-V performance of the cell was improved as a function of the coating times. Electrochemical impedance spectroscopy (EIS) data of the cells showed that ohmic resistance and cathode polarization were lower than the cell without thin film layer.