Low Temperature Preparation and Characterization of LSGMC based LT-SOFC Cell by Aerosol Deposition

摘要

A low temperature (≤650o C) process for fabricating nano structured (La,Sr)(Ga,Mg,Co)O_(3-δ) (LSGMC) electrolyte / (La,Sr)(Co,Fe)O_(3-δ)-(Gd,Ce)O_(2-δ) (LSCF-GDC) cathode films, ～7 and ~25 m in thickness, respectively, was developed using an aerosol deposition (AD) process for use in the low temperature solid oxide fuel cell (LT-SOFC). NiO-GDC was used as an anode substrate for fabrication of anode-supported type cell. The deposited LSGMC electrolyte and LSCF-GDC composite cathode film maintained good adhesion with the NiO-GDC anode, even though the whole process was completed at a temperature lower than 650o C. The LSGMC electrolyte was composed of nano-sized grains smaller than 30 nm. Electrical conductivity of the LSGMC electrolyte fabricated at room- temperature was higher than 30 mS/cm at 650o C. The LSCF-GDC composite cathode showed higher than 20% porosity with the grain size smaller than 100 nm. The peak power density of the LSGMC electrolyte-based, anode-supported-type cell with the nano- structured LSCF-GDC cathode produced at room temperature by AD was 0.39 W/cm~2 at 650o C.