ELECTROCHEMICAL EVALUATION OF MICRO-TUBULAR SOFC AND MODULE FOR ADVANCED CERAMIC REACTOR

摘要

An anode supported micro-tubular cell has high power generation performance and high thermal shock resistance, so it would be possible to achieve a high power density even at low temperatures and to shorten the time for starting up and shutting down. In this study, the performance of the micro-tubular single cell and the cube module which is the single cell bunched module were evaluated and their problems were discussed. First of all, the micro-tubular single cell was tested. The micro-tubular cell consists of Ni-GDC (Gd Doped Ceria) cermet anode, GDC electrolyte and LSCF ((La, Sr)(Co, Fe)O{sub}3) cathode. Although the open circuit voltage decreases with increasing temperature, the output power increased with increasing temperature. When the current applied, the cell temperature change along with the decrease of the electronic conduction and the increase of the oxide ionic conduction were observed. Secondly, a cube module which consists of six micro-tubular cells and cathode matrices was also tested. The output power of the cell was lower than the single cell. When the cathode current corrector was two terminals, the output power was higher than that of single current correction. At 550℃, the output power was the highest and it decreased at higher temperatures. It is because the too high temperature causes the electronic conduction thorough the electrolyte. At 600℃, the output power increased with the increasing the flow rate of the cathode gas because the temperature decreased.