| 초록 |
Solid oxide fuel cell (SOFC) is one of the essential parts of utilizing hydrogen energy fulfilling energy cycles without CO2 generation. Particularly, thin-film SOFC (TF-SOFC) grown by pulsed laser deposition (PLD) showed the highest power efficiency, state of the art, at low operating temperature ~500 °C. Despite its superior performance, one drawback that impedes the commercialization of TF-SOFC is high growth temperature ~700 °C, resulting in durability problems in operating the equipment. To resolve this issue, we investigated a pathway to reproduce the original performances of TF-SOFC while growing it at low temperatures (<400 °C). As TF-SOFC consists of multilayers Yttria Stabilized Zirconia (YSZ) and Gadolinium doped Ceria (GDC), low-temperature deposited films were investigated by modulating growth conditions with post-annealing process. We found that YSZ and GDC thin film layers can be grown in similar morphology with that grown at 700°C. Also, the ionic conductivity of low-temperature grown YSZ and GDC, examined by electrochemical impedance spectroscopy (EIS) analyses, shows comparable value to those grown at 700°C. |
