| 초록 |
The conversion of CO2 and steam into syngas in a pressurized solid-oxide coelectrolysis cell (SOC) is considered one of the most promising pathways towards the production of sustainable fuels. In this study, we report the design and development of a high-pressure tubular SOC system that can efficiently convert the mixture of steam and CO2 into valuable syngas fuel. Then, the pressurized SOC was operated between 1-8 bar pressure at 800 °C in both fuel cell and coelectrolysis modes. In the fuel cell mode, the SOC showed an increase of 44.2% in the maximum power density when the pressure was increased from 1 to 8 bar. It was found that, in the pressurized-tubular SOC, the open circuit voltage (OCV) and the reaction kinetics (electrode performance) is increased by increasing the pressure from 1-8 bar. The impedance spectroscopy analysis indicated that by increasing the operation pressure, the polarization resistance related to the diffusion of the gasses in the fuel electrode was reduced up to 50% at 8 bar pressure, thus resulting into a significant improvement in the performance of the tubular SOC at elevated pressure. |
