| 초록 |
20 mol. % samarium doped cerium oxide (Sm0.2Ce0.8O1.9, SDC) has an excellent ionic conductivity than 8 mol% yttria stabilized zirconia (Y0.08Zr0.92O1.96, YSZ) commercially available in Solid Oxide Fuel Cell (SOFC). To fabricate SDC electrolyte, however, requires high temperature sintering process with 1600℃ or higher. This study aims to lower sintering temperature and to improve the electrolyte performance. Li2CO3 was used as a sintering aids to lower sintering temperature. To investigate the effects of Li+ amounts, 0, 3, 6, 9, and 12 mol.% of Li+ added SDC samples were prepared. The Li added-SDC electrolytes were sintered at 1400°C and compared to SDC electrolyte sintered at 1600°C. The electrochemical characteristics of the samples were investigated by relative densities, XRD, SEM, and EIS analysis. L06-SDC (Li+ 6 mol.%) has a highest relative density (97.495%) of the SDC sintered at 1600℃ and the grain boundary is very obvious comparing to the other samples. Due to the obvious grain boundary formation exhibited in L06-SDC, the ionic conductivity improved and internal resistance decreased showing 0.1836 Ω at 850℃ in H2. |
