| 초록 |
Solid Oxide Fuel Cells (SOFCs) using the ceramic as the electrolyte are noted for high commercial potential due to their excellent energy efficiency, possibility of direct and various fuel use. The major attempts of current SOFCs technology are closely related to reduce the operating temperature. There are two main approaches including vacuum deposition and chemical solution deposition techniques for fabrication of the LSC layer. The chemical solution deposition techniques have many advantages over the vacuum deposition techniques such as low-cost and possibility of microstructure density control. In this study, the LSC sol was synthesized by using a Pechini method and was tailored under various pH value (pH = 1, 2, 4, 6, 7, 8, 10, 12) in the synthesis process. The precursor solution was prepared from nitrates of the metal ion, citric acid and ethylene glycol with a pH value controlled by ammonia hydroxide solution. The influence of the pH condition in the phase morphology was characterized by XRD, SEM and FT-IR measurements. The LSC sol was stable at pH 1, 2, 8, 10, 12 for several months at room temperature. Also according to XRD patterns, the second phase disappeared after calcination at the temperature of 1100°C with stable LSC sols. SEM and FT-IR analysis showed that the phase was pure, formation of perovskite-type oxide and the nano-scale microstructures. |
