| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 104 === The purpose of this study is to investigate the key materials for intermediate temperature SOFC. In the first part of this study, an intermediate phase method was used to synthesize perovskite phase La1-xSrxGa1-yMgyO3-δ (LSGM), which is used as the electrolyte material of intermediate temperature SOFC. The second part is to prepare the La1-xSrxCo1-yFeyO3 (LSCF) cathode via electrospinning method. In the first part, the required elements were separated to synthesize the target material by two stages. The Pechini method was applied to prepare two types of intermediate phase LaGaO3 and MgGa2O4 in the first stage, and then the other two metal oxides were added by solid-state reaction method in the second stage. With the doubly-doping of the other two metal oxides, La1-xSrxGa1-yMgyO3-δ of desired perovskite phase can be obtained successfully. It was observed that La1-xSrxGa1-yMgyO3-δ of desired perovskite phase could be obtained at relatively lower temperatures via the two-stage reaction with LaGaO3 as the intermediate phase. On the other hand, the materials prepared from MgGa2O4 intermediate phase required sintering at 1500 oC to get the target perovskite phase. In the second part of this study, electrospinning method was applied to fabricate cathode coating on the electrolyte surface. It is known that electrospinning technique can increase TPB sites and continuous pathway for charge transfer. Here we tried to find out a proper method for improving the contact between cathode and electrolyte.
|
|---|
