| Summary: | 碩士 === 國立交通大學 === 跨領域分子科學國際碩士學位學程 === 106 === In this thesis, La2(Ce2V0.2)2O7-δ (LCVO),developed by our lab, was synthesized by glycine-nitrate method. LCVO combines with commercial electrolyte material La0.8Sr0.2Ga0.8Mg0.2O3-(LSGM) and commercial cathode material (La0.60Sr0.40)0.95Co0.20Fe0.80O3-δ to study the performance of single cell at new device. At the same time, we study the fabrication of ceramics to improve the quality of single cells.
For the fabrication, we used Tape casting method to fabricate electrolyte-supported cells. And we found out the best ratio of solvents and milling program of slurry which was milled by Planetary Mills, and we can produce green tape without the bubbles. TGA told us there were endothermic reaction at two ranges: from 178.2°C to 197.4°C and from 358.8°C to 394.7°C. We modified the sintering program based on this result. Last step, we pressed the ceramic by the alumina plates and sintered at target temperature with 200°C /h to flatter the ceramics.
We used Pyrex glass sealant, made by our lab, to replace the previous ceramics sealant, and found this glass sealant can tolerate up to 0.09L/min flow rate at 800°C. For anode half cell, we found that the major open circuit potential (OCP) was provided by anode cite. For cathode half cell, ionic conductivity of LSGM was higher than pure LSGM from 600°C to 750°C. Instead, ionic conductivity of pure LSGM was higher than LSGM of cathode half cell at 800°C.
For LCVO-LSGM/LSGM/LSCF-LSGM and LCVO/LSGM/LSCF, OCP of both cells were bewtween 1.08 V and 1.14 V, and the cells were considered to be sealed well between 600°C and 800°C. However, the former’s power density is lower than the latter one. Repeating experiments and based on SEM, the LCVO content of the former is less than the latter. LSGM, mixed with LCVO, made the porosity of anode less than pure LCVO anode. Therefore, the power density of LCVO/LSGM/LSCF could reach to 0.389 W/cm2。
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