最佳化NiO-YSZ的陽極在固態氧化物燃料電池上的應用

Optimization of Ni-YSZ Anode in SOFC Application

詹紹華(Shao-Hau Chan) ； 陳政良(Chung-Liang Chen) ； 王禎翰(Jeng-Han Wang)

《化學》 70卷2期 (2012/06) Pp. 139-151

https://doi.org/10.6623/chem.2012013

摘要

陽極為影響固態氧物化物燃料電池性能的重要因素，而一般最常用在固態氧化物燃料電池的陽極為NiO-YSZ，本篇研究的目的是要製備出一個性能最佳以NiO-YSZ為陽極的固態氧化物燃料電池。首先從合成NiO-YSZ粉體開始，用了四種不同的化學方法合成，燃燒法、共沉澱法、凝膠-溶膠法和 水熱法，並且利用XRD分析判定結構，以選出最好的合成粉體方法。之後再從改變NiO與YSZ的比例、陽極孔隙率、陽極厚度、電解質厚度、共壓時的壓力以及陰極這些條件來製備出最佳化電池，並拿去做SEM的檢定與電化學測試測性能。研究結果顯示製備NiO-YSZ陽極粉體最好的方法為燃燒法，用燃燒法合成出來的粉體蓬鬆，顆粒大小分布均勻，產量高，重要的是易於共壓操作。最佳的電池為NiO與YSZ比例為60、陽極孔隙率10%、陽極厚度為500 mg、YSZ電解質厚度為8 mg、共壓壓力為10 MPa以及網版印刷LSM於陰極，而最大功率為在800°C時達到0.62 w/cm^2。

關鍵字

Ni-YSZ陽極 ； 固態氧化物燃料電池 ； GNP燃燒法 ； 共壓法

並列摘要

The objective of this dissertation is to determine the best condition of Ni-YSZ based anode materials in solid oxide fuel cell (SOFC) application. First, Ni-YSZ powder is synthesis from four chemical methods: GNP combustion, co-precipitation, sol-gel and hydrothermal techniques. The synthesized powder is characterized by X-ray diffractometer (XRD) to analyze the phasecomposition. Second, the GNP synthesized Ni-YSZ, which is considered as the finest powder with the most foam-like structure and homogeneous distribution, is further employed to fabricate anode-supported SOFC by co-pressing method and characterized by SEM. Finally, the molar ratio of NiO/YSZ, anodic porosity, anodic thickness, electrolyte thickness and co-pressing pressure have been systematically examined by electrochemical measurement. The cell is optimized at 6/4, 10%, 900 μm, 20 μm and 250 MPa, respectively, as cells are tested in the pure H_2 fuel at the temperature range of 600-800 °C. Furthermore, the best cathode materials of LSM is screen printed on the optimized fuel cell with the maximum power density of 0.62 W/cm^2 at 800 °C.

並列關鍵字

Ni-YSZ anode ； SOFC ； GNP combustion method ； Co-pressing method