- 學位論文
高溫型固態氧化物燃料電池之製程與特性研究
Fabrication and Characterization of High Temperature Solid Oxide Fuel Cells
摘要
為了增進高溫型固態氧化物燃料電池發電效率及降低操作溫度，本實驗使用一般常見的高溫型材料，電解質為8YSZ；陽極為NiO-9YSZ；陰極為20LSM-8YSZ，先研製多孔性NiO-9YSZ陽極基材再以網印法網印上8YSZ電解質層薄膜而後進行燒結，接續再網印上20LSM-YSZ陰極層後經燒結完成單元電池製作。利用不同網印次數來改變電解質與陰極的膜厚，並藉由不同之燒結溫度來獲得緻密的電解質層與多孔的陰極層。最後將製備完成的單元電池置於固態氧化物燃料電池量測平台上，利用金環作為封裝材料，來了解不同製程下各單元電池的特性，並利用場發式電子顯微鏡來觀察單元電池的微結構。研究發現於1400oC燒結的陽極基材與電解質層於1450oC燒製時斷面最為緻密，但表面仍有些許孔洞。於1350oC燒結的陽極基材與電解質層於1450oC燒製，發現電解質層表面孔洞明顯減少，增加了網印法下電解質的緻密性。陰極層與陽極基材的微結構皆為多孔狀。
並列摘要
In order to enhance high-temperature solid oxide fuel cell power generation efficiency and lower operating temperature. The experimental was used of general type of high-temperature materials. The composition of electrolyte, anode and cathode is 8YSZ, NiO-9YSZ and 20LSM-8YSZ respectively. First of all, the experimental manufactured porous anode substrate (NiO-9YSZ). Then, printed 8YSZ electrolyte layer on anode substrate for screen printing and sintering. Finally, printed 20LSM-8YSZ cathode layer on electrolyte and sintering. Printing used of different number of times to change the electrolyte and cathode thickness, and by different sintering temperature to achieve dense electrolyte layer and porous cathode layer. The full cell was located in solid oxide fuel cell measurement platform and sealed with golden circle. To understand the characteristics of cells with different processes, and observed microstructure of cells with FE-SEM. In our study, anode and electrolyte were sintered under 1400oC and 1450oC respectively to find that cross-section of electrolyte is densification, but there were still some pores on surface of electrolyte. Anode and electrolyte were sintered under 1350oC and 1450oC respectively to find that surface pores of electrolyte were reduced and increase densification of electrolyte for screen printing. Microstructure of anode and cathode layer had many micro-pores.