- 學位論文
Nafion/MCM-22複合材料於直接甲醇燃料電池質子交換膜之應用
Nafion/MCM-22 Hybrid Material as Proton Exchange Membranes for DMFC Application
摘要
燃料電池具有高發電效率以及低噪音等優點，因此在近年來越來越受到重視，其中在低溫下運作的直接甲醇燃料電池能被應用在攜帶式電子產品上，加上其具有低汙染以及比以氫氣為燃料的質子交換膜燃料電池來的安全，因此成為近年來熱門的開發目標。然而，甲醇燃料易經由質子交換膜由陽極穿透到陰極，造成使用效率下降。 本研究嘗試在Nafion溶液中加入MCM-22沸石，製備Nafion/MCM-22複合膜，希望能降低甲醇穿透度並提升質子傳導度。本研究第一部分為合成出MCM-22(P)，接著利用反微胞的方式使其層間分散，並嘗試萃取和嫁接等後處理方式來應用在經過分散的材料上，以及藉由煆燒移除MCM-22(P)的模板得到MCM-22。第二部分為複合膜的製備，複合膜是以溶劑揮發法製成，最後實際應用在直接甲醇燃料電池上，並比較不同材料和添加量對膜的影響。 MCM-22等材料以X光繞射儀、氮氣吸脫附、掃描式電子顯微鏡、熱重分析儀、傅立葉轉換紅外線光譜儀進行分析。複合膜以甲醇擴散實驗和交流阻抗儀分析甲醇穿透度和質子傳導度，剖面型態則由掃描式電子顯微鏡來觀察，並實際做成膜電極組測試複合膜在甲醇燃料電池上的效果。
並列摘要
Direct methanol fuel cell (DMFC) is considered as a highly efficient power source for portable devices. One of the main drawbacks of DMFC in practical application is methanol permeability through proton exchange membrane, which lowers down the cell performance. In this study, layered zeolite MCM-22 was incorporated into Nafion solution to make composite membranes. The first part of my research is synthesis of MCM-22(P) and MCM-22. We also used inverse-micelle method to dispersive the layered structure of MCM-22(P) to make dis-MCM-22 then modified it by grafting and extraction. The second part of my research is preparation of composite membranes by solvent recasting technique. The influence of different treatments and amounts of MCM-22(P) was examined on the performances of resultant membranes in methanol permeability, proton conductivity and the test of DMFC. The characterization of zeolite is by XRD, BET, SEM, TGA and FT-IR. The performance of membranes is tested by methanol diffusion, proton conductivity, SEM and DMFC experiments.