| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 94 === Direct Methanol Fuel Cells (DMFCs) possessing several advantage that tally with the alternative energy source demand in the future. And it is considered to one kind of the fuel cells which having the most developed values. Among them, the proton exchange membrane is one of the most important component in the whole fuel cell. The characteristics of the proton exchange membrane will influence the applications of the fuel cells in the future. If the membrane with good thermal stability, it can expand the operating temperature of the fuel cell. With the increasing of the operating temperature, the performance of the fuel cells will be improved greatly. However, it is unable to deliver the proton by water molecules under higher operating temperature, so need different proton transition mechanisms.
This research uses the acidic polymer PAA (poly(acrylic acid)) of different molecular weight combined with the basic polymer P4VP (poly(4-vinylpyridine)) and P(4VPcoS). Then the proton exchange membranes were prepared by the hydrogen bonding and ionic bonding interaction between the acidic and basic polymers. Besides having good thermal stability, there is a new proton transition channel in the membranes. Since the interaction between the acid and base, the acidic and basic functional groups matched with each other. Other few basic polymer that not matched with proton could accept the proton transmitted over around, then deliver to proton defect nearby. This kind of proton transition mechanism like proceeding zip-unzip behavior. If the membrane has the new proton conductive mechanism and thermal stability, it could have the opportunity to apply in the fuel cells under high temperature and anhydrous conditions.
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