FUEL 17 |
| Polymer electrolyte membrane fuel cell (PEMFC) has been received much attention for the past decades as it is a simple and clean alternative energy resource developed from the proton exchange system in the polymeric electrolyte membrane. At present, perfluorosulfonic acid polymer, Nafion®, is known as an effective membrane providing the proton conductivity as high as 10-2 S/cm in its fully hydrated state at 60-80°C. Currently, heterocyclic aromatic compounds, especially imidazole, have been proposed for the protonic charge carrier functioning even at high temperature (above 120°C) without the needs of hydration. Here, we challenge a copolymer system consisting of proton donor moiety of acrylic acid and proton acceptor group of 4-vinylimidazole. From impedance preliminary result, Nafion shows the proton conductivity in the range of 20-50 mS/cm under fully hydrate condition. For poly(AA-co-4-VIm) with monomer feed ratio of 19:1, the proton conductivity under anhydrous condition is stable at 15 mS/cm up to 125°C. In the presentation, we will cover the synthesis, characterization, membrane preparation, thermal stability and the proton exchange properties. |
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Fuel Cell Technology: Polymer Electrolyte Membrane Fuel Cell Systems
8:25 AM-12:00 PM, Sunday, August 19, 2007 Boston Park Plaza -- Cambridge Rm, Oral
Division of Fuel Chemistry |