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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications Chapter 2 Dimensionally stable Nafion-polyethylene composite membranes for direct methanol fuel cell applications M. Hakan Yildirim, Dimitris Stamatialis, Matthias Wessling Abstract Nafion® impregnated Solupor®, microporous UHMWPE film, (N-PE), Nafion®117 (N117) and a membrane prepared using a DE2020 Nafion® dispersion (DE2020) were characterized with respect to their swelling de- gree, methanol cross-over, proton conductivity and DMFC performance at various methanol concentrations in order to understand the effect of im- pregnation of an ion-conductive polymer membrane to the fuel cell perform- ance. Introducing Nafion® into the pores of Solupor® causes reduction of both methanol cross-over and proton conductivity. Low proton conductivity of the N-PE membrane is compensated by its significantly low methanol cross- over and this leads to better DMFC performance at 1 and 6M concentra- tions in comparison to N117 and DE2020 membranes. In addition to that, N-PE composite membrane has high dimensional stability, low membrane thickness, good performance using less Nafion® ionomer, with reduced cost. In addition to the real fuel cell measurements, characteristic β values of the membranes were also calculated using both thickness dependent and inde- pendent methods. All characteristic values failed to predict the real fuel cell performance and should be used with caution. Yildirim, M.H. et al. J. Membr. Sci., 2008. 321(2): p. 364. 15PDF Image | Development of membrane materials for direct methanol fuel cells
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