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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications composite membrane and the middle layer of the composite membrane, re- spectively. Table 1 presents the results where one can see that the metha- nol permeability of the middle layer seems to determine the overall metha- nol permeability. The low methanol permeability at the middle layer is probably due to the presence of the non-conductive hydrophobic Solupor® and the presence of the unfilled pores of PE (as indicated by the porosity calculation) contributes to this, too. 400 350 300 250 200 150 100 50 0 Figure 3. Methanol permeabilities of N-PE, DE2020 and N117 membranes as a function of methanol concentration. Table 1. Methanol permeabilities (in 1M MeOH), diffusivities (in 1M MeOH) and proton conduc- tivities (in ultra pure water (upw)) of the membranes. DE2020 N 11 7 N-PE 0 2 4 6 8 10 Methanol concentration [M] Membrane Permeability (x10-8)[cm2/s] (in 1M MeOH) Diffusivity (x10-8)[cm2/s] (in 1M MeOH) Conductivity (x10-2) [S/cm] (in upw) 3.5 6.3 0.6 0.4 DE2020 220 N117 150 N-PE 95 N-PE middle layer* 66 *Estimated by resistance in series model. 23 16 9 0.8 0.5 Methanol permeability(x10-8)[cm2/s]PDF Image | Development of membrane materials for direct methanol fuel cells
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