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Chapter 3 Impregnated membranes for DMFCs at high methanol concentrations with the experimental conditions used there. Many parameters can influence the proton conductivity i.e. pre-treatment, casting solvent, etc. For example, in literature N,N-Dimethylacetamide (DMAc) was often used as a casting solvent [19, 21], while our membranes were prepared in NMP. Figure 6 shows the proton conductivities of the membranes as a function of methanol concentration. Proton conductivities of SPPEK1.4 and SPPEK1.6 are in the same range for methanol concentration up to 6M. At higher methanol concentration, the proton conductivity of SPPEK1.6 increases sharply, whereas increases modestly for SPPEK1.4. SD measurements show the same effect. The rate of increase is smaller for SPPEK1.4 than SPPEK1.6. It seems that there is a threshold for swelling as well as conductivity at ~6M especially for the SPPEK1.6 membrane. This phenomenon is not observed for the SPPEK-PE impregnated membranes. The conductivity of those membranes is independent of the methanol concentration at around 0.1x10-2 S/cm (Fig. 6) and a factor 3 lower than pure membranes, due to the presence of the non-conductive PE material. For comparison, the proton conductivities of N117 and N-PE membranes are much higher and they are in the range of 5-6x10-2 S/cm and 0.5-3x10-2 S/cm, respectively for methanol concentrations of 1-10M [13]. 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 Figure 6. Proton conductivities of SPPEK membranes as a function of methanol concentration. 3.5. Single cell performance SPPEK1.4 and SPPEK1.4-PE membranes were selected for further tests in the DMFC due to their low swelling and methanol cross-over. MEAs were 46 SPPEK1.4-PE S P PE K 1. 6 -P E 0 2 4 6 8 10 MeOH concentration [mol/l] SPPEK1.6 SPPEK1.4 Proton Conductivity (*10-2)[S/cm]PDF Image | Development of membrane materials for direct methanol fuel cells
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