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Chapter 3 Impregnated membranes for DMFCs at high methanol concentrations over, the performance increases with increasing methanol concentration, which is also an advantage over the perfluorinated Nafion based mem- branes. SPPEK1.4 220 220 200 180 180 160 160 140 140 120 120 100 100 S P PE K 1. 4- P E 80 60 40 20 200 80 60 40 20 1M 3M 6M 1M 3M 6M 00 0 300 600 900 1200 1500 1800 Current density [mA/cm2] 0 300 600 900 1200 1500 1800 Current density [mA/cm2] Figure 8. Power density curves of SPPEK1.4 and SPPEK1.4-PE membranes at various methanol concentrations. Figure 9 summarizes the DMFC measurements of this study and compares our results with our previous study for N117 and N-PE membranes [13]. It presents the maximum power densities as a function of methanol concentration at the anode side of the fuel cell (lines are used to guide the eye of the reader and do not correspond to experimental result). The power density of the N117 and N-PE is higher than SPPEK1.4 and SPPEK1.4-PE at 1M, but decreases sharply at 6M. The maximum power density of SPPEK1.4 increases with increasing methanol concentration up to 3M and then shows a slight decrease at 6M, but the power density at 6M is still higher than 1M. The power density of the SPPEK1.4-PE is always higher than SPPEK1.4 and interestingly is independent of methanol concentration above 3M. The performance of the SPPEK1.4-PE composite membrane at 6M is higher not only than the pure SPPEK1.4 membrane, but also significantly higher than those results of N117 and N-PE membranes at 6M. This shows that the SPPEK1.4-PE membrane is a very promising material for DMFC applications at high methanol concentrations. In order to compete with Li- Ion batteries, high methanol concentrations should be used as a fuel in DMFCs and SPPEK1.4-PE is the best material at 6M in comparison to all the other materials we have tested. 48 Power density [mW/cm2] Power density [mW/cm2]PDF Image | Development of membrane materials for direct methanol fuel cells
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