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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications OCV value of the membrane gets lower. In fact the OCV values correspond to the membrane thickness and follow the order of N117 (185μm) > DE2020 (80μm) > N-PE (26μm) (see Fig. 9a). Chen et al [24] also reported lower OCV for their composite membrane in comparison to the thicker Nafion® mem- brane. Small membrane thickness also leads to a shorter pathway for the protons to pass through the membrane. High proton flux compensates the high methanol flux of the composite membrane and leads to a better overall performance of the composite membrane than N117 and DE2020 mem- branes. 0.9 300 0.8 0.7 0.6 200 0.5 150 0.4 0.3 100 0.2 0.1 50 (a) N1 17 N-PE DE2020 0.0 0 0 200 400 600 800 1000 1200 1400 1600 Current Density [mA/cm2] 0 200 400 600 800 1000 1200 1400 1600 Current Density [mA/cm2] Figure 9. Polarization and power density curves of N-PE, N117 and DE2020 membranes (at 1M). In the literature one can find several papers reporting the performance of Nafion® impregnated membranes. The results are not always easy to com- pare with our own, since the experimental conditions differ. For example, Chen et al [24], Lin et al [25] and Huang et al [26] also measured the per- formances of their Nafion® impregnated PTFE (N-PTFE) composite mem- branes and N112 or N117 membranes. Measurements were performed with 2M and 5M methanol solutions which were fed to the anode at a flow rate of 5 ml/min. Dry oxygen was fed to the cathode at a flow rate of 150 ml/min. The temperature of the cell was 70°C for Lin et al [25] and Huang et al [26] and 80°C for Chen et al [24]. Anode and cathode contained 4mg/cm2 Pt-Ru and 2mg/cm2 Pt, respectively. At 2M methanol concentration, the N-PTFE 30 250 N1 17 (b) N-PE DE 202 0 Cell voltage [V] Power Density [mW/cm2]PDF Image | Development of membrane materials for direct methanol fuel cells
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