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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications are 280mW/cm2 (Fig. 8a), 225mW/cm2 (Fig. 8b) and 250mW/cm2 (Fig. 8c), respectively. 400 350 300 250 200 150 100 400 350 300 250 200 150 100 50 N117 (b) 400 350 300 250 200 150 100 50 0 0 200 400 600 800 1000 Time [min] 1200 1400 50 00 0 200 400 600 800 1000 1200 1400 Time [min] N -P E ( a ) Figure 8. Maximum power densities of N-PE, N117 and DE2020 membranes (at 1M) as a func- tion of time. The different symbols in each case correspond to different MEA. Figure 9 presents polarization and power density curves corresponding to the plateau values of Fig. 8. N-PE is the thinnest membrane of all three and has the lowest open cell voltage (OCV) (~0.65V). When the membrane thick- ness is small the pathway for methanol cross-over gets short. Therefore the 29 D E2 0 2 0 ( c) 0 200 400 600 800 1000 1200 1400 Time [min] Maximum Power Denstiy [mW/cm2] Maximum Power Denstiy [mW/cm2] Maximum Power Denstiy [mW/cm2]PDF Image | Development of membrane materials for direct methanol fuel cells
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