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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications PE (Fig. 10a), N117 (Fig. 10b) and DE2020 (Fig. 10c) membranes are 145mW/cm2, 130mW/cm2 and 115mW/cm2, respectively. Figure 11 presents polarization and power density curves corresponding to the plateau values of Fig. 10. The OCV of N117 is higher than N-PE and DE2020 due to its higher thickness. Although DE2020 is thicker than N- PE, they have similar OCV values, probably due to the high methanol cross- over through the DE2020 membrane. N-PE performs better than N117 and DE2020 when the current density is above 400mA/cm2. N117 and DE2020 show mass transport limitations at around 800mA/cm2, whereas N-PE reaches up to 1200mA/cm2 (Fig. 11a). Lin et al [25] and Huang et al [26] have also measured the performances of their Nafion impregnated PTFE membrane and N112 membrane at 5M methanol solution. Both N-PTFE and N112 membranes showed similar performances, approximately 30mW/cm2, much lower than the measurements at 2M. The same behavior is observed in our measurements as well. The performance at 6M of all three membranes is lower than in 1M. However, the N-PE shows better per- formance than both N117 and DE2020. This may be due to the low metha- nol cross-over and to the dimensional stability of N-PE (see Fig. 2). 0.7 160 0.6 0.5 0.4 0.3 0.2 0.1 0.0 140 120 100 80 60 40 20 0 (a) N117 N-PE DE2020 0 200 400 600 800 1000 1200 1400 Current Density [mA/cm2] 0 200 400 600 800 1000 1200 1400 Current Density [mA/cm2] Figure 11. Polarization and power density curves of N-PE, N117 and DE2020 membranes (at 6M). In section 3.5, characteristic values of the investigated membranes were calculated using thickness dependent (β2 and β3) and independent (β1) methods to predict the fuel cell performance. Both methods predicted that the N117 membrane will perform better than N-PE and DE2020 membranes 32 (b) N117 N-PE DE2020 Cell voltage [V] Power Density [mW/cm2]PDF Image | Development of membrane materials for direct methanol fuel cells
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