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Chapter 4 Nafion®/H-ZSM-5 composite membranes with superior performance for DMFCs shows the best performance. This is shown clearly at the power density curves (Figure 10b). DEZ25-5 composite membrane shows better perform- ance than DE2020 and DEZ50-1 membrane at low and high current den- sity regions. Our results suggest that the methanol cross-over seems to be more critical and/or important to achieve better DMFC performance. This is consistent with our earlier work for Nafion-PE (N-PE) composite membrane [18]. N-PE with lower methanol cross-over than Nafion shows better DMFC performance than Nafion even though it has lower proton conductivity than Nafion. 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 320 280 240 200 160 120 80 40 2000 0 D E2 0 2 0 D EZ 25-5 D EZ 50-1 D E2 0 2 0 D EZ 2 5 - 5 D EZ 5 0 - 1 0 400 800 1200 1600 0 400 800 Current Density (mA/cm ) 2 Current Density (mA/cm ) 1200 2 1600 2000 Figure 10. Typical (a) polarization and (b) power density curves of DE2020, DEZ50-1 and DEZ25-5 membranes on the 5th measurement day in the DMFC. 4. Conclusions In this study, composite membranes were prepared by mixing H-ZSM-5 zeolites with DE2020 dispersion and thoroughly characterized. All composite membranes have lower methanol permeabilities and higher proton conductivities than pure DE2020 membrane. Two of the membranes: DEZ25-5 and DEZ50-1 were further tested in DMFC due to their low methanol cross-over and high proton conductivity, respectively. The DEZ25-5 membrane showed the best DMFC results. Its maximum power density (MPD) was more stable throughout the measurements and it reached the highest MPD at the end of the 5th day. 68 Cell Voltage (V) Power Density (mW/cm2)PDF Image | Development of membrane materials for direct methanol fuel cells
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