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Chapter 5 Micro-structured Nafion membranes for DMFC applications In conclusion, it seems that the μs N117 is better than hp N117 and N117 due to better catalyst utilization. In DMFC stacks, which contain multiple MEAs, this improvement can lead to a higher power output gain and/or lower system volume. It is finally important to note that besides μs N117 with lined microstructure, we also prepared squared micro-structured membranes by embossing the line structure on the membrane twice; once normal and once in 90° to the previous. The power density of this micro- structured membrane was also around 230mW/cm2; very similar to that of line structured one. We think that more work needs to be done to obtain even better DMFC performance. The preparation of MEA without damaging the microstructure of the membrane and one of the critical issues to be resolved. 1.0 240 a) 0.8 0.6 0.4 0.2 200 160 120 80 b) hp N117 μs N117 N117 hp N117 μs N117 N117 40 0.0 0 0 200 400 600 800 1000 1200 1400 Current density[mA/cm2] 0 200 400 600 800 1000 1200 1400 Currentdensity [mA/cm2] Figure 8 (a) Polarization and (b)power density curves of line structured (μs), heat and pressure treated (hp) and normal N117 membranes. 4. Conclusions In the present work, N117, hp N117 and μs N117 membranes were prepared and characterized to understand the effect of heat and pressure treatment and also the micro-structuring on the overall membrane performance. Methanol fluxes through hp N117 and μs N117 membranes are factor of 3 lower than normal N117 membrane probably due to compaction of mem- brane structure leading to decrease in water content and methanol flux of 82 Cell voltage [V] P o w e r d e n s i t y [ m W / c m2 ]PDF Image | Development of membrane materials for direct methanol fuel cells
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