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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications When the electrodes are hot pressed at 2bar, the MEA produces around 220mW/cm2 (Fig. 6a). In the case of 10 and 29 bar (Fig. 6b, c), MEA per- forms slightly better and the maximum value is about 250mW/cm2. How- ever, it seems that the maximum power density of MEA prepared at 29 bar pressure is rather unstable in time. In the beginning of the day it shows an increase and then starts to decrease till the end of the measurement time. MEA’s prepared under 10 bar pressure perform slightly better and are also stable at least after the 3rd day. Based on these results, we used 10 bar to prepare MEAs with N117, N-PE and DE2020 membranes, reported in the following sections. Figure 7 shows the polarization curves of N117 membrane on day 1 and day 4 for various MEA preparation pressures. The performances of each MEA on day 4 are significantly improved in comparison to day 1 due to the condi- tioning effects of all measurements on the membrane. N117 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 Figure 7. Day 1 (filled symbols) and day 4 (open symbols) performance of N117 membrane for various MEA preparation pressures (1M methanol concentration). Figure 8 shows the maximum power densities of various membranes as a function of time. The concentration of methanol at the anode side was 1M. Each symbol in the graph corresponds to a different MEA. For all mem- branes, the maximum power density increases in time and reaches a pla- teau. The average power densities of N-PE, N117 and DE2020 membranes 28 2 bar 10 bar 29 bar DAY 4 DAY 1 0 200 400 600 800 1000 1200 1400 Current Density [mA/cm2] Cell voltage [V]PDF Image | Development of membrane materials for direct methanol fuel cells
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