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Results and discussion 140 120 100 80 60 40 20 0 Power Denisty mW/cm2 Proton Conductivity (mS/cm) 129 Methanol Crossover (mA/cm2) 123 129 92.2 84 SULFO-MOR 55 90 79.9 80 F-MOR Standard Figure 6.18 Power density, methanol crossover, and proton conductivity of the standard MEA, F-MOR, and SULFO-MOR MEAs at 70°C and 1.0 M in DMFC The comparison was made in Figure 6.18 in order to keep the values of the power density, methanol crossover, and proton conductivities of the three MEA in the same range. The proton conductivities were converted to milli Siemens to fit the comparison range on y-axis. The methanol crossover of the standard MEA was the highest among all the three MEA. This could be the reason behind the drop in the power density. The next MEA (F-MOR) showed an improvement in terms of methanol crossover but the proton conductivity was lowest among all the three MEA. To overcome this issue the F-MOR was functionalized with sulfonic acid group (HSO3-). The power density of the SULFO-MOR MEA was the highest among all three MEA. The sulfonation of mordenite increased the proton conductivity when comparing with F- MOR. This could be the reason behind the highest power density. However, standard MEA still shows the highest proton conductivities among all the three MEAs. Since the sulfonation with 0.5 wt% enhanced the proton conductivity in was proposed to increase the weight percentage of the SULFO-MOR and study the effect on the power density, proton conductivities and methanol crossover. But the 1.0 wt% sulfonated showed low power density due to the high proton resistivity. This resistivity was resulted from increasing the thickness of the MEA. Increasing membrane thickness can affect the proton resistivity in the fuel cell [29]. The following section will show the proton conductivity and the methanol crossover for GO binding layer MEA. Sirhan AL-Batty Page 172PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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