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Results and discussion crossover. This result was similar when 1.0 wt% F-MOR was used in the MEA. Therefore, there was no future study on the 1.0 wt% SULFO-MOR modified binding layer MEA. 4.5.2 Optimal DMFC Operating Temperature Using SULFO-MOR MEA The process of fabricating SULFO-MOR MEA was followed the procedure described in chapter three. Briefly, sulfonated mordenite sample (0.0036g) was mixed with 0.1215 g of Nafion solution (20wt %) in 5.0 ml acetone. The mixture was sprayed between the anode and the Nafion 117 membrane as a binding layer. From previous experiments with the F-MOR it was found that 0.5 wt% of the inorganic filler was the ideal target weight percentage. Therefore, this study focused on 0.5 wt% loading. This was made by spraying three layers equally until 0.5 wt% SULFO-MOR (MPTS) of the modified binding layer MEA was achieved. The SULFO-MOR MEA was hot pressed at 130°C for 30 minutes followed by overnight hydration in the fuel cell. Figure 4.8 shows the polarization curve of SULFO-MOR MEA at a range of temperature 40°C to 70°C in DMFC. 1M 70°C 60°C 50°C 40°C 0.7 0.6 0.5 0.4 0.3 0.2 0.1 100 90 80 70 60 50 40 30 20 10 00 0 100 200 300 400 500 600 700 800 Current Density (mA/cm2) Figure 4.8 Polarization curve and power density of 0.5 wt% SULFO-MOR modified binding layer MEA in DMFC using 1.0 M methanol and temperature range from 40°C to 70°C Sirhan AL-Batty Page 139 Voltage (v) Power Density (mW/cm2)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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