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Results and discussion 6.4.2.1 Mordenite modified binding layer data summary The following table summarized the fuel cell behaviour using different MEAs in DMFC at 70°C and 1.0 M methanol concentration. Table 6-1 Summary of Power density, proton conductivity, and methanol crossover of the standard MEA, F-MOR, and SULFO-MOR MEAs at 70°C and 1.0 M in DMFC DMFC 70°C & 1.0 M MEAs Power Density (mW/cm2) Proton resistivity (Ω) Methanol crossover (mA/cm2) Standard 0.5 wt% F-MOR 0.5 wt% SULFO-MOR 1.0 wt% SULFO-MOR 50.05 79.54 92.34 65.26 0.0604 90.0 0.065 80.0 0.0609 84.0 0.093 76.0 This summarized that 0.5 wt% F-MOR MEA was reducing the methanol crossover but provide poor proton conductivity. Sulfonated mordenite increased the proton conductivity but increased the methanol crossover when comparing with that of F-MOR due to the presence of sulfonic group which attracts water causing the membrane to swell thus passing more methanol through the membrane channels. Increasing the weight percentage loading decreased the methanol crossover and increased the proton resistivity in the fuel cell. The inorganic filler has a unique structure, surface chemistry, and mechanical strength. Therefore, when added inorganic filler to the polymer matrix of the membrane it expected to reduce the methanol crossover. In some cases, increasing the weight percentage of the inorganic filler can increase the methanol crossover due poor distribution of the dispersion phase of filler in to the polymer matrix. It was reported by S.M. Slade et al [178] increasing the wt% of SiO2 (inorganic filler) in the Nafion lowered the MEA performance due to the weak contact particles in the polymer matrix. Sirhan AL-Batty Page 173PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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