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Results and discussion 100 80 60 40 20 0 Nafion 117 0.5% Loading 1% Loadoing 0.25% Loading 0.75% Loading 1M 40 50 60 70 Temperature ( ̊C) Figure 4.3 Extracted power densities peaks of standard MEA and F-MOR MEAs modified binding layer loadings (0.25wt % to 1.0wt %) in DMFC at different operating temperatures and 1.0 M methanol feed. This comparison was made at 1.0 M methanol feed flow rate as a function of temperature. The maximum power density obtained from Figure 4.3 was 80 mW/cm2 at 70°C for the 0.5 wt% F-MOR MEA followed by the standard MEA 50 mW/cm2 at 70°C. This is an excellent improvement in the fuel cell power density when compare with the previous work [166]. Between 0.25 wt% and 0.75 wt%, the power density peaks overlapped at 60°C and then showed higher performance at 70°C. It was expected to be a linear correlation between 0 wt%, 0.25 wt%, and 0.5 wt%. However, at 40°C both MEAs (0 wt% and 0.5 wt%) show better performance than the other MEAs. Taking in account the maximum power density of DMFC was obtained at 70°C, the 0.5 wt% F-MOR modified binding layer MEA showed around 60% better performance than the standard MEA. This may attributed to the reduction of methanol crossover in the fuel cell which will be tested later in work. However, 0.5 wt% of F- MOR was the ideal loading at when using 1.0 M methanol feed. At 2.0 M methanol concentration, 0.5 wt% F-MOR MEA power density is higher than standard MEA. Which indicates that less methanol was crossing over through the membrane. Figure 4.4 shows the extracted power densities peak at different fuel cell temperatures with 2.0 M of methanol concentrations. Sirhan AL-Batty Page 133 Maximum Power Density (mW/cm2)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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