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Results and discussion Using LSV technique, Figure 6.4 shows the sweep voltage and response current at 1.0 M, 2.0 M, and 4.0 M. 350 300 250 200 150 100 50 1M 2M 4M 0 0 0.2 0.4 0.6 0.8 1 Potential (v) Figure 6.4 Methanol crossover of standard MEA in DMFC at different methanol concentrations and 70°C fuel cell temperature. The methanol crossover increased by increasing the methanol concentration at 70°C. Both Figure 6.3 and Figure 6.4 agreed with the results obtained in sections 4.3and 5.2 (Effect of temperature and concentration on Standard MEA in DMFC). This indicates that the maximum power density of standard MEA in DMFC can be obtained by following the operational parameters listed in Table 4-2 Standard fuel cell conditioning operating parameter. As has been mentioned earlier, the purpose of this work is to fabricate modified binding layer MEA which possess good proton transport properties as well as lower methanol permeability. Therefore, it was necessary to evaluate the proton resistivity and methanol permeability for standard MEA in DMFC and set a base line for comparison purposes with modified binding layer MEAs. The following section will show the proton conductivity and methanol crossover of functionalized mordenite binding layer MEA at different fuel cell operating temperature and methanol concentration in DMFC. Sirhan AL-Batty Page 159 Current Density (mA/cm2)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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