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Results and discussion The proton conductivity at 2.0 M and 4.0 M was directly proportional with the fuel cell temperature in both standard and 0.5 wt% F-MOR MEAs. This behaviour was noticed in Figure 6.1 (Nyquist plot). The highest proton conductivity of F-MOR and standard MEAs was at 70°C. Following the temperature effect on the proton conductivity, the effect of methanol concentration on the proton conductivity using standard MEA in DMFC was plotted. Figure 6.8 shows the proton conductivity of 0.5 wt% F-MOR and standard MEAs at 1.0 M, 2.0 M, and 4.0 M and 70°C fuel cell temperature. 70°C Standard MEA 0.5% MOR 0.10650.1067 0.1288 0.1231 0.11 0.1191 0.1143 0.13 0.09 0.07 0.05 0.03 0.01 -0.01 124 Methanol Concentration [M] Figure 6.8 Proton conductivity of standard MEA and 0.5 wt% F-MOR MEA at different methanol concentration 1.0 M, 2.0 M, and 4.0 M and 70°C in DMFC In Figure 6.8 the proton conductivity decreases as the methanol concentration decrease. This indicates an inverse relation between the proton conductivity and methanol concentration feed in DMFC. In all cases, the proton conductivity of the 0.5 wt% F-MOR was less than the standard MEA due to the relatively poor conductivity of zeolite to Nafion. It was reported in the literature [176] that the proton conductivity of the polymer electrolyte membrane depends on the membrane humidity and effected drastically by the water content in the fuel cell [176]. Due to any reason, the membrane has less water content at high methanol concentration which increases the ohmic resistivity within the fuel cell thus; decrease the proton conductivity at higher methanol molarity. Sirhan AL-Batty Page 162 Proton conductivity (S/cm)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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