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Results and discussion The semicircle in Nyquist plot for F-MOR and SULFO-MOR are almost identical except at the high frequency range (Left hand side) there is slightly different where the semicircle intercept with real axis (z’-axis). The whole diameter of the semicircle represents the resistivity across the MEA whereas as the interception of the semicircle represents the proton resistivity. It can be seen from Figure 6.13 that proton resistivity of 0.5 wt% SULFO-MOR MEA was 0.0609 whereas the proton resistivity of the F-MOR MEA was 0.065. At low frequency range, MEA resistivity shows almost similar width for both MEAs. This indicates that the proton found less transfer resistivity due the presence of the sulfonic group in the SULFO-MOR MEA than F- MOR MEA. This study was made at 70°C with 1.0 M methanol. Therefore it was necessary to investigate the proton conductivities at different fuel cell temperature. Figure 6.14 shows the proton conductivities of standard, 0.5 wt% F-MOR and SULFO-MOR MEAs at different fuel cell temperature in DMFC. 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0% 0.0997 F-Mor (0.5wt%) 0.108 Sulfo-Mor (0.5wt%) 0.129 0.117 40 50 60 70 Temperature [°C] Figure 6.14 Proton conductivities of standard, 0.5 wt% F-MOR and SULFO-MOR MEAs through operating temperature range from 40°C to 70°C in DMFC The proton conductivity increase as the fuel cell temperature increased. The highest proton conductivities of all three MEAs where obtained at 70°C. Through the temperature range from 40°C to 70°C, the SULFO-MOR shows better proton conductivities than F-MOR MEA. This indicates reduction in the proton resistivity across the membrane. At 70°C the proton conductivities of F-MOR MEA was 3% less Sirhan AL-Batty Page 168 Proton conductivity (S/cm)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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