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Results and discussion At medium current density range, the ohmic loss of the F-MOR MEA was greater that the SULFO-MOR MEA. The ohmic loss mainly caused by the proton flow across the membrane and the ionomer which enhance the triple phase boundary between the gas diffusion layer, catalyst layer and the membrane. Increasing the ions flow resistance can increase the voltage loss in the fuel cell. In another words, enhancing the proton flow across the membrane can improve the cell voltage thus improve the power density. Chang-Chun Ke et al [169] reported that the sulfonic group on silica oxide surface increases the proton conductivity in the fuel cell. Possibly this was the case with the SULFO-MOR and F-MOR MEAs in Figure 6.12. The proton benefits from the sulfonic group on the surface of the mordenite in reducing the internal resistance in the fuel cell. At high current density of the polarization curve, the voltage drops rapidly to zero due to the crossover of methanol. It was seen that F-MOR MEA was able to reduce the methanol crossover in the fuel cell when comparing with standard MEA. Similar behaviour was expected to be seen when the SULFO-MOR MEA. Therefore, a detail comparing of three MEAs will be illustrated by the next section. However, to carry on investigation regarding the improvement of the power density, the EIS of F-MOR and SULFO-MOR where plotted together. Figure 6.13 shows the Nyquist of 0.5 wt% F- MOR and 0.5 wt% SULFO-MOR MEAs at 70°C with 1.0 M methanol in DMFC. Figure 6.13 Nyquist plot of 0.5 wt% F-MOR and 0.5 wt% SULFO-MOR MEAs at 70°C and 1.0 M methanol anode feed in DMFC. Sirhan AL-Batty Page 167PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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