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Results and discussion 4.6.1 Effect of Varying Weight Percentage of GO Modified Binding Layer MEA in DMFC In the following study, GO flakes were added to Nafion 117 solution (20wt%) and sonicated with acetone to form homogeneous solution. The required amount of GO was mixed with Nafion to modified GO binding layer and sprayed on the catalyst layer of the anode in order to reduce methanol crossover. Five MEAs were fabricated with different GO weight % per loading (0 wt% -5.0 wt%) to study the effect of weight % of GO in DMFC. Each GO MEA was hot pressed at 80°C for 30 minutes. The hot press temperature was set below 80°C to avoid the reduction of graphene oxide. GO MEAs were placed in DMFC and hydrated overnight with DI water before the run was started. The fuel cell conditioning process was similar to standard MEA and MOR MEAs. Briefly, the fuel cell was first operated at 70°C and 1.0 M methanol concentration. Anode and cathode catalyst loading were 1.0 mg/cm2. The anode and cathode flowrate were 5.0 ml/min and 1.0 L/min respectively. The fuel cell conditioning was carried out by applying a current (step of 0.1 A) until reaching zero voltage. This was done from five to six times until maximum power density was achieved. The first set of GO modified binding layer MEAs were fabricated to optimize the GO loading in the modified binding layer and tested in DMFC at fixed temperature (70°C) and methanol concentration (1.0 M). Figure 4.9 shows the polarization curves and power density of GO MEA at 70°C and 1.0 M methanol concentration in DMFC for different GO wt% loading in modified binding layer. Sirhan AL-Batty Page 141PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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