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Results and discussion It can be seen from Figure 4.8 (a) that the polarization curve 70°C was much higher than 60°C. The maximum current density was 700 mA/cm2 at 70°C whereas it drastically decreases to 250 mA/cm2 at 60°C due to the effect of temperature on the kinetics reaction taking place at the surface of the anode electrode. The maximum power density of the 0.5 wt% SULFO-MOR MEA was 92 mW/cm2 at 70°C. It seems that the improvement in the power density of DMFC was due to the presence of the sulfonic acid group on the mordenite surface which enhance the proton conductivity (which benefits from the presence of the H+ in the sulfonic group) across the membrane. This was an excellent improvement in the produced power density of DMFC. Comparing this result with standard MEA, the SULFO-MOR MEA improved the power density by 84%. However, at 60°C the power density was drastically decreased to 48 mW/cm2 which almost the same result was obtained when using F-MOR with 1.0 M at 60°C and the standard MEA with 2.0 M methanol at 70°C. 4.6 Effect of Varying Temperature on GO Modified Binding Layer MEA in DMFC Due to the unique properties of graphene oxide (GO) which were mentioned earlier in the literature review (chapter 3) in this thesis, GO was used as inorganic filler to modify the binding layer at the anode side of the membrane electrode assembly (MEA). GO was mixed with Nafion 117 solution at different wt% in order to reduce the methanol crossover in DMFC. The modified GO binding layer acts as a barrier layer between the catalyst layer and Nafion 117 at the anode side of DMFC to reduce the methanol crossover. Graphene oxide possess functional groups (epoxide, carbonyl (C=O), and hydroxyl) on the surface which can facilitate the transportation of ions across the membrane. In addition, GO favours the water molecules over the methanol in binary (alcohol/water) mixture (anode feed of DMFC) due to the hydrophilic properties. This makes GO suitable inorganic filler to enhance the fuel cell selectivity in this work. Sirhan AL-Batty Page 140PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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