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Results and discussion 70°C 1M 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2M 4M 00 0 100 200 300 400 500 600 Current Density (mA/cm2) 90 80 70 60 50 40 30 20 10 Figure 5.6 Polarization curve and power density of 1.0 wt% GO modified binding layer MEA in DMFC using 1.0 M, 2.0 M and 4.0 M methanol concentration and 70°C operating temperature In Figure 5.6 the effect of methanol concentration on 1.0 wt% GO MEA was carried out at 70°C fuel cell operating temperature. The maximum power density obtained at 1.0 M was ~ 79.0 mW/cm2. The power density at 2.0 M and 4.0 M was 61 and 38.5 respectively. Comparing these results with standard MEA, the 1.0 wt% GO shows better fuel cell performance in terms of power density. However, further investigations need to be done in order to explain the fuel cell behaviours. Influence of concentration The effect of methanol concentration on the fuel cell has been explained in background section (page 43). Studying the methanol concentration can help in reducing the total weight of DMFC by reducing the methanol volume tank. The higher the methanol concentration the smaller the volume tank is required. In recent years, running the DMFC using high concentration methanol (above 2.0 M), including pure methanol, have attracted more attention [174]. However, this considers a quite challenging due to methanol crossover which is the major drawback of the Nafion membrane. Obviously, lowering the methanol concentration at the anode electrode will lower it in the electrolyte, and hence at the cathode electrode. When methanol oxidation Sirhan AL-Batty Page 152 Ceill Voltage (v) Power Density (mW/cm2)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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