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Results and discussion 4M 0.5 0.4 0.3 0.2 0.1 70°C 60°C 50°C 40°C 25 20 15 10 5 00 0 50 100 150 200 250 Current Density (mA/cm2) Figure 5.2 DMFC performance for a standard MEA. A 4.0 M methanol feed and operating temperatures between 40°C and 70°C were used. (a) Polarization curves (b) Power Density curves. In the temperature experiment, the maximum power density was found at 70°C. Therefore, the fuel cell was tested first by using 1.0 M concentration as anode feed with methanol flow rate of 5.0 ml/min. The maximum power density obtained was ≈50 mW/cm2 for the standard MEA. At 2.0 M, the maximum power density of the fuel cell decreased to 47.6 mW/cm2. The last run on the methanol concentration experiment was made at 4.0 M. The maximum power density dropped to 21 mW/cm2. This may attributed to the mixed potential created at the cathode caused by the methanol crossover. Further experiments were carried out on lowering the methanol concentration below 1.0 M to investigate the optimum methanol concentration of standard MEA. At 0.5 M methanol concentration, the maximum power density was ~ 35.0 mW/cm2 (see appendix A). This may attributed to the limitation of fuel at the anode feed which led to insufficient reactant delivered to the anode electrode surface (loss of mass transport). It was found that the ideal power density was obtained at 1.0 M methanol and 70°C fuel cell temperature. The following section shows the effect of methanol concentration using modified mordenite binding layer MEA in DMFC. Sirhan AL-Batty Page 148 Potential (mV) Power Density (mW/cm2)PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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