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CA=4.105 F/m2 K1 = 1 mol/m2.s K3 = 1 mol/m2.s k2 = 1 mol/m2.s k4 = 1 mol/m2.s CC = 8.105 F/ m2 K2 = 1.10-5. mol/m2.s k1 = 4.10-9 mol/m2.s k3 = 1.10-2 mol/m2.s kC = 1.10-2 mol/m2.s Table 2: Fitted parameter values b. Search of fitting parameters At a given potential, the calculated current density didn’t fit experimental data. Thus, the code was modified to draw the polarization curve and find the fitted constants. In order to do that, the current density was calculated for fixed potential between 0.1V and 0.5V with a step of 0.1V. The MEA used to do the comparison with experimental was made with 4mg/cm2 Pt/Ru and 4mg/cm2 Pt black electrodes and a 117 Nafion membrane. It was tested at 80oC and an anode feed flow rate of 5ccm. As the model does not take count on the formation of CO2, results should be more meaningful at high flow rate. It had no effect on the model in which calculations are done for a feed flow rate of 1ccm. It was indeed shown that small changes in feed flow rate do not affect the results. Besides, current density was taken at t = 100s as dynamic evolution showed that steady state is reached after about 60s (Figure 45, 46, 47). The fitted rate constants are: k1 = 6.10-12 mol/m2.s k2 = 1.10-2 mol/m2.s k3 = 1.6.10-2 mol/m2.s k4 = 4.10-2 mol/m2.s - 69 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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