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3. Simulation a. Initialconditionsandparameters The code was used the model the cell current density for a cell working under the following conditions: T = 353K Q = 1ccm = 1.67.10-8 m3/s CCH3OH = 1000 mol/m3 PA = 101325 Pa PC = 101325 Pa Rate constants are unknown as well as double layer capacitance. They were guessed by trial and error. First, calculations were done with values provided by Sundmacher et al. These parameters are valid at 80oC. Consequently this model can only be used at this temperature or else new fitted parameters need to be found. V = 2.10-7 m3 T = 353K γ = 100 CA=4.105 F/m2 α1 = 0.5 αC = 0.5 R = 8.314 J/mol.K DMH+ = 5.4.10-9 m2/s kΦ = 1.13.10-19 m2 U0 = 1.21V Q = 1ccm = 1.67.10-8 m3/s AS = 5.10-4m2 Ct* = 2.2.10-5 mol/m2 CC = 8.105 F/ m2 α2 = 0.5 F = 96485 C M H+ = 1200 mol/m3 kP = 1.57.10-18 m2 μ = 3.353.10-4 kg/m.s κM = 17 Ω-1.m-1 Table 1: Parameter values employed in the model The following initial conditions have been used: CCH3OH = 1000 mol/m3 ΘRu-OH = 0 ηA = 0 V ΘPt3-COH = 0 ΘPt-COOH = 0 ηC = 0 V - 68 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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