Direct Methanol Fuel Cell (DMFC) Performance

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Direct Methanol Fuel Cell (DMFC) Performance ( direct-methanol-fuel-cell-dmfc-performance )

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Thus it was tested for 112 Nafion membrane, PC = 0atm (rel.), CMeOH = 1M: Figure 55: Theoretical polarization curve for a 112 Nafion membrane at 80oC with Fanode = 5ccm, CCH3OH = 1M and PC = 0atm (rel.) For a 112 Nafion membrane, theory and experiment fit well above 0.3V (Figure 55). Again this may be due to CO2 formation. Such a difference at low cell voltage can be completely due to the low methanol diffusion due to CO2 evolution. In addition we were not accounted for fouling of the cathode by the methanol that is crossing over to the cathode. The original code was modified to account for fouling of the cathode. Differential equations (a) to (e) appeared two times in the system, one time to describe methanol oxidation at the anode and a second time to describe methanol oxidation at the cathode side. It had nevertheless no effect on the final results. This may be due to an underestimation of methanol crossover by the model. Another reason may be that - 80 -

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