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methanol diffusion in the resistance layer and the high concentration has no longer a beneficial effect. In all experiments including a resistance layer done with supported catalyst, performance was decreased when the flow rate was increased from 1ccm to 5ccm. Only in one case this phenomena was not observed. It was with the 10wt% PTFE/10wt% NAFION resistance layer at 5mol/L (Figure 35). The explanation that can be given may be the following. At a high feed flow rate CO2 concentration becomes less important in the feed channel. Consequently, more carbon dioxide can diffuse through the resistance layer and this flux may reduce block methanol. When PTFE is added this is not true anymore since methanol diffuses through specific hydrophilic pores. Its diffusion can thus be increased by the flow rate. 0.600 0.500 0.400 0.300 0.200 0.100 0.000 0.00 50.00 100.00 150.00 200.00 i (mA/cm2) 250.00 300.00 10wt% PTFE / 1ccm 10wt% PTFE / 5ccm 10wt% PTFE + 10wt% NAFION / 1ccm 10wt% PTFE + 10wt% NAFION / 5ccm Figure 35: Effect of flow rate on the 10wt% PTFE and the 10wt% PTFE / 10wt% NAFION resistance layers at CMeOH = 5M (T = 80oC, Anode catalyst: 4mg/cm2 Pt/Ru black, Cathode: 4mg/cm2 Pt black, Cathode O2 flow rate = 75sccm, Thumidifier = 25oC) - 54 - U (V)PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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