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voltages. The higher methanol concentration certainly promoted carbon dioxide formation because it disappeared when the feed flow rate was switched to 5ccm.When the resistance layer was located between the membrane and the cathode catalytic layer, performance was dramatically low (Figure 37). This location seems to seriously limit the transfer of protons to the cathode catalytic layer. The double layer anode with a resistance barrier is definitely more suitable than the double layer cathode. The concept using higher methanol concentration with a resistance layer has not been proven to be very effective in this study. However, the idea is still interesting, and may reduce the amount of water that needs to be carried with the methanol fuel cell. It has however showed that performance could be improved in high cell voltage range which is the most interesting for practical applications. 0.800 0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000 0.00 50.00 100.00 150.00 200.00 250.00 i (mA/cm2) 300.00 350.00 400.00 450.00 1M 2M 5M No resistance layer Figure 37: 10wt% PTFE / 10wt% NAFION resistance layer located between the membrane and the anode catalytic layer (T = 80oC, Anode catalyst: 4mg/cm2 Pt/Ru black, Cathode: 4mg/cm2 Pt black, Cathode O2 flow rate = 75sccm, Thumidifier = 25oC) - 56 - U (V)PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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