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possible to obtain higher current densities at low potential. However, it can easily be seen that with a Pt black cathode performance is found to be higher for a 1ccm flow rate at higher cell voltage and lower current densities. In this range less carbon dioxide is formed and thus more methanol diffuses to the anode catalytic layer. However, since less methanol is consumed crossover is promoted. 0.700 0.600 0.500 0.400 0.300 0.200 0.100 0.000 0.00 100.00 200.00 300.00 400.00 i (mA/cm2) 500.00 600.00 Pt black at cathode / 1ccm Pt on C at cathode / 1ccm Pt black at cathode / 5ccm Pt on C at cathode / 5ccm Figure 18: Effect of flow rate on a Pt/Ru black and Pt black MEA (Anode catalyst: 4mg/cm2 Pt/Ru black, Cathode O2 flow rate = 75sccm, T = 80oC, Thumidifier = 25oC) Figure 18 shows that for the supported platinum cathode, the flow rate had almost no influence. The thicker catalytic layer may have limited methanol crossover. e. Pt/Rucatalystonbothsidesofthemembrane As methanol crossover is an issue in DMFC and Pt/Ru is a promising catalyst for methanol oxidation it was also tested at the cathode side. - 38 - U (V)PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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