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Anode: The electrode backing was first sprayed with an ink made of 12mg of Pt/Ru black in 5ml of water and 5ml of ethanol. Then it was sprayed with 12mg of Pt black in 5ml of water and ethanol. Cathode: The electrode backing was first sprayed with an ink made of 12mg of Pt/Ru black in 5ml of water and 5ml of ethanol, then with 60mg of 20wt% Pt/C in 5ml of water and ethanol. 0.700 0.600 0.500 0.400 U (V) 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 Bilayer Pt black-Pt/Ru black at anode Pt/Ru at anode Figure 20: Bilayer Pt black-Pt/Ru black at anode (T = 80oC, Bilayer Anode, Cathode catalyst: 1mg/cm2 Pt on C, Anode flow rate = 1ccm, Cathode O2 flow rate = 75sccm, Thumidifier = 25oC) This bilayer anode gave a very poor performance (Figure 20). It was supposed to separate methanol decomposition (Pt/Ru) layer and adsorbed hydrogen oxidation (Pt layer). The amount of Pt/Ru was likely not sufficient to adsorb and decompose all the methanol molecules. Consequently the platinum layer was also poisoned and rendered ineffective. Thus basically, only half of the catalyst remained active. - 40 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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