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Thus, 5, 10 and 20wt% PTFE electrodes were tested. For cathode side, only the 5wt% electrode was investigated. Nafion loading remained 10wt% for each electrode. Addition of PTFE does not have a great effect on the cell performance (Figure 27). Oxygen diffusion to the catalytic layer seems not to be a key issue for pure oxygen use on cathode. Nordlund et al [16] also suggested that adding PTFE to the anode may make the morphology more favorable for carbon dioxide to evolve as a gas by creating the necessary pores. Thus PTFE may help carbon dioxide diffusion through the anode catalytic layer. The improved removal should also provide a better methanol supply to the catalyst. 0.700 0.600 0.500 0.400 U (V) 0.300 0.200 0.100 0.000 5wt% Nafion at anode / 1ccm 5wt% Nafion at anode / 5ccm 10wt% Nafion at anode / 1ccm 10wt% Nafion at anode / 5ccm 20wt% Nafion at anode / 1ccm 20wt% Nafion at anode / 5ccm 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 i (mA/cm2) 400.00 450.00 Figure 29: Effect of various PTFE content at the Anode (T=80oC) (Anode catalyst: 4mg/cm2 Pt/Ru black, Cathode: 1mg/cm2 Pt/C, Cathode O2 flow rate = 75sccm, Thumidifier = 25oC) For 5% PTFE at 60oC, flow rate had no influence on performance except at very low cell voltage. So we could assume that methanol transfer to the anode was no longer a problem (Figure 28). However, better performance was obtained without PTFE but at a feed flow rate of 5ccm. At 80oC, performance is slightly higher using 5% PTFE and the - 48 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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