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difference becomes significant at low cell voltage for a feed flow rate of 5ccm (Figure 28). Kinetics is improved by temperature. Consequently, at 80oC, more methanol is needed at the catalytic layer. PTFE and higher flow rate both have a beneficial effect. For the anode, performances decreased with the PTFE loading (figure 29). The high concentration of hydrophobic pores apparently blocked methanol diffusion to the anode catalytic layer. 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 1ccm / 1M 1ccm / 5M 5ccm / 1M 5ccm / 5M Figure 30: Effect of methanol concentration on a 20wt% PTFE at the Anode (T=80oC) (Anode catalyst: 4mg/cm2 Pt/Ru black, Cathode: 1mg/cm2 Pt/C, Cathode O2 flow rate = 75sccm, Thumidifier = 25oC) Based on the idea that PTFE reduces methanol diffusion to the catalytic layer, a 20wt% PTFE anode was tested with both a 1 and 5 molar solution (figure 30). The 5 mol/L solution was able to compensate for the low methanol diffusion and give better results. However performance is still lower than that observed without PTFE. This result is interesting as it shows that good performance can be kept even when the cell is fed with a high methanol concentration with the use of PTFE treated anode. - 49 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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