Direct Methanol Fuel Cell (DMFC) Performance

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Direct Methanol Fuel Cell (DMFC) Performance ( direct-methanol-fuel-cell-dmfc-performance )

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List of figures Figure 1: DMFC principle scheme ..............................................................17 Figure 2: Methanol crossover phenomenon ...................................................19 Figure 3: Internal short circuit created by crossover .........................................1.9 Figure 4: Crossover currant losses compared to total current density ......................20 Figure 5: CO2 bubbles formation and coalescence in the anode feed channel ...........21 Figure 6: Catalyst structure .....................................................................23 Figure 7: Flow patterns for bipolar plates .....................................................25 Figure 8: Pin Flow pattern .......................................................................25 Figure 9: Fuel Cell Stack ........................................................................26 Figure 10: Fuel Cell Stack ......................................................................28 Figure 11: Performance of commercial electrodes ...........................................30 Figure 12: Performance of hand-made electrodes ..........................................32 Figure 13: Current oscillations at fixed potential and anode feed flow rate of 1ccm ............................................................................... 33 Figure 14: Current oscillations at fixed potential and anode feed flow rate of 5ccm ............................................................................... 34 Figure 15: Effect of flow rate on cell performance ..........................................34 Figure 16: Performance of supported catalysts .............................................. 35 Figure 17. a: Current oscillations at fixed potential for an anode flow rate of 1ccm ..............................................................................36 Figure 17. b: Current oscillations at fixed potential for an anode flow rate of 5ccm ............................................................................. 37 Figure 18: Effect of flow rate on a Pt/Ru black and Pt black MEA ....................... 38 Figure 19: Effect of temperature on an MEA made with Pt/Ru black on anode and cathode ...............................................................39 Figure 20: Bilayer Pt black-Pt/Ru black at anode ........................................... 40 Figure 21: Bilayer Pt/Ru black-Pt on C at anode ............................................ 41 Figure 22: Effect of temperature and flow rate ...............................................42 Figure 23: Effect of cathode humidification ..................................................43 -5-

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