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Results and discussion 6 RESULT CHAPTER 3- PROTON CONDUCTIVITY AND CROSSOVER 6.1 Introduction In this chapter the proton conductivity and the methanol permeability are test using standard MEA and modified binding layer MEAs. The effect of DMFC operating temperature and methanol concentration were shown in chapter four and chapter five respectively. The fuel cell showed different performance in terms of power density when the operating temperature increased from 40°C to 70°C and well as the methanol concentration from 1.0 M to 4.0 M which may attributed to the methanol crossover. In order to have carry on the investigation of the fuel cell behaviour, the proton conductivity and the methanol crossover was characterized in this chapter. The effect of the proton resistivity (inverse conductivity) was tested by using electrochemical impedance spectroscopy (EIS) technique. This technique relies on the frequency response analyser (FRA) unit which can determine the losses over the frequency range in the fuel cell. These losses are associated with the ohmic loss, anode/cathode loss, and mass transportation loss. After running several experiments and plotting the polarization curves (voltage vs current density) of standard and modified binding layer MEAs, it was found that the ohmic region lies between 0.35V and 0.45V on the polarization curve. Therefore, the voltage was fixed at 0.4V each time the impedance spectroscopy test was desired. 6.2 Proton conductivity of standard MEA in DMFC In this experiment, the standard MEA was prepared according to the steps listed in chapter 3 (page 95). Briefly, the anode feed molarity and flow rate were 1.0 M and 5.0 ml/min respectively. Figure 6.1 shows the Nyquist plot of standard MEA through a range of temperatures in DMFC. Sirhan AL-Batty Page 155PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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