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Results and discussion modified binding layer MEAs plus the standard MEA. Running the fuel cell at high temperature will lead to an increase in the partial pressure of the water vapour, thus, decreasing the oxygen partial pressure towards limiting conditions [172]. 4.7 Summary In this chapter, the effect of temperature was carried out by using Nafion 117 membrane sheet, anode catalyst loading 1.0 mg/cm2 platinum (Pt:Ru/C, 40:20:40), and cathode catalyst loading 1.0 mg/cm2 platinum (Pt/C, 60:40). Before studying the temperature influence using modified binding layer, the required amount of fabrication standard membrane electrode assembly (MEA) was illustrated and listed. In addition, the influences of the operating temperature through fuel cell temperature range from 40°C to 70°C were studied. Mordenite binding layer MEA: The effect of weight percentage of the functionalized mordenite as inorganic filler was studied in this chapter. As a result, it was found that optimum weight percentage of functionalized mordenite was 0.5 wt%. This was indicated by fuel cell maximum power density. Sulfonated mordenite binding layer MEA: The effect of weight percentage per loading of sulfonated mordenite with (MPTS) was shown in this chapter. 0.5wt% SULFO-MOR MEA showed higher power density than the 1.0 wt% SULFO-MEA. Moreover, the temperature effect was illustrate for the 0.5 wt% SULFO-MEA and showed a maximum power density of 92 mW/cm2 when operating the fuel cell at 70°C and 1.0 M methanol concentration. Graphene oxide binding layer MEA: five MEAs with different GO weight percentage per loading were illustrated in this chapter. As a result, the highest power density (79 mW/cm2) of the fuel cell was obtained when using 1.0 wt% of GO. This result was observed at 70°C and 1.0 M methanol concentration. Further characterization techniques such as proton conductivity and methanol crossover are needed to investigate the fuel cell behaviour with standard binding layer and modified binding layer. This will be illustrated in the next two following chapters. The next chapter will show the effect of methanol concentration in DMFC using modified binding layer MEAs. Sirhan AL-Batty Page 145PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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