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Results and discussion 6.6 Summary As a summary of this chapter, the standard membrane electrode assembly was prepared several times to obtain a base line for comparison purpose. Standard MEA where tested at different fuel cell operating temperature and methanol concentrations to estimate the maximum power density. The maximum power density was 50 mW/cm2 obtained at 70°C and 1.0 M methanol concentration. Proton conductivity and methanol crossover were 0.128 S/cm and 90 mA/cm2 respectively. The proton conductivities and methanol crossover were evaluated by using electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) techniques for mordenite and graphene oxide modified binding layer MEA at different fuel cell operating temperature and methanol concentrations. A Mordenite modified binding layer MEA was employed to reduce the methanol crossover. The mordenite was functionalized with different silane coupling agent and used in modified binding layer MEA. MOR modified binding layer MEA was tested in the fuel cell at different fuel cell operating temperature and methanol concentration. The power density (80 mW/cm2) of the 0.5 wt% MOR modified binding layer MEA was 30% higher than the standard MEA and the methanol crossover was 15% less than standard MEA. However, the proton conductivity of the standard MEA was higher than F-MOR MEA. Functionalized mordenite (F-MOR) was sulfonated with HSO3 group (SULFO- MOR) to enhance the proton conductivity of the F-MOR and reduce the methanol crossover. The SULFO-MOR was tested in DMFC at different fuel cell operating temperature and methanol concentrations. The maximum power density of SULFO- MOR (92 mW/cm2) was from 40-45% higher than standard MEA and the methanol crossover was 6% less than standard MEA at 70°C and 1 M methanol concentration. The sulfonated mordenite did enhance the proton conductivity of F-MOR which reduces the proton conductivity from 0.065 Ω to 0.0609 Ω at 70°C and 1.0 M. However increasing the weight % of SULFO-MOR reduced the power density in DMFC. Graphene oxide was used in modified binding layer MEA to reduce methanol crossover in the fuel cell. The GO modified binding layer MEA with different wt% MEAs was tested in DMFC at different operating temperatures and methanol concentrations. The maximum power density (79 mA/cm2) was found when using 1.0 Sirhan AL-Batty Page 179PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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