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Results and discussion 4 RESULTS CHAPTER 1- EFFECT OF VARYING TEMPERATURE 40°C, 50°C, 60°C, AND 70°C 4.1 Introduction The aim of this thesis is improve the performance of DMFC (power density) by reducing the methanol crossover. To achieve this aim, inorganic fillers were mixed with Nafion solution to modify the binding layer of the anode electrode in the MEA. Modified binding layer MEAs were tested in DMFC at different operating temperature (result chapter 1) as well as methanol concentrations (result chapter 2) and characterized by a linear sweep voltammetry technique in order to evaluate the methanol crossovers and the proton conductivities (result chapter 3). This chapter will present the effect of direct methanol fuel cell operating temperature using standard MEA (MEA), functionalized mordenite binding layer MEA (MOR MEA), sulfonated mordenite binding layer (SULFO-MOR MEA), and graphene oxide binding layer (GO MEA) The standard MEA and modified binding layer MEAs were tested in the fuel cell and characterized by using electrochemical analysis linear sweep voltammetry (LSV) techniques to investigate the fuel cell performance at different temperature. All data were collected and plotted in terms of power densities vs current densities as a performance indicator. 4.2 Standard Membrane Electrode Assembly of DMFC Four MEA’s were made to be tested in the DMFC. All MEAs were prepared following the procedures listed in chapter 3 (page 95). Each MEA was placed in the DMFC under water circulation overnight for hydration before running the fuel cell. The following table shows the weights needed for fabricating standard MEA. Sirhan AL-Batty Page 127PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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