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Results and discussion 5 RESULT CHAPTER 2-EFFECT OF VARYING METHANOL CONCENTRATION 1.0 M, 2.0 M, AND 4.0 M 5.1 Introduction The aim of this thesis is enhance the DMFC performance by reducing the methanol crossover through the modification of the anode binding layer using inorganic filler such as mordenite and graphene oxide. The pervious study (chapter 4) was made by varying the fuel cell temperature and fixing the concentration at 1.0 M methanol as an anode feed. To carry on the investigation of the modified binding layers, the influence of methanol concentration on modified binding layers has been introduced. Therefore, the following chapter shows the fuel cell performance at different methanol concentrations. This involves standard MEA, mordenite binding layer MEA, sulfonated mordenite binding layer MEA and graphene oxide binding layer MEA. Since the maximum power density of DMFC was obtained at 70°C, all four MEAs were tested by fixing the fuel cell temperature (at 70°C) and varying the methanol concentration. The methanol concentrations used in this study were 1.0 M, 2.0 M, and 4.0 M. 5.2 Effect of Varying Methanol Concentration on Standard MEA in DMFC The methanol concentrations were set to be 1.0 M, 2.0 M, and 4.0 M. Each run followed the same activation (fuel cell conditioning) procedures which were mention in section4.3. Thefuelcelltemperaturewasvariedduringtheconcentrationexperiments tostudytheeffectoftemperatureoneachmethanolfeedmolarity. Figure5.1 shows the polarization curves as well as the power density of 2.0 M through a range of fuel cell operating temperature. Sirhan AL-Batty Page 146PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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