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Method and characterisation Mixture was sonicated and stirred for 2hr at interval of 2 hr forming a homogeneous solution. Functionalized mordenite (MPTS) modified binding layer was sprayed on the anode electrode after the catalyst layer. Three layers of modified binding layer were coated as a barrier layer on the electrode surface (anode side); each layer is followed by drying at 100°C in oven for 10 minutes. The anode electrode (with the fabricated barrier layer by F-MOR) and cathode were sandwiched and placed in DMFC for testing. 3.5.5.1 Mordenite particle size In this study, zeolite (mordenite type) was used as inorganic filler for fabricating a modified binding layer MEA to reduce the methanol crossover in direct methanol fuel cell. Mordenite particle size was examined by using of particle size distribution analysis (CEMIST Masteriser and Zetasizer systems) in aqueous dispersions before and after the ball-milling of mordenite. The particle size test was made by sonicating 0.5 grams of mordenite for five minutes in ethanol solution. The average particle size obtained was ~ 0.8 μm. The mordenite which has been used in this experiment was wet ball-milled (160 rpm) overnight. The mordenite ratio to grinding media ratio was 1:2 in a volume basis. The total ball-milling volume was 250 ml. Mordenite then was centrifuged, washed and filtered with water and ethanol several times after the wet ball-milling process was done. Mordenite was kept in drying cabinet at 40°C for 24hr and was ready to be used for the protonation purposes. A few grams of the sample were taken for particle size distribution analysis to measuretheparticlesizeoftheball-millingprocess. Figure3.31showsacomparison before and after ball-milling process. Sirhan AL-Batty Page 111PDF Image | Membrane Electrode Assembly Modification by Zeolite and Graphene Oxide
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