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was placed on a note card to prevent the Nafion from contamination. The note card with the Nafion was placed on the top of the aluminum cylinder. Then a washer was placed on top of the Nafion. The washer was attracted to the magnets and the Nafion was secured by the washer being attracted by the magnets. Fuel Cell Testing Membrane Electrode Assembly (MEA) After the each Nafion membrane was pressed and measured, its performance was to be measured in a direct hydrogen fuel cell. The first step of this process was to prepare the MEA. The MEA consists of the electrolyte (Nafion membrane), catalyst, and the Gas Diffusion Layer (GDL) which also acts as the electrode. The electrolyte separates the reactions that are taking place inside the fuel cell. The catalyst is what causes the reaction to take place and in our case it is a platinum based catalyst. The GDL is a carbon cloth that acts as a current collector, or electrode as well as disperses the fuel throughout the cell. The catalyst and the GDL must be added to the Nafion membrane to complete the MEA. The First step in preparation of the MEA is making the catalyst. The catalyst is prepared using 7.5 mg of 20% Pt on Vulcan, which is a platinum based catalyst supported by carbon. The next step is to add 18 mg of 10% Nafion solution. The final step was to add 3 ml of 200 proof Methanol. The solution was mixed together and at this point the solution looks heterogeneous. Then the catalyst solution was allowed to sonicate for an hour, to make the solution homogeneous. After the hour of sonication the catalyst was applied to the Nafion membrane using a mask to cover the non-active area of the membrane. The catalyst was applied using an air gun to the membrane in many light coats. After the catalyst was applied to both sides of the membrane, the GDL was affixed to the catalyst. 16PDF Image | surface roughness of the Nafion membrane in a PEM fuel cell
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