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The GDL was applied using two different methods. For the first trial the GDL was hot pressed using 2000 lbs of force and 270 °F. The hot pressing is used to ensure good contact is made between the catalyst and GDL. The second trial the hot pressing of the GDL was eliminated instead the Nafion membrane that had been coated with the catalyst was placed in 70 °C oven for an hour to remove the natural solvents from the Nafion and catalyst. The GDL was just placed on either side of the MEA when the stack was being assembled. Fuel Cell Tests After the MEA was completed it was run in a fuel cell test stack using hydrogen as a fuel. The MEA was conditioned over night. Then the fuel cell was tested at different applied voltages and the current output of the cell was recorded. Results Surface Texture Transfer The Olympus LEXT3100 confocal microscope was used to measure the surfaces of the Nafion membrane and the molds used to modify the Nafion membranes. The measurement of the Nafion membrane modified with the T3 mold visually had a significantly lower amount of surface texture than the T3 mold. The images of the mold and the Nafion membrane generated by the Olympus LEXT 3100 from the measurement are shown in Fig. 1. 17PDF Image | surface roughness of the Nafion membrane in a PEM fuel cell
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