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Abstract Polymer Electrolyte Membrane/Proton Exchange Membrane (PEM) fuel cells operate utilizing electrochemical reactions which take place on a surface. This work sets out to test the hypothesis, that increasing area due to greater roughness will increase the power output density. Nafion membranes were molded using heated aluminum dies, which were ground and machined to produce a variety of surface textures (thereby imprinting the Nafion membrane with the different textures from the molds). The textures of the each Nafion membrane were measured using an Olympus LEXT 3100 scanning laser microscope. Area-scale analysis and scale-based correlation testing were used to determine the extent of correlations between the textures and the power density of the fuel cell and the scale ranges over which correlations exist. Introduction Objective This research identifies the challenges involved with modifying, discriminating, measuring, and calculating the effective area of the Nafion electrode membrane a critical component of the Proton Exchange Membrane or Polymer Electrolyte Membrane (PEM) fuel cell. As reported by Larminie and Dicks, the two fundamental problems with fuel cells other than costs are hydrogen not being a readily available fuel source and low power and current outputs of fuel cells. One of the main factors of the low current output is the electrode area (Larminie & Dicks, 2003). As the area of the electrode increases the current and power output increases. Since the reaction that drives the fuel cell occurs over a surface area, this research is setting out to analyze the hypothesis that by modifying the surface texture, the surface area of the 6PDF Image | surface roughness of the Nafion membrane in a PEM fuel cell
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