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and Ru sites. This should be taken in count during the catalyst preparation [7]. An optimized contact area between both catalysts is desired. Cathode catalyst: Pure platinum is almost universally used as a cathode catalyst. The catalytic powders used for DMFC are either metal black or supported catalyst on carbon particles at various loadings. Both of them are widely used. b. Catalyst structure The catalytic layer contains catalyst particles but also Nafion particles [6]. Nafion is added to the catalyst to help proton removal (Figure 6). A good continuity of the Nafion network is needed for effective transport of protons to the membrane. This reduces electric resistance of the catalytic layer. However, a too high Nafion loading would covers the catalyst particles and reduces the active area. Pt particle CH3OH Nafion + Water e- H+ Carbon particle Figure 6: Catalyst structure 6. Electrodes and MEA preparation Electrodes are prepared by applying a catalytic ink to an electrode backing used as a gas diffusion layer. - 23 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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