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3. Experiments and experimental conditions The DMFC was operated in a station designed for both hydrogen and methanol PEM fuel cell. The difference lies in the anode feeding system. For DMFC, a syringe pump (ISCO 1000D) replaces the hydrogen bottle and the humidifier (Figure 10). Humidifiers are used to maintain a certain humidity in the feed stream which keeps the water content of the membrane constant. Heating tapes prevent water condensation in the feeding pipes. Besides, there are two pressure controllers on the oxygen feeding stream. The first one which pressurizes the humidifier is used in addition to the heating tapes as a mean to control oxygen humidity. The second one located at the outlet of the cell control the cathode pressure. Either current or potential can be fixed with a controller and acquisition software (PCVE) is used to record both current and potential as a function of time. Computer acquisition software Pressure gauge Flow rate controller CH3OH Syringe pump Humidifier O2 Tank - + DMFC Pressure controllers Voltage/current controller Figure 10: Fuel Cell Stack Experiments consist in obtaining a polarization curve for the tested membrane at various experimental conditions. - 28 -PDF Image | Direct Methanol Fuel Cell (DMFC) Performance
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