Etude du transport de l'eau dans les membranes Nafion des piles à combustible

Abstract : Proton exchange membrane fuel cells use a polymer membrane, which materialize the electrolyte. In order to obtain good performances, the water content of this polymer membrane must be under control. Water transport in the membrane is controlled by two flows : the electro-osmotic flow, induced by the proton flow, drags water molecules from anode to cathode, and back diffusion, which during normal operation enable water molecules to move from cathode to anode due to a water concentration gradient (water accumulation at cathode). The electro-osmotic flow, proportional to the cell's current, can be characterized by a coefficient. This work's aim consisted in experimental determination of electro-osmotic coefficient using the "?proton pump" mode with an instrumented fuel cell. A model has been built in order to obtain experimentally the electro-osmotic drag coefficient. It has been noticed that the electro-osmotic drag coefficient determination is strongly related to the electroosmotic flow evaluation accuracy. To improve the results, several experiments were performed in order to reduce the back diffusion flow over the electro-osmotic flow.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2013_MOROSINI_PIERRE.pdf
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https://hal.univ-lorraine.fr/hal-01860633
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Submitted on : Thursday, August 23, 2018 - 3:14:17 PM
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  • HAL Id : hal-01860633, version 1

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Pierre Morosini. Etude du transport de l'eau dans les membranes Nafion des piles à combustible. Génie des procédés. 2013. ⟨hal-01860633⟩

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