Experimental determination of electro-osmotic drag coefficient in Nafion membrane for fuel cells

The electro-osmotic drag coefficient in nafion 117 membrane is determined experimentally at different temperatures and water contents of the membrane. a pseudo-two-dimensional, steady-state diffusive model for water vapor transport through nafion membrane based on nonequilibrium membrane/gas diffusion layer interface is presented to determine the electro-osmotic drag coefficient and average water content. for the membrane in contact with water vapor, the electro-osmotic drag coefficient increases with increasing water content or water activity in the membrane. at the same water activity, temperature does not show influence on the electro-osmotic drag coefficient in the membrane in contact with water vapor. for the membrane in contact with liquid water on both sides, the electro-osmotic drag coefficient in the membrane increases linearly with temperature. high-frequency resistances of the cells using nafion 117 and 112 membranes are measured to evaluate the electro-osmotic drag coefficients obtained. the calculated membrane resistance based on a diffusive model agrees well with the experimental data under different operating conditions. (c) 2006 the electrochemical society.

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