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Transport of methanol and water through Nafion membranes

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Barragán García, Vicenta María and Ruiz Bauzá, Carlos and García Villaluenga, Juan Pedro and Seoane Rodríguez, Benjamín (2004) Transport of methanol and water through Nafion membranes. Journal of Power Sources, 130 (01-Feb). pp. 22-29. ISSN 0378-7753

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2003.12.007


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Abstract

The mass flow originated when two methanol–water solutions of different methanol concentrations are separated by a membrane has been studied for two Nafion membranes. From the experimental results, the methanol and water permeabilities have been estimated. The experiments were carried out in absence and in presence of an electrolyte in the solutions. The obtained results show that, in the absence of the electrolyte, the methanol diffusion flow is higher than the osmotic water flow at all the methanol concentration gradient established, observing that the total mass flow takes place always from the concentrated toward the dilute solution. In contrast, in the presence of the electrolyte, an inversion of the total mass flow is observed at percentages of methanol higher than 40 wt.%. These experimental results could be important in relation to the problem of the methanol crossover in direct methanol fuel cells.


Item Type:Article
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© 2003 Elsevier B.V. Financial support from Ministerio de Ciencia y Tecnología of Spain under Project BFM2000-0625 is gratefully acknowledged.

Uncontrolled Keywords:Ion-Exchange Membranes, Electrolyte Fuel-Cell, Polymer Electrolytes, Proton, Performance, Diffusion.
Subjects:Sciences > Physics > Thermodynamics
ID Code:20969
Deposited On:30 Apr 2013 11:30
Last Modified:11 Mar 2016 17:59

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