Theoretical evidence of the difference in kinetics of water sorption and desorption in Nafion® membrane and experimental validation

Abstract : Water transport during sorption and desorption in Nafion® 117 samples is studied by means of dynamic model and experiments as a response of relative humidity step. The model takes into account a transfer resistance at the interface between the membrane and the surrounding medium, and considers that the water content of the membrane remains uniform at all times during sorption and desorption, which was confirmed using NMR imaging. Thus, its main hypothesis is that the membrane is in equilibrium with the humid gas located at the interface whose relative humidity is different than in the bulk. The calculated time-variations in the water content of a membrane sample (in acid form) during sorption and desorption show that desorption is faster than sorption due to the variations in the slope of the water uptake isotherm. The theoretical results and the experimental data show a good agreement which allows the determination of the mass transfer coefficient. The influence of diffusion and thermal effects are also discussed.
Type de document :
Article dans une revue
Journal of Power Sources, Elsevier, 2015, 300, pp.50 - 56. 〈10.1016/j.jpowsour.2015.09.053〉
Liste complète des métadonnées

https://hal.univ-lorraine.fr/hal-01431793
Contributeur : Lemta Ul <>
Soumis le : mercredi 11 janvier 2017 - 11:36:05
Dernière modification le : lundi 4 juin 2018 - 10:04:02

Identifiants

Collections

Citation

Sophie Didierjean, Jean-Christophe Perrin, Feina Xu, Gaël Maranzana, Mathieu Klein, et al.. Theoretical evidence of the difference in kinetics of water sorption and desorption in Nafion® membrane and experimental validation. Journal of Power Sources, Elsevier, 2015, 300, pp.50 - 56. 〈10.1016/j.jpowsour.2015.09.053〉. 〈hal-01431793〉

Partager

Métriques

Consultations de la notice

55