Water Transport and Sorption in Nafion Membrane

Publication Type

Book Chapter

Abstract

Understanding the sorption behavior of perfluorinated ionomer membranes and its effects on the membrane's transport properties remains an important issue in the development of ion-conducting materials. In this chapter, the current state of understanding of water-transport mechanisms in Nafion membranes are explained by summarizing the relevant studies in the literature as well as including some of our experimental results. A large discrepancy in the reported diffusion coefficient exists due to a number of techniques measuring the mobility of water molecules at different time- and lengthscales. In addition, morphological changes in the membrane during water uptake provide insight into the additional mechanisms of water transport and incorporation in the membrane. By analyzing the time constants from different experiments it is possible to draw key conclusions that shed light onto the multiple swelling and transport processes in membranes.

Book Title

Polymers for Energy Storage and Delivery: Polyelectrolytes for Batteries and Fuel Cells

Volume

1096

Year of Publication

2012

ISBN

0097-6156

Refereed Designation

Refereed

Pagination

175 - 199
11

Publisher

American Chemical Society

City

Washington, DC

ISBN Number

0-8412-2631-8