(Invited) Macroscopic Models of Ion-Nafion Interations: Influence of Counter Ion Density on Network Morphology

Monday, 2 October 2017: 14:00
National Harbor 4 (Gaylord National Resort and Convention Center)


We develop a continuum energy formulation for an ionomer membrane with a multicomponent counter-ion electrolye, such as occur in Vanadium redox flow batteries. At low hydration levels the high electrolyte molarity induces strong interactions between tethered and counter ions, as well as competition for solvation among ionic groups. Through-membrane variation in composition of the counter-ion density can lead to changes in the ionomer membrane network morphology, which in turn couple to the counter ion mobility. We consider a gradient flow model which couples electrolyte motion, solvation, ionomer network morphology and present both analytical and numerical simulations.