Event № 620
advisor: Nir Gavish
Abstract: Concentrated electrolytes are an integral part of many electrochemical and biological systems, including ion channels, dye sensitized solar cells, fuel cells, batteries and super-capacitors. Spatiotemporal theoretical formulation for electrolytes goes back to 1890's where Poisson-Nernst-Planck (PNP) framework was originated. Extensive research efforts during the last century attempted to extend the PNP approach to concentrated electrolyte solutions. Nevertheless, recent experimental observations show qualitative features that are beyond the scope of all existing generalized PNP models. These phenomena include bulk self-assembly, multiple-time relaxation, and underscreening, which all impact the interfacial dynamics, and the transport in these systems.
In this talk, we shall present a thermodynamically consistent, unified framework for ternary media with an evolution mechanism based on a gradient flow approach . In contrast with generalized PNP models, the starting point of this work stems from models for ionic liquids with an explicit account of the solvent density. We show that the model captures the aforementioned phenomena together, and by using tools from bifurcation theory reveal their underlying mathematical origin.