Numerical and Mechanistic Analysis of Active Electroconvection Modulation in Polymer Electrolyte Solutions for Ion Transport and Energy Distribution
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER（2025）
Harbin Inst Technol
Abstract
Active modulations of charged interfaces are of importance to both electrochemical research and applications, where the overlimiting current response is linked to dendrite formation on battery electrodes and energy storage. However, overlimiting ion transport with surface topology and polymer electrolytes is poorly understood, especially in the presence of electroconvection phenomenon. In this paper, we perform a global analysis of the flow patterns, energy spectra, instantaneous and statistical morphology of electroconvection flow (ECF) with nonlinear Poisson-Nernst-Planck-Navier-Stokes (PNP-NS) schemes. Results show that the coupling of patterning surface and the elastic field gives rise to novel instabilities and current responses. Polymer macromolecules exhibit notable active modulation, dividing I-V (current-voltage) curves into several new branches characterized by energy sources or energy sinks at varied voltages. The instantaneous results reveal chaotic multiscale vortices and charge ribbons that separate and merge in a highly irregular manner. In addition, neutral polymer macromolecules act as flow stabilizers, and energy spectral densities (SEDs) suggest that the power law exponentially decays over narrower spatiotemporal scales than in Newtonian fluids. Owing to the distinction from purely electrokinetic instability-induced modes, the patterning dominant mode enhances ion mass transfer and cancels the limiting regime at a low voltage limit. Via controllable patterning modes and current branches, the electroconvection mechanism suggest new possibilities for manipulating ion transport and dendritic instabilities in electromembrane platform & energy storage systems.
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Key words
Ion-selective membrane,Charged surface,Polymer electrolyte solutions,Electroosmotic flow,Electrohydrodynamic,Viscoelastic fluid
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