Modeling Concentration Profiles in Electrolytes by Solving 3-D Poisson-Nernst-Planck Equations via Finite Difference Method

Abstract

The Poisson-Nernst-Planck (PNP) equations are fundamental for modeling ion transport in electrochemical systems, capturing the intricate interplay of concentration gradients, electric fields, and ion fluxes essential for applications such as energy storage devices and other electrochemical devices. This study introduces a refined numerical framework employing the finite difference method to solve the 3-D PNP equations, enabling precise simulation of ion concentration distributions under realistic boundary conditions and applied electric fields. By rigorously addressing stability criteria and integrating advanced boundary constraints, including the Butler-Volmer equation for surface reactions, the model provides comprehensive insights into ion dynamics, particularly near electrode surfaces where electric field and reaction effects dominate. This framework significantly enhances traditional PNP modeling by accommodating varied boundary conditions, diffusion anisotropy, and complex electrochemical environments, offering a robust tool for investigating electrochemical processes and guiding the design of advanced electrochemical systems.

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