Boundary conditions for electrochemical interfaces

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Date
2017
Volume
164
Issue
11
Journal
Series Titel
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Publisher
Bristol : IOP Publishing
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Abstract

Consistent boundary conditions for electrochemical interfaces, which cover double layer charging, pseudo-capacitive effects and transfer reactions, are of high demand in electrochemistry and adjacent disciplines. Mathematical modeling and optimization of electrochemical systems is a strongly emerging approach to reduce cost and increase efficiency of super-capacitors, batteries, fuel cells, and electro-catalysis. However, many mathematical models which are used to describe such systems lack a real predictive value. Origin of this shortcoming is the usage of oversimplified boundary conditions. In this work we derive the boundary conditions for some general electrode-electrolyte interface based on non-equilibrium thermodynamics for volumes and surfaces. The resulting equations are widely applicable and cover also tangential transport. The general framework is then applied to a specific material model which allows the deduction of a current-voltage relation and thus a comparison to experimental data. Some simplified 1D examples show the range of applicability of the new approach.

Description
Keywords
Boundary conditions, Electrolytes, Fuel cells, Thermodynamics, Current-voltage relations, Double layer charging, Electrochemical interface, Electrochemical systems, Electrode-electrolyte interfaces, Modeling and optimization, Non equilibrium thermodynamics, Specific materials, Electrochemistry
Citation
Landstorfer, M. (2017). Boundary conditions for electrochemical interfaces. 164(11). https://doi.org//10.1149/2.0641711jes
License
CC BY-NC-ND 4.0 Unported