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Diffuse Double Layer With Charge Transfer

Application ID: 13525


In the diffuse double layer and within the first few nanometers of an electrode surface, the assumption of electroneutrality is not valid due to charge separation. Typically, the diffuse double layer may be of interest when modeling very thin layers of electrolyte including those in electrochemical capacitors and microelectrodes. This example shows how to couple the Nernst-Planck equations to Poisson’s equation, in order to consider this deviation from electroneutrality. A Stern layer with constant capacity is used to derive surface charge boundary conditions for Poisson’s equation. This 1D model reproduces the results published in literature.

Questo modello è stato realizzato con:

Electrochemistry Module

The combination of COMSOL® products required to model your application depends on the physics interfaces that define it. Particular physics interfaces may be common to several products (see the Specification Chart for more details). To determine the right combination of products for your project, you should evaluate all of your needs in light of each product\'s capabilities, consultation with the COMSOL Sales and Support teams, and the use of an evaluation license.