Limiting Current Density

Definition - What does Limiting Current Density mean?

Limiting current density refers to an electrochemical occurrence when an electric current passes through an ion exchange membrane, reducing salt concentration polarization. The limiting current density is the maximum current density required to achieve a desired electrode reaction prior to the simultaneous discharge of extraneous ions.

Corrosionpedia explains Limiting Current Density

The limiting current density of a liquid solution is dependent on the electrolyte concentration and solution velocity. Concentration polarization occurs in the boundary layer of a substrate surface of an ion exchange membrane.

The limiting current density is influenced by the following variables:

  • The solution flow in a desalting cell
  • The path of ionic transportation in the boundary layer
  • The distribution of solution flow in desalting cells

Limiting current density can be measured by the following factors, among others:

  • Faraday constant
  • Diffusion coefficient
  • Current density
  • Ratio of current density to diffusion limited current density (DLCD)
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