## Wikipedia - Concentration polarization diffusion layer (concentration boundary layer)

https://doi.org/10.1351/goldbook.D01725
The region in the vicinity of an electrode where the concentrations are different from their value in the bulk solution. The definition of the thickness of the @D01716@ layer is arbitrary because the concentration approaches asymptotically the value $$c_{0}$$ in the bulk solution (see diagram).
N04108.png
See also:
Nernst's diffusion layer
Source:
PAC, 1981, 53, 1827. (Nomenclature for transport phenomena in electrolytic systems) on page 1837 [Terms] [Paper]