## Wikipedia - Concentration polarization (en) Wikipedia - Diffusion layer (en) 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 @[email protected] layer is arbitrary because the concentration approaches asymptotically the value $$c_{0}$$ in the bulk solution (see diagram).
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