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 diffusion layer is arbitrary because the concentration approaches asymptotically the value c0 in the bulk solution (see diagram).
See also: Nernst's diffusion layer
Source:
PAC, 1981, 53, 1827. (Nomenclature for transport phenomena in electrolytic systems) on page 1837 [Terms] [Paper]
Citation: 'diffusion layer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.D01725 RIS BibTex EndNote
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