## Nernst's diffusion layer

Also contains definition of: effective thickness of diffusion layer
https://doi.org/10.1351/goldbook.N04108
A fictitious layer corresponding to the dotted straight lines of the diagram which shows the concentration profile along the direction perpendicular to an electrode surface. The thickness $$\delta$$ of this layer is called the effective (or equivalent) thickness of the @D01725@. Its definition is apparent from the figure. It is the thickness which the @D01716@ layer would have if the concentration profile were a straight line coinciding with the tangent to the true concentration profile at the @I03082@, and that straight line were extended up to the point where the bulk concentration is reached. $$\delta$$ has a formal significance only. It is simply another way of writing the @M03754@ $$k_{\text{d}}$$ defined in terms of a @R05316@ instead of a conductivity.
N04108.png
Source:
PAC, 1981, 53, 1827. (Nomenclature for transport phenomena in electrolytic systems) on page 1837 [Terms] [Paper]