Definition - What does Nernst Layer mean?
A Nernst layer refers to a fictitious scientific area on a concentration profile graph of an electrode. It represents the hypothetical thickness of the diffusion layer that is present on an electrode immersed in an electrolytic solution.
The Nernst layer may also be known the Nernst diffusion layer.
Corrosionpedia explains Nernst Layer
The Nernst layer is used in scientific theory to describe the diffusion (or double) layer of an active electrode. A double layer is the interface between an electrode or a suspended particle and an electrolyte created by charge-charge interaction (charge separation) leading to an alignment of oppositely charged ions at the surface of the electrode or particle. It is related to electrical double layers such as the Helmholtz double layer (HDL) and works on the principle of the Nernst diffusion layer.