Preferred Label : Nernst's diffusion layer;
IUPAC definition : 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 δ of this layer is called the effective (or equivalent) thickness
of the diffusion layer. Its definition is apparent from the figure. It is the thickness
which the diffusion layer would have if the concentration profile were a straight
line coinciding with the tangent to the true concentration profile at the interface,
and that straight line were extended up to the point where the bulk concentration
is reached. δ has a formal significance only. It is simply another way of writing
the mass transfer coefficient kd defined in terms of a resistivity instead of a conductivity.;
Origin ID : N04108;
See also
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 δ of this layer is called the effective (or equivalent) thickness
of the diffusion layer. Its definition is apparent from the figure. It is the thickness
which the diffusion layer would have if the concentration profile were a straight
line coinciding with the tangent to the true concentration profile at the interface,
and that straight line were extended up to the point where the bulk concentration
is reached. δ has a formal significance only. It is simply another way of writing
the mass transfer coefficient kd defined in terms of a resistivity instead of a conductivity.
