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
in the bulk solution (see diagram).
PAC, 1981, 53, 1827
(Nomenclature for transport phenomena in electrolytic systems)
on page 1837
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook