When a kinetic current
flows, the concentrations of the electroactive substance
B and its precursor C at very small distances from the electrode surface are influenced
both by mass transfer and by the finite rate of establishment of the chemical equilibrium
. As the distance from the electrode surface increases, the chemical equilibrium
is more and more nearly attained. The thickness of the reaction layer is the distance
from the electrode surface beyond which deviations from the chemical equilibrium
between C and B are taken to be negligibly small.
PAC, 1985, 57, 1491
(Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations
on page 1504
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