Frumkin effect

Also contains definition of: 'true' rate constant
https://doi.org/10.1351/goldbook.F02538
In an
electrode reaction
, when reactants or
intermediates
are adsorbed, the
rate of reaction
may no longer be related to the
concentration
by a simple law. The
deviation
may be due to either entropic or energetic effects or both. The situation best understood is that where a reactant is non-specifically adsorbed in the outer Helmholtz plane (inner boundary of the
diffuse layer
). The effect of such
adsorption
on electrode kinetics is usually termed the Frumkin effect.
Rate constants
, transfer coefficients etc. corrected for this effect are frequently called 'true' rate constants etc. It would be preferable to describe them as 'corrected for the Frumkin effect', but in any case, if such a correction is carried out, the basis on which it is made should be clearly described.
Source:
PAC, 1980, 52, 233. (Electrode Reaction Orders, Transfer Coefficients and Rate Constants. Amplification of Definitions and Recommendations for Publication of Parameters) on page 239 [Terms] [Paper]