The Levich equation models the diffusion and solution flow conditions around a rotating disk electrode (RDE).
It is named after Veniamin Grigorievich Levich who first developed an RDE as a tool for electrochemical research.
The Levich equation is written as: where IL is the Levich current (A), n is the number of moles of electrons transferred in the half reaction (number), F is the Faraday constant (C/mol), A is the electrode area (cm2), D is the diffusion coefficient (see Fick's law of diffusion) (cm2/s), ω is the angular rotation rate of the electrode (rad/s), ν is the kinematic viscosity (cm2/s), C is the analyte concentration (mol/cm3).
The leading term 0.620 is from the calculation of the velocity profile near the surface of the electrode.
[2] Whereas the Levich equation suffices for many purposes, improved forms based on derivations utilising more terms in the velocity expression are available.