mass-transfer-controlled electrolyte rate constant

In controlled-potential coulometry and related techniques, the empirically evaluated constant of proportionality defined by the equation

$s B = − 1 c B d c B d t$

where $c B$ is the bulk concentration of the substance B, and $d c B d t$ is the rate of change of that concentration, resulting from the consumption of B by reduction or oxidation at the working electrode.

Source:

PAC, 1985, 57, 1491 (Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations 1985)) on page 1501