Electrochemical impedance spectroscopy (EIS) of species that undergo reversible oxidation or reduction in solution was used for determination of rate constants of oxidation or reduction.
Chulkin, P., Data, P. Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation. J. Vis. Exp. (140), e56611, doi:10.3791/56611 (2018).