chronocoulometry
Chronocoulometry is an electrochemical technique in which a potential step is applied to a working electrode and the resulting current is integrated over time to yield the total charge versus time. The method aims to quantify the amount of electroactive species in solution and to characterize diffusion-controlled transport by separating faradaic (charge transfer) from nonfaradaic (double-layer) contributions.
After the potential step drives a redox reaction, the current decays as diffusion governs the flux of
A common variant is double-potential-step chronocoulometry, which uses a second potential step to reverse the reaction