kronopotentiogram

A kronopotentiogram is a type of electrochemical measurement that records the potential of an electrode as a function of time while a constant current is applied. This technique is often used to study the diffusion and reaction kinetics of electroactive species in solution. When a constant current is passed through an electrochemical cell, the potential of the working electrode will change over time. Initially, the potential may be relatively stable as the electroactive species near the electrode surface is consumed. As the concentration of the electroactive species at the electrode surface decreases, the potential will begin to increase or decrease, depending on whether the reaction is oxidative or reductive. This change in potential can provide information about the diffusion coefficient of the species, as well as the rate of any associated chemical reactions. The shape of the kronopotentiogram, particularly the transition time where the potential changes rapidly, is characteristic of the electrochemical system being studied. Analyzing these transition times and the overall potential-time profile allows researchers to determine various electrochemical parameters. It is a valuable tool in electrochemistry for characterizing the behavior of redox-active compounds and understanding electrode processes.