Zur Bestimmung kinetischer Parameter von heterogenen elektrochemischen Reaktionen an Mikrozylinderelektroden mit Hilfe der cyclischen Voltammetrie

Abstract

AbstractThe use of microcylindrical electrodes for the determination of the rate constant of the charge transfer from the peak separation is possible if the function between the peak separation and the rate constant can be approximated as depending on the radius. This dependence is investigated for a reversible, quasireversible and irreversible charge transfer in the present paper. As a result a function is developed which makes it possible to calculate the rate constant of the heterogeneous charge transfer if the dependence of the peak separation of the sweep rate and if α is approximately 0.5. It is shown that the last dependence of the peak separation has a minimum for microcylindrical electrodes with a radius of a few micrometer, if k < 0.06 cm/s. This permits the determination of an optimal sweep rate for analytical problems.