MICROELECTRODES WITH LEAK OF SOLUTION

Charging current observed in cyclic voltammetry with microelectrodes a t fast sweep rate was investigated. Cyclic voltammograms were often di storted owing to the charging current into the gap between the microel ectrode and surrounding insulator. Based on a.transmission line model for the equivalent circuits of the cell, an expression of charging cur rent was derived. Validity of the model was supported by the agreement between the computed current-potential curves and the experimental da ta at various sweep rates. It is found that a slight leak can signific antly affect the current response owing to its high circumference-to-a rea ratio. if the increase in charging current due to the presence of leak is not so large, such an electrode with small leakage can be used for the kinetic analysis as far as we take the leakage into considera tion.