A TECHNIQUE FOR SERIES RESISTANCE MEASUREMENT AND OHMIC DROP CORRECTION UNDER POTENTIOSTATIC CONTROL

A technique for IR correction in potential-controlled experiments with simultaneous recording of the uncompensated resistance R is described . Sampled high frequency measurements of R are repeatedly performed du ring the potential control using a low amplitude sine wave perturbatio n Voltage without disconnecting the working electrode from the potenti ostat. The values obtained for R and the independently measured cell c urrent are used by the software controlling the potentiostat to correc t the applied electrode potential. An application to cyclic voltammetr ic measurements using a silver electrode in an alkaline electrolyte is demonstrated. The observed changes in the measured resistance R are a nalysed and related to the voltage dependence of the current to yield information about the electrochemistry and the validity of the IR comp ensation.