Chronoamperometry of prussian blue films on ITO electrodes: ohmic drop andfilm thickness effect

The chronoamperograms associated with the reduction of prussian blue films deposited onto indium tin oxide (ITO) electrodes to the Everitt's salt form , are influenced by the ohmic drop effect. These chronoamperometric curves have been simulated by means of a numerical finite difference model which i s able to explain their shape and their dependence on the thickness of the film and on the uncompensated resistance. An analytical expression which de scribes the dependence of current against time at initial times considering the ohmic drop effect has also been proved when applied to these chronoamp erometric curves at short times. (C) 1999 Elsevier Science Ltd. All rights reserved.