CONTROLLING ELECTROCHEMICAL CHAOS IN THE COPPER-PHOSPHORIC ACID SYSTEM

Model calculations indicate that chaotic current oscillations during a nodic electrodissolution of copper into phosphoric acid may be control led by applying a simple map-based algorithm. In the experiments, the unstable period-one and period-two orbits embedded in the chaotic attr actor have been stabilized by small perturbations of the anodic potent ial. We present the results of an experimental test for a power law re lating the average chaotic transient time to the size of maximum pertu rbation allowed during control. The reported experimental results are in good agreement with the theoretical predictions by Ott, Grebogi, an d Yorke.