Electrical Pulses To Determine Chemical Phase Response Curves

Article abstract of DOI:10.1021/j100029a021

We report several series of single perturbation experiments in the Belousov-Zhabotinsky (BZ) reaction which have been carried out by applying an electrical current to a platinum electrode in the continuous flow stirred tank reactor (6.4 mL).When a single short current pulse is applied at the maximum of a chemical oscillation (high Ce⁴⁺ concentration) or at the minimum (low Ce⁴⁺), the response is a small advance or a significant delay of the original phase of oscillation (negative or positive phase shift), respectively.Thus we obtain phase response curves as a function of electrical current strength and duration of the pulses.These results show that the redox reactions occuring at the platinum electrodes involve mainly the Ce³⁺/Ce⁴⁺ redox couple as supported by pulsed additions of known Ce⁴⁺ solutions.Numerical simulations are in good agreement with the experiments.