A rotating disk electrode study of the catalytic wave produced by the reduction of iodine in the presence of iodate

The catalytic reduction of iodate at a rotating platinum disk electrode has been employed to study the kinetics of the reaction between iodate and iodide. In acid perchlorate media, trace iodine was added to the iodate solution, and the electroreduction of iodine to iodide initiated the catalytic reduction of iodate. A closed-form solution for the catalytic current is obtained by using the method of moments. In acid chloride media, iodine monochloride was added to initiate the catalytic process. In perchlorate media, dC_I2/dt = (4 × 10⁵)C_H+²C_IO3C_I- + (5.1 × 10⁹)C_H+²C_IQ3-C_I- ², while in chloride media dC_I2/dt = (1.7 × 10⁹)C_H+³C_IO3-C_I-C _Cl-.