ANODIC OXIDATION MECHANISM OF HYPOCHLORITE ION ON PLATINUM ELECTRODE IN ALKALINE SOLUTION

The anodic oxidation of hypochlorite ion (ClO−) or chlorite ion on platinum (Pt) electrode was carried out at 30°C in solution. A plateau was observed on the anodic polarization curve of ClO− in the potential range of 0.90–1.20V and, in the case of , a plateau was observed in the potential range of 1.10–1.50V. When alkaline solutions with various concentration ratios of to were electrolyzed at 1.20V over 50h, the Raman intensity ratio of to ClO− in the anolyte was found to be constant at a value of ca. 0.12 in every case. From the calibration curves obtained in system, the concentration ratio of to ClO− was estimated to be ca. 0.08, which is in good agreement with the theoretical value according to a first‐order consecutive reaction. Based on these results, it is suggested that the mechanism of the anodic oxidation of ClO− is .