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The kinetics of oxidation of hypochlorite ions on a platinum electrode in chloride free solutions, 1 M in KF, at pH 12, have been studied. Double-ring rotating electrode has been used to record both the steady-state polarisation curves (inner ring) and diffusion-limiting currents of reduction of reaction products and intermediates (outer ring). The results indicate that the basic oxidation step is that of removal of a single electron from OCl− ion with the formation of OCl radical. The latter undergoes further chemical reactions in the bulk phase until the overall reaction of chlorate formation defined by Foerster is accomplished.