Overall anodic polarization curves and partial polarization curves of oxygen evolution and formation of peroxosulphates (S 2 O 8 2- + SO 5 2- ) were measured potentiostatically on a smooth platinum anode in 1-13M-H 2 SO 4 at 25 °C at a small degree of conversion of SO 4 2- to S 2 O 8 2- ions. The known dependences of the current yield of peroxodisulphate on the total concentration of sulphuric acid at various current densities were substantiated. The found results were used to explain mechanism of formation of S 2 O 8 2- ions, according to which in contrast to previous explanations the possibility of simultaneous discharging of SO 4 2- and HSO 4 - ions is considered with partial rates depending on the reaction conditions. A mathematical formulation of this mechanism is in qualitative agreement with experiments, an evidence for the probability of the mechanism. A correlation of the current yield with the actual concentrations of SO 4 2- and HSO 4 - ions at various temperatures helps to further elucidate the negative influence of the temperature on the current yield.
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Balej et al. (1979) studied this question.