Abstract
Spectroscopic investigations of Mn 2+ electro-oxidation and MnO 2 electro-reduction in acidic media (0.5–2 M H 2SO 4) have been performed using optically transparent electrodes (OTE). Reticulated vitreous carbon (RVC) has been used as the electrode material. Our results show that in the first step of Mn 2+ ions electro-oxidation the unstable in aqueous media Mn 3+ ions are formed. In the next step Mn 3+ ions can hydrolyse to MnOOH and/or disproportionate to Mn 2+ and Mn 4+ ions. Contrary to the electro-oxidation of Mn 2+ to MnO 2, the electro-reduction of MnO 2 proceeds in two steps. The first step is strictly connected with electro-generation of MnOOH and the next with regeneration of Mn 2+ ions.
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