Abstract
Oxidation of Mn 2+ to MnO 2 and reduction of MnO 2 on Pt electrode in sulphuric acid was investigated by cyclic voltammetry as a function of the Mn 2+ concentration, acid concentration, scan rate, temperature and convection. It was observed that oxidation of Mn(II) to Mn(IV) was mass transfer controlled. High temperature and stirring enhanced the oxidation rate of Mn(II) to Mn(IV). Decreasing acid concentration favours MnO 2 deposition while high acid concentrations inhibit the formation of MnO 2. The mechanism of MnO 2 deposition from Mn(II) is suggested to be an ECE sequence with the formation of an insulating intermediate (MnOOH). Small amounts of deposited MnO 2 may be reduced electrochemically at the electrode surface.
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