Oxidation of manganese(II) and reduction of manganese dioxide in sulphuric acid

被引：129
|
作者：
Nijjer, S [1 ]
Thonstad, J
Haarberg, GM
机构：
[1] Norwegian Univ Sci & Technol, Dept Mat Sci & Electrochem, N-7491 Trondheim, Norway
[2] SINTEF, Mat Technol, N-7034 Trondheim, Norway
来源：
ELECTROCHIMICA ACTA | 2000年 / 46卷 / 2-3期
关键词：
manganese dioxide; electrochemical oxidation; electrochemical reduction; cyclic voltammetry; acid solution;
D O I：
10.1016/S0013-4686(00)00597-1
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Oxidation of Mn2+ to MnO2 and reduction of MnO2 on Pt electrode in sulphuric acid was investigated by cyclic voltammetry as a function of the Mn2+ 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 MnO2 deposition while high acid concentrations inhibit the formation of MnO2. The mechanism of MnO2 deposition from Mn(II) is suggested to be an ECE sequence with the formation of an insulating intermediate (MnOOH). Small amounts of deposited MnO2 may be reduced electrochemically at the electrode surface. (C) 2000 Elsevier Science Ltd. All rights reserved.
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页码：395 / 399
页数：5
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