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首页> 外文期刊>Russian journal of electrochemistry >Kinetics of Anodic Formation and Cathodic Reduction of MnO2 in the Sulfate Electrolyte Solutions
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Kinetics of Anodic Formation and Cathodic Reduction of MnO2 in the Sulfate Electrolyte Solutions

机译：硫酸盐溶液中MnO2的阳极形成动力学和阴极还原

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摘要

The anodic formation of manganese dioxide is studied voltammetrically in a wide range of potential scan rate (V = 0.001-8 V/s). Using the diagnostic criteria of cronovoltammetric method, based on the original experimental data, the mechanism of electrooxidation of manganese ions in the acidic medium with subsequent reaction of disproportionation of the product of irreversible electrode reaction and hydrolysis yielding manganese dioxide is proposed. The kinetics of cathodic reduction of electrolytic manganese dioxide in the 0.5 M Na2SO4 solution is studied under the steady-state and non-steady-state potentiodynamic polarization conditions. From the experimental data, it is found that, in the acidic medium (pH 1-3), the mechanism of the electrode process changes depending on the cathodic potential scan rate: at the scan rate V < 0.5 V/s, MnOOH forms via one-electron transition leading, in its turn, to the partial deactivation of electrode surface with subsequent disproportionation of manganite. At the relatively high potential scan rates, manganite has no time to form, and the two-stage reduction via one-electron transitions at each stage is well pronounced. The parameters of the electrode processes are calculated.
机译：在大范围的电位扫描速率（V = 0.001-8 V / s）中对伏安法研究了二氧化锰的阳极形成。根据原始伏安法的诊断标准，在原始实验数据的基础上，提出了酸性介质中锰离子的电氧化机理，以及不可逆电极反应和水解生成二氧化锰产物随后发生歧化反应的机理。研究了在稳态和非稳态电势极化条件下，0.5 M Na2SO4溶液中电解二氧化锰的阴极还原动力学。从实验数据发现，在酸性介质（pH 1-3）中，电极过程的机理根据阴极电势扫描速率而变化：在扫描速率V <0.5 V / s时，MnOOH通过单电子跃迁又导致电极表面的部分失活以及随后的锰矿歧化。在相对较高的电位扫描速率下，锰矿没有形成时间，并且在每个阶段通过单电子跃迁进行的两阶段还原非常明显。计算电极工艺的参数。

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