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用循环伏安法对粉体MnO_2(包括电解MnO_2和天然锰矿)电极在KOH水溶液中进行了研究,讨论并确定了实验条件。结果表明,电解MnO_2与天然锰矿由于结构不同,在碱性溶液中氧化还原的机理也不同;电解MnO_2→Mn_2O_3→Mn(OH)_2,而天然锰矿则一步还原成Mn(OH)_2。
The cyclic voltammetry was used to study the electrode of MnO_2 (including MnO_2 and MnO) in KOH aqueous solution. The experimental conditions were discussed and determined. The results show that the mechanism of redox reaction between MnO2 and MnO2 in alkaline solution is different due to their different structures; MnO2 → Mn2O3 → Mn (OH) 2, while MnO2 is reduced to Mn (OH) 2 in one step.