Abstract
The concentrationsof soluble Mn(Ⅲ) species,during the reduction ofelectrolytic MnO_(2) (EMD)in alkaline solution,have been monitored in situ by UV-visible spectroscopy. The concentration of Mn(Ⅲ) ion in solution changes with discharge time.The first electron discharge process of EMD can be described by three different steps: 1) the reduction of Mn~(4+)ions on the surface of EMD particles and the structural defect regions within the EMD,2) the reduction of Mn~(4+)ions in ramsdellite,3)the reduction of Mn~(4+)ions in pyrolusite. During the second electron discharge of EMD, the soluble Mn(Ⅲ) is reduced to Mn(Ⅱ) , then Mn(OH)_(2)and Mn_(3)O_(4)are formed.
Keywords
EMD, UV-visible spectroscopy, Mn~(3+)ion, Reduction process
Publication Date
2004-05-28
Online Available Date
2004-05-28
Revised Date
2004-05-28
Received Date
2004-05-28
Recommended Citation
Li-cai ZHU, Zhong-zhi YUAN, Wei-shan LI.
Study on Reduction Process of Electrolyic Manganese Dioxide in Situ by Ultraviolet-visible Absorption Spectroscopy[J]. Journal of Electrochemistry,
2004
,
10(2): Article 19.
DOI: 10.61558/2993-074X.3322
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol10/iss2/19
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