Study on Reduction Process of Electrolyic Manganese Dioxide in Situ by Ultraviolet-visible Absorption Spectroscopy

Authors

Li-cai ZHU, Department of chemistry, South China Normal University, Guangzhou 510631, China
Zhong-zhi YUAN, Department of chemistry, South China Normal University, Guangzhou 510631, China
Wei-shan LI, Department of chemistry, South China Normal University, Guangzhou 510631, ChinaFollow

Corresponding Author

Wei-shan LI(liwsh@scnu.edu.cn)

Abstract

The concentrationsof soluble Mn(Ⅲ) species, during the reduction ofelectrolytic MnO₂ (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 Mn⁴⁺ ions on the surface of EMD particles and the structural defect regions within the EMD, 2) the reduction of Mn⁴⁺ ions in ramsdellite, 3)the reduction of Mn⁴⁺ ions in pyrolusite. During the second electron discharge of EMD, the soluble Mn(Ⅲ) is reduced to Mn(Ⅱ) , then Mn(OH)₂ and Mn₃O₄ are formed.

Keywords

EMD, UV-visible spectroscopy, Mn3+ ion, Reduction process

DOI Link

https://doi.org/10.61558/2993-074X.3322

Publication Date

2004-05-28

Online Available Date

2004-05-28

Revised Date

2004-02-21

Received Date

2004-01-08

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): 168-174.
DOI: 10.61558/2993-074X.3322
Available at: https://jelectrochem.xmu.edu.cn/journal/vol10/iss2/19