现场紫外-可见吸收光谱研究电解二氧化锰的还原过程

电化学（中英文） ›› 2004, Vol. 10 ›› Issue (2): 168-174.

现场紫外-可见吸收光谱研究电解二氧化锰的还原过程

朱立才,袁中直,李伟善

华南师范大学化学系,华南师范大学化学系,华南师范大学化学系广东广州510631 ,广东广州510631 ,广东广州510631

收稿日期:2004-05-28 修回日期:2004-05-28 出版日期:2004-05-28 发布日期:2004-05-28

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

ZHU Li-cai,YUAN Zhong-zhi,LI Wei-shan~*

(Department of chemistry,South China Normal University, Guangzhou 510631,China

Received:2004-05-28 Revised:2004-05-28 Published:2004-05-28 Online:2004-05-28

摘要/Abstract

摘要： 　应用现场紫外可见吸收光谱研究碱性溶液中电解MnO2(EMD)放电机理.结果表明,对EMD电极的放电还原,包括两个单电子过程,其第1电子还原又分为3步:①还原MnO2颗粒表面和阳离子空位附近的Mn4+离子,②还原斜方锰矿中的Mn4+离子,③还原软锰矿中的Mn4+离子.第2电子还原是将溶解的Mn3+还原成Mn2+,进一步转化成Mn(OH)2和Mn3O4.

关键词: 电解二氧化锰, 紫外可见光吸收谱, Mn3+离子, 还原过程

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.

Key words: EMD, UV-visible spectroscopy, Mn~(3+)ion, Reduction process

中图分类号:

TM912.1

朱立才,袁中直,李伟善. 现场紫外-可见吸收光谱研究电解二氧化锰的还原过程[J]. 电化学（中英文）, 2004, 10(2): 168-174.

ZHU Li-cai,YUAN Zhong-zhi,LI Wei-shan~* . Study on Reduction Process of Electrolyic Manganese Dioxide in Situ by Ultraviolet-visible Absorption Spectroscopy[J]. Journal of Electrochemistry, 2004, 10(2): 168-174.

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https://electrochem.xmu.edu.cn/CN/Y2004/V10/I2/168

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