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研究论文

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
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  • 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

  网络出版日期: 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~
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  • (Department of chemistry,South China Normal University, Guangzhou 510631,China

Received date: 2004-05-28

  Revised date: 2004-05-28

  Online published: 2004-05-28

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.

本文引用格式

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, 2004 , 10(2) : 168 -174 . DOI: 10.61558/2993-074X.3322

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.

参考文献

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