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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Effects of surface modification on electrochemical performance of MnO2
LIU Li-qing(刘立清)1, WANG Jian-ming(王建明)1
FAN Yu-kai(范玉凯)1, WANG Guo-guang(王国光)1, ZHANG Jian-qing(张鉴清)1,2

1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China; 
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China

Abstract: The MnO2 samples coated with Ca(OH)2 were prepared by a liquid-phase surface treatment method. The physical properties of the samples were examined by SEM, EDAX and chemical analysis, and their electrochemical performances were investigated by means of galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The SEM results show that the samples coated with Ca(OH)2 display a porous surface structure. The electrochemical experiments indicate that the surface modification decreases the polarization of MnO2 electrodes and improves their discharge potentials and discharge capacities.

 

Key words: manganese dioxide; surface modification; cyclic voltammetry; electrochemical impedance spectroscopy 

ISSN 1672-7029
CN 43-1423/U

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