Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 10    No. 4    August 2000

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Electrochemical reaction mechanism of aqueous polysulfide solution①
YI Qing-feng(易清风)1, CHEN Qi-yuan(陈启元)2,
ZHOU Ji-hong(周继红)2, ZHANG Ping-min(张平民)2

1. Department of Chemical Engineering, Xiangtan Polytechnic University,
Xiangtan 411201, P.R.China;
2. Department of Chemistry, Central South University of Technology,
Changsha 410083, P.R.China

Abstract:Cyclic voltammetry and choronopotentiometry studies on aqueous polysulfide solution at graphite anode have been reported. The experiments show that the anode oxidation of the polysulfide, which consists of several parallel electrode reactions and following chemical reactions, is an irreversible process, and that the potential peak in time potential curves for constant current steps indicates a self-catalysis process in the electrochemical oxidation of the polysulfide solution. It is found from further analysis for the cyclic voltammetry and choronopotentiometry that the number of electrons transferred in rate-determining process of the anode oxidation is close to 1, and that the reaction rate constant of self-catalysis is large. These results indicate that interreactions of the polysulfide are quick processes. The potential peak in the potential time curve disappears with the increase of the current.

 

Key words: polysulfide; voltammetry; electrolysis

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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