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Citation: Su Yu-Zhi, Guo Shi-Heng, Xiao Yi-Zhi, Xiao Min, Yang Qi-Qin. Electrode Kinetics of 2,2’-diaminophenyloxydisulfide[J]. Acta Physico-Chimica Sinica, ;2004, 20(05): 518-523. doi: 10.3866/PKU.WHXB20040515 shu

Electrode Kinetics of 2,2’-diaminophenyloxydisulfide

1.
Department of Chemistry, School of Biological and Chemical Engineering, Guangzhou University, Guangzhou　510405;Department of Chemistry, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou　510275

Received Date: 31 October 2003
Available Online: 15 May 2004

A novel organic disulfide, 2,2’-diaminophenyloxydisulfide(DAPOD), has been proposed as a material of energy storage. The electrochemical study of this disulfide-thiolate redox couple has been studied on platinum, ld, glassy carbon or graphite electrode in AN/THF solution containing DAPOD and LiClO4 supporting electrolytes by potential cyclic sweep voltammetry, potential linear sweep voltammetry and rotating disk electrode technique. The CV results imply that the redox reactions of DAPOD are chemically reversible, yet kinetically hindered. The slow electrode kinetics indicates that the introduction of electrocatalysis to assist the electrode reaction may be effective in providing better performance. The observed reaction orders for DAPOD are 0.5 in the cathodic direction and 1 in the anodic direction. These results show that two electrons are involved in redox reaction of DAPOD, and that the reduction of the organodisulfide to the corresponding thiolate anions proceeds in two steps: the first step, chemical reaction, is at equilibrium, while the second step, charge-transfer reaction, is rate determining step. The kinetic constants such as transfer coefficients, exchange current, equilibrium potential and standard rate constant were determined. The electrochemical behavior of DAPOD at different electrode materials indicates that the graphite electrode demonstrates the electrocatalytic action to the electrode kinetics of DAPOD.
- 2,2’-diaminophenyloxydisulfide;Electrode kinetics;Reaction mechanism; Kinetic constant;Electrode material
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