Effects of Solvents and Electrolyte Salts on the Electrochemical Reduction of Oxygen in Non-aqueous Electrolytes

Authors

Yan-yan TIAN, State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Wei WU, State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Jun GAO, State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Yong YANG, State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;

Abstract

The electrochemical reduction processes of oxygen in different non-aqueous solvents such as acetonitrile(MeCN),propylene carbonate(PC) and their mixtures were investigated by cyclic voltammetry method.The results indicated a one electron reduction of oxygen to O2-occured in these systems as a first step reduction,no matter whether in tetrabutylammonium hexafluorophosphate(TBAPF6)/MeCN or TBAPF6/PC electrolyte.However,the CV curves in 0.1 mol·L-1 TBAPF6/MeCN showed a couple of reversible redox peaks,indicating that the reduction process of oxygen was irreversible in the 0.1 mol·L-1 TBAPF6/PC electrolyte.In the PC-based electrolyte,the reduction current peak reduced largely and the oxidation peak of O2-almost disappeared as compared to that of the former electrolytes.The possible interaction mechanism between O2-and propylene carbonate is proposed.In addition,the kind of salts in solution has great effect on the reduction process of oxygen.

Keywords

organic electrolyte system, lithium oxygen battery, oxygen reduction, 1e-reduction

DOI Link

https://doi.org/10.61558/2993-074X.2064

Publication Date

2010-11-28

Online Available Date

2010-11-28

Revised Date

2010-11-28

Received Date

2010-11-28

Recommended Citation

Yan-yan TIAN, Wei WU, Jun GAO, Yong YANG. Effects of Solvents and Electrolyte Salts on the Electrochemical Reduction of Oxygen in Non-aqueous Electrolytes[J]. Journal of Electrochemistry, 2010 , 16(4): 420-424.
DOI: 10.61558/2993-074X.2064
Available at: https://jelectrochem.xmu.edu.cn/journal/vol16/iss4/10