溶剂及电解质盐对氧在有机电解液体系中电化学还原的影响

doi:10.61558/2993-074X.2064

电化学（中英文） ›› 2010, Vol. 16 ›› Issue (4): 420-424. doi: 10.61558/2993-074X.2064

溶剂及电解质盐对氧在有机电解液体系中电化学还原的影响

田艳艳;武巍;高军;杨勇;

厦门大学固体表面物理化学国家重点实验室化学化工学院化学系;

收稿日期:2010-11-28 修回日期:2010-11-28 出版日期:2010-11-28 发布日期:2010-11-28

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

TIAN Yan-yan,WU Wei,GAO Jun,YANG Yong

(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

Received:2010-11-28 Revised:2010-11-28 Published:2010-11-28 Online:2010-11-28

摘要/Abstract

摘要： 应用线性循环伏安(CV)法研究了氧在几种有机电解液体系中的电化学还原过程.实验表明,氧在四丁基六氟磷酸铵(TBAPF6)/乙腈(MeCN)或TBAPF6/丙烯碳酸酯(PC)电解液中,均首先发生1电子还原生成O2-的过程,但电位回扫还原过程的可逆性却表现出很大差异:在乙腈溶液中反应可逆性较好,CV曲线表现出一对可逆的氧化还原峰,而在丙烯碳酸酯为溶剂的电解液中,氧还原过程可逆性差,不仅初始氧还原电流显著减小,而且表征O2-氧化的电流峰几乎消失.此外,电解质盐对氧还原过程也具有很大影响,在六氟磷酸锂(LiPF6)/乙腈电解液中,氧的还原可逆性较差.

关键词: 有机电解液体系, 锂氧电池, 氧还原, 1电子还原

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.

Key words: organic electrolyte system, lithium oxygen battery, oxygen reduction, 1e-reduction

中图分类号:

O646.54

田艳艳, 武巍, 高军, 杨勇, . 溶剂及电解质盐对氧在有机电解液体系中电化学还原的影响[J]. 电化学（中英文）, 2010, 16(4): 420-424.

TIAN Yan-yan, WU Wei, GAO Jun, YANG Yong. 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.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.61558/2993-074X.2064

https://electrochem.xmu.edu.cn/CN/Y2010/V16/I4/420

参考文献

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溶剂及电解质盐对氧在有机电解液体系中电化学还原的影响

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

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