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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.
The electrochemical reduction of oxygen in several organic electrolyte systems was investigated by linear cyclic voltammetry (CV) .It was shown that the electrochemical reduction of oxygen in TBAPF6 / MeCN or TBAPF6 / Carbonate (PC) electrolyte, the process of 1-electron reduction to O2- was first carried out. However, the reversibility of the potential recovery showed a great difference: the reversibility of the reaction in acetonitrile was good, and the CV curve A reversible redox peak was obtained, but in the case of propylene carbonate as a solvent, the reversibility of the oxygen reduction process was poor, not only the initial oxygen reduction current was significantly reduced, but also the current peak characterizing O2-oxidation almost disappeared. In addition, the electrolyte Salt also has a great influence on the oxygen reduction process. In lithium hexafluorophosphate (LiPF6) / acetonitrile electrolyte, the oxygen reduction is less reversible.