高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (1): 148.

• 研究快报 • 上一篇    下一篇

超氧自由基电化学发生体系的研究

卫应亮, 王亚珍, 胡胜水   

  1. 武汉大学化学与分子科学学院, 武汉 430072
  • 收稿日期:2003-07-10 出版日期:2004-01-24 发布日期:2004-01-24
  • 通讯作者: 胡胜水(1946年出生),男,教授,博士生导师,从事生物电化学及电分析研究.E-mail:sshu@whu.edu.cn E-mail:sshu@whu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:60171023)资助

Studies on Electrochemical Generation System of Superoxide Free Radical

WEI Ying-Liang, WANG Ya-Zhen, HU Sheng-Shui   

  1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
  • Received:2003-07-10 Online:2004-01-24 Published:2004-01-24

关键词: 超氧自由基, 电化学发生, 表面活性剂, 石英晶体微天平

Abstract: A mercury-free solid electrode system for the electrochemical generation of O ·- 2 was described. The effects of pH, the amount of the surfactant and electrode materials on the reduction of O2 were investigated. The electrogeneration of O ·- 2 was only obtained at the Pt electrode in this medium system. The different electrochemical behaviour of O2 at Pt electrode and Au electrode were explained in terms of the different adsorptions of DSAB, which was confirmed by quartz crystal microbalance(QCM). The frequency responses for the reduction of O2 at Pt electrode and Au electrodes were compared by electrochemical quartz crystal microbalance(EQCM), suggesting that the electrogenerated O ·- 2 was adsorbed on the surface of the Pt electrode. The one-electron reduction of oxygen in this system was also confirmed by using chronocoulometry. The scavenging activities of two kinds of antioxidants(ascorbic acid and cysteine) were examined and compared.

Key words: Superoxide free radical, Electrochemical generation, Surfactant, Quartz crystal microbalance

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