高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (1): 103.

• 论文 • 上一篇    下一篇

电化学石英晶体微天平对银电极氧化还原过程的研究

陈胜利, 吴秉亮, 杨汉西   

  1. 武汉大学化学系, 武汉, 430072
  • 收稿日期:1993-03-09 修回日期:1993-08-02 出版日期:1994-01-24 发布日期:1994-01-24
  • 通讯作者: 吴秉亮
  • 作者简介:陈胜利,男,24岁,博士研究生.
  • 基金资助:

    国家自然科学基金;中国科学院腐蚀科学开放实验室基金

Studies on the Redox Process of Silver Using Electrochemical Quartz Crystal Microbalance

CHEN Sheng-Li, WU Bing-Liang, YANG Han-Xi   

  1. Department of Chemistry, Wuhan University, Wuhan, 430072
  • Received:1993-03-09 Revised:1993-08-02 Online:1994-01-24 Published:1994-01-24

PDF (PC)

被引次数

8

摘要： 建立了电化学石英晶体微天平(EQCM)-循环伏安联用技术,并以此研究了碱性溶液中银的氧化还原行为。在伏安扫描的同时,现场记录电极表面的质量变化,得到与电流-电势曲线相对应的质量-电势谱。结果表明本体Ag2O形成之前银溶解和生成表面化合物的过程共存,阴极方向的氧化峰确实是AgO的继续生成;在AgO还原为Ag2O的阶段观察到了异常的质量变化,并进行了讨论。

关键词: 电化学石英晶体微天平, 银电极, 质量响应

Abstract: Combined with cyclic voltammetry,the Electrochemical Quartz Crystal Microbalance(EQCM) technique was used to study the redox behavior of silver in an alkaline solution.By insitu recording the change of mass in the process of polarization,the dependence of mass on voltage in accordance with the cyclic voltammogram was obtained.Before the formation of the bulk of Ag2O,a process of competition between the dissolution and the formation of AgOH(or hydrous Ag2O) surface-layer was detected.Alittle unexpected increase of mass was found at the beginning of the reduction of AgO to Ag2O,and the exceptional increase was discussed in terms of formation of a surface-compound and the change in the double layer structure.Acomparison was made between the measuring time derivative of the frequency and the calculating value based on current.According to this comparison,we valued the effectivity of EQCM in the study of the process of phase transfermation.

Key words: Quartz crystal microbalance(QCM), Silver electrode, Mass response

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