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高等学校化学研究 ›› 1993, Vol. 9 ›› Issue (2): 110-115.

• Articles • 上一篇    下一篇

The i-E Equations of Steady-state Voltammograms at Microdisk Electrodes

ZHUANG Qian-kun, CHEN Hong-yuan   

  1. Department of Chemistry, Nanjing University, Nanjing, 210008
  • 收稿日期:1992-07-16 出版日期:1993-04-24 发布日期:2011-08-17
  • 基金资助:

    Supported by the National Natural Science Foundation of China; Changchun Institute of Applied Chemistry of Chinese Academy of Sciences

The i-E Equations of Steady-state Voltammograms at Microdisk Electrodes

ZHUANG Qian-kun, CHEN Hong-yuan   

  1. Department of Chemistry, Nanjing University, Nanjing, 210008
  • Received:1992-07-16 Online:1993-04-24 Published:2011-08-17
  • Supported by:

    Supported by the National Natural Science Foundation of China; Changchun Institute of Applied Chemistry of Chinese Academy of Sciences

PDF (PC)

摘要： Based on the theories of conventional electrodes, as well as the properties of microdisk electrode, the i-Eequations for chronoamperometry at disk microelectrode for reversible, quasi-reversible and irreversible systems are derived. Steady-state voltammograms for the oxidation of [Fe(CN)6]4-, Fe2+ and ascorbic acid were measured at a series of microdisk electrodes with different radii. The conventional log-plot shows that oxidations of [Fe(CN)6]4- and ascorbic acid are reversible and totally irreversible, respectively, but the oxidation of Fe2+ is reversible at larger radius microdisk electrodes and quasi-reversible at smaller radius microdisk electrodes. The application of the log-plot to the voltammograms yielded a straight line, its slope allows us to evaluate the charge transfer coefficient and the intercept gives values of the electron transfer rate constant.

关键词: i-E equation, Microdisk electrode, Steady-state votammograms

Abstract: Based on the theories of conventional electrodes, as well as the properties of microdisk electrode, the i-Eequations for chronoamperometry at disk microelectrode for reversible, quasi-reversible and irreversible systems are derived. Steady-state voltammograms for the oxidation of [Fe(CN)6]4-, Fe2+ and ascorbic acid were measured at a series of microdisk electrodes with different radii. The conventional log-plot shows that oxidations of [Fe(CN)6]4- and ascorbic acid are reversible and totally irreversible, respectively, but the oxidation of Fe2+ is reversible at larger radius microdisk electrodes and quasi-reversible at smaller radius microdisk electrodes. The application of the log-plot to the voltammograms yielded a straight line, its slope allows us to evaluate the charge transfer coefficient and the intercept gives values of the electron transfer rate constant.

Key words: i-E equation, Microdisk electrode, Steady-state votammograms