物理化学学报 >> 1998, Vol. 14 >> Issue (09): 833-840.doi: 10.3866/PKU.WHXB19980913

研究论文 上一篇    下一篇

连续电荷传递反应的阻抗谱与电极反应机制的关系

马厚义, 李桂秋, 陈慎豪   

  1. 山东大学化学系，山东大学光电子信息工程系，济南 250100
  • 收稿日期:1997-11-24 修回日期:1998-04-23 发布日期:1998-09-15
  • 通讯作者: 陈慎豪

Relations between the ElS and Mechanism for the Consecutive Charge-Transfer Reaction

Ma Hou-Yi, Li Gui-Qiu, Chen Shen-Hao   

  1. Department of Chemistry,Department of Photo-Electronic Information Engineering,Shandong University,Jinan,250100
  • Received:1997-11-24 Revised:1998-04-23 Published:1998-09-15
  • Contact: Chen Shen-Hao

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摘要：

对于含有一个吸附中间物的不可逆连续电荷传递反应，在较低的过电位下，电极过程的Faraday阻抗通常在复平面上显示一个低频感抗弧．在较高的过电位下，这个感抗弧将转化为容抗弧，这一转变预示着速控步骤的变化．相反，当反应速率一直被其中的一个步骤控制时，它的法拉第弛豫始终表现出容抗行为．

关键词: 吸附中间物, 法拉第弛豫, 电化学阻抗谱

Abstract:

For an irreversible consecutive charge-transfer reaction with an adsorbed intermediate species. its faradaic impedance usually displays a low frequency inductive are in the complex plane at the lower overpotentials. Moreover, the inductive are will transform into a capacitive one at the higher overpotentials, which implies a change of the rate-determining step for this reaction. On the contrary the faradaic relaxation at low frequency shows the capacitive behavior provided the rate of reaction is controlled by one step all along the reaction.

Key words: Adsorbed intermediate species, The faradaic relaxation, Electrochemical Impedance Spectroscopy(ElS)