高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (3): 320.

• 论文 • 上一篇    下一篇

常规二脉冲叠加四阶跃微分伏安法

方禹之, 王韧儿, 仝威, 何品刚   

  1. 1. 华东师范大学化学系, 上海, 200062;
    2. 中国科学院长春应用化学研究所电分析化学开放实验室
  • 收稿日期:1991-10-15 出版日期:1992-03-24 发布日期:1992-03-24
  • 通讯作者: 方禹之

Normal Dual Pulse Superimposed Four Potential Step Differential Voltammetry

FANG Yu-zhi, WANG Ren-er, TONG Wei, HE Pin-gang   

  1. Department of Chemistry, East China Normal University, Shanghai, 200062
  • Received:1991-10-15 Online:1992-03-24 Published:1992-03-24

摘要: 常用的脉冲技术,如阶梯伏安法、微分脉冲伏安法、方波伏安法等,都是利用电容电流的衰减比法拉第电流快得多的特点,通过延时,在脉冲后期采样[1,2].其共同缺点是损失一部分法拉第电流,而且由于延时,扫描速率也很难提高.本文首次提出一种新型常规二脉冲叠加的四阶跃伏安法,在每个脉冲周期中,电位都回到初始电位,通过在4个相互反对称电位阶跃上采样电流的差分和叠加组合,使正反向脉冲引起的电容电流相互抵消,不需要通过较长的延时而牺牲法拉第电流,从而可提高扫描速率和灵敏度.这种新的脉冲扫描技术同时具有常规脉冲和微分脉冲伏安法的特点,灵敏度和扫描速率均优于微分脉冲伏安法,并适合于吸附体系和固体电极的研究.

关键词: 伏安法, 电位阶跃技术, 脉冲

Abstract: A new type normal dual pulse superimposed four potential step differential voltamme-try is proposed and realized on a microcomputer controlled voltammetric analyzer.The combination of differentiation and addition of samlping currents on four potential steps which are antisymmetric with each other respectively tends to offset the charging currents caused by forward and reverse potential steps.This new pulse technique has the merits of normal pulse voltammetry (NPV) and differential pulse voltammetry (DPV).At the same time, its rapid scan rate and short delaying time prior to current sampling make it more sensitive than DPVand suitable for the study of fast kinetics.

Key words: Voltammetry, Potential step techniques, Pulse

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