应用化学 ›› 1989, Vol. 0 ›› Issue (6): 48-52.

• 研究论文 • 上一篇    下一篇

十六烷基吡啶在玻碳电极表面上的吸附过程

朱永春, 董绍俊   

  1. 中国科学院长春应用化学研究所
  • 收稿日期:1988-03-24 修回日期:1989-03-25 出版日期:1989-12-10 发布日期:1989-12-10

STUDY ON THE ADSORPTION OF CETYL PYRIDINIUM BROMIDE ON GC ELECTRODE SURFACE

Zhu Yongchun, Dong Shaojun   

  1. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1988-03-24 Revised:1989-03-25 Published:1989-12-10 Online:1989-12-10

摘要: 本文用交流阻抗法在长光程薄层光谱电解池中研究了溴化十六烷基吡啶(CPyBr)在玻碳电极上的吸附过程。在复数平面图的高频区获得了与电解池结构电容有关的半圆,低频区获得了与CPyBr吸附有关的阻抗及Warburg阻抗,建立了CPyBr的单分子层吸附模型及电极过程的交流阻抗等效电路。理论预测与实验数据吻合较好。

关键词: 交流阻抗测量, 表面活性剂, 溴化十六烷基吡啶, 电化学分析, 表面吸附

Abstract: The adsorption process of cetyl pyridinium bromide (CPyBr) on glassy carbon (GC)electrode surface in a long optical path length thin-layer cell(LOPLTC) has been investigated by an AC impedance measurement. In the high freqency region of the AC impedance complex diagram, the capacity obtained from a large semicircle with rotation was 4 times larger than that theoretically calculated from a parallel plate condenser. In the low frequency region the impedance diagrams were related to the adsorption of CPyBr and the Warburg′s impedance. A charge transfer model between the layer of CPyBradsorbed on GC electrode surface and the bulk soluticn has been suggested. A low value ofdiffusion coefficient and large fluid dynamics radius of CPyBr (r=352Å) were calculated from Warburg′s impedance. An equivalent circuit for the impedance in the whole frequency tested has been suggested.

Key words: AC impedanoc measurement, Surfactant, Cetyl pyridinium bromide, Surface adsorption, Electrochemiscal analysis