高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (5): 717.

• 论文 • 上一篇    下一篇

分子筛修饰电极中内电子传输机理的研究

姜艳霞1, 宋文波1, 刘颖1, 吕男1, 邹明珠1, 许宏鼎1, 张爱玲2   

  1. 1. 吉林大学化学系, 长春 130023;
    2. 沈阳工业大学, 沈阳 110023
  • 出版日期:1999-05-24 发布日期:1999-05-24
  • 通讯作者: 许宏鼎
  • 作者简介:姜艳霞,女,34岁,博士研究生.

Studies on Intrazeolite Electron Transfer Mechanism of Zeolite modified Electrodes

JIANG Yan-Xia1, SONG Wen-Bo1, LIU Ying1, Lü Nan1, ZOU Ming-Zhu1, XU Hong-Ding1, ZHANG Ai Ling2   

  1. 1. Department of Chemistry, Jilin University, Changchun, 130023;
    2. Shenyang Polytechnique University, Shenyang, 110023
  • Online:1999-05-24 Published:1999-05-24

摘要: 用电化学方法聚合分子筛孔道内的苯胺,以聚苯胺分子筛修饰电极为模型研究分子筛修饰电极的内电子传输机理.NaY分子筛的离子交换点位被苯胺修饰后,通过电聚合制得聚苯胺分子筛修饰电极(Pan+Y-ZME),该电极通过聚苯胺链自身的电子跳跃来实现电子传输,且只有通过阴极富集后对溶液中Cd2+才有响应,并能用于测定抗坏血酸.

关键词: 分子筛修饰电极, 聚苯胺, 内电子传输机理

Abstract: This paper is concerned with the mechanism of intrazeolite electron transfer in zeolite modified electrodes(ZMEs) where the zeolite have been modified with polyaniline. First, data were obtained from ZMEs prepared with zeolite Yloading aniline and the electropolymerizing of anilines was performed by cyclic voltammery. Polyaniline might not leak out from zeolite due to the bulk size of polyaniline being bigger than the channel of zeolite Y. At the absence of electron transfer mediators, the Pan +Y ZME showed the expected presence of electron hopping of adjacent polyaniline cations. Second, the data were obtained for the determining Cd 2+and ascorbic acid using Pan+Y-ZME. The Cd2+might not be preconcentrated at open circuit and could be done at constant potential. At the absence of ion exchange between zeolite and surrounding electrolyte the electron transfer was performed via the electron hopping, i.e . by an intrazeolite mechanism; rather than by an extrazeolite mechanism. In addition, the ascorbic acid molecule and its anion could not cross zeolite film to base electrode therefore, its current was conducted also by the electron hopping between the chains of polyaniline. Experimental results indicate that the electron transfer of Pan+Y-ZME was dominated by intrazeolite processes.

Key words: Zeolite modified electrode, Polyaniline, Intrazeolite electron transfer

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