物理化学学报 >> 1992, Vol. 8 >> Issue (01): 82-86.doi: 10.3866/PKU.WHXB19920115

研究论文 上一篇    下一篇

聚苯胺薄膜修饰电极对抗坏血酸的电催化氧化

董绍俊; 宋发益   

  1. 中国科学院长春应用化学研究所电分析化学开放实验室,长春 130022
  • 收稿日期:1990-09-24 修回日期:1991-04-20 发布日期:1992-02-15
  • 通讯作者: 董绍俊

Electrocatalytic Oxidation of Ascorbic Acid at Polyaniline Film Modified Glassy Carbon Electrodes

Dong Shao-Jun; Song Fa-Yi   

  1. Laboratory of Electroanalytical Chemistry of Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1990-09-24 Revised:1991-04-20 Published:1992-02-15
  • Contact: Dong Shao-Jun

摘要: 本文表明聚苯胺(PAn)薄膜修饰电极对水溶液中的抗坏血酸(AH_2)在较宽的pH范围和较宽的浓度范围内均有良好的电催化氧化作用, 为EC平行催化过程。利用旋转圆盘电极(RDE)进行了催化过程动力学分析, 求出了催化反应动力学参数。在抗坏血酸浓度10~(-2)~10~(-6) mol·L~(-1)范围内, 催化峰电流与AH_2浓度均成良好的线性关系, 且PAn薄膜修饰电极具有很好的稳定性, 有应用分析抗坏血酸的意义。

关键词: 聚苯胺, 修饰电极, 抗坏血酸, 电催化氧化, 动力学

Abstract: A conducting polyaniline (PAn) film modified glassy carbon (GC) electrode was prepared by electrochemical polymerization. The electrochemical behavior of ascorbic acid (AH_2) in aqueous solution at this PAn modified electrode was studied in detail. The experimental results show that PAn film modified electrode has good electrocatalytic activity on the oxidation of ascorbic acid in aqueous solution over a wide range of pH value, among which pH 4 is the optimum condition. The oxidation process of ascorbic acid at PAn film electrode can be regarded as an EC catalytic mechanism. The kinetic process of the catalytic reaction was investigated by rotating disk electrode (RDE) coated with PAn films. The rate constant of the catalytic reaction was evaluated. The catalytic peak currents are proportional to the concentrations of ascorbic acid in the range of 5×10~(-2)—1×10~(-6) mol·L~(-1). The PAn film electrodes give very stable responce for the oxidation of ascorbic acid. The present investigation shows the posibility of using PAn film modified electrode for the determination of ascorbic acid.

Key words: Polyaniline, Ascorbic acid, Electrocatalytic oxidation, Kinetics, Modified electrode