引用本文:
董绍俊, 宋发益. 聚苯胺薄膜修饰电极对抗坏血酸的电催化氧化[J]. 物理化学学报,
1992, 8(01): 82-86.
doi:
10.3866/PKU.WHXB19920115
Citation: Dong Shao-Jun, Song Fa-Yi. Electrocatalytic Oxidation of Ascorbic Acid at Polyaniline Film Modified Glassy Carbon Electrodes[J]. Acta Physico-Chimica Sinica, 1992, 8(01): 82-86. doi: 10.3866/PKU.WHXB19920115
Citation: Dong Shao-Jun, Song Fa-Yi. Electrocatalytic Oxidation of Ascorbic Acid at Polyaniline Film Modified Glassy Carbon Electrodes[J]. Acta Physico-Chimica Sinica, 1992, 8(01): 82-86. doi: 10.3866/PKU.WHXB19920115
聚苯胺薄膜修饰电极对抗坏血酸的电催化氧化
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。
English
Electrocatalytic Oxidation of Ascorbic Acid at Polyaniline Film Modified Glassy Carbon Electrodes
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 od 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.
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