聚2，5－二甲氧基苯胺膜电极对抗坏血酸的电催化氧化

聚２，５－二甲氧基苯胺（Ｐ２５ＤＭＡｎ）薄膜电极用电聚合的方法制得．采用循环伏安法研究了酸性溶液中抗坏血酸（ＡＨ２）在Ｐ２５ＤＭＡｎ薄膜电极上的电催化氧化．该薄膜电极对抗坏血酸的氧化有很好的电催化活性．讨论了不同种类负离子存在的情况下制成的薄膜对ＡＨ２氧化的催化特性的影响．光电子能谱图所得的结果也证明了Ｐ２５ＤＭＡｎ薄膜电极上有ＡＨ２反应的物种产生．用旋转圆盘电极研究了催化过程动力学．

The studies on the electrocatalytic oxidation of ascorbic acid at Poly(2, 5-dimethoxyaniline) film electrodes

Poly (2, 5-dimethoxyaniline)(P25DMAn) film electrodes were prepared by electrochemical polymerization. The catalytic activity of electrochemical oxidation of ascorbic acid in acidic aqueous solution at poly (2,5-dimethoxyaniline) film electrode was stUdied by cyclic voltammetry. The film electrode exhibited the excellent electrocatalytic activity for oxidetion of ascorbic acid. Since the poly(2,5-dimethoxyaniline)film electrodes contain different anions(coullterions)which is due to using different acids in polymerization, the film electrodes also exhibite different catalytic activity for oxidation of ascorbic acid. The intsnsity change of spetral line of the x-ray photoelectron spectra of the elementS shows that the formation of new species on the electrode surface after electrode reaction of ascorbic acid, which provides a evidence of catalytic oxidation of ascorbic acid. The kinetic process of the catalytic reaction was investigated by roasting disk electrode(RDE)coated with P25DMAn film.