蒙脱土-染料修饰电极制备及其对抗坏血酸的催化作用  

Preparation of Clay-dye Modified Electrode and Its Catalytic Effect on Ascorbic Acid

作　　者：王华伟[1] 沈报恩[1] 孙茂松 王国顺[1] 彭图治[1] 

机构地区：[1]杭州大学化学系,310028

出　　处：《科技通报》1993年第1期14-18,共5页Bulletin of Science and Technology

基　　金：中科院长春应用化学研究所电分析开放实验室资助项目

摘　　要：用蒙脱土制备了蒙脱土/SnO_2/染料(靛蓝胭脂红)化学修饰电极.循环伏安图表明,有机染料分子可以持留在蒙脱上膜中,并显示出电化学活性.用蒙脱土制备的化学修饰电极(CME)可以很大地改进电极反应的稳定性.电活性物在蒙脱土膜中的电化学行为是受扩散控制的.测得扩散系数的数量级为10^(-10)cm^2/s.所制得的蒙脱土/SnO_2/染料化学修饰电极对抗坏血酸的电化学氧化显示电催化作用,使它的氧化电位降低了100mV.Clay/SnO_2 modified electrode(CME) was prepared with natural montmorillonite. Cyclic voltammogram shows that the organic dye (indigo carmine) can be remained in the clay film and reveals electrochemical ac- tivity. The stability of electrode reaction was significantly improved by using montmorillonite CME. The electrochemical behavior of the electroactive species in clay film was diffusion-controlled and the measured diffusion coefficient was of the order of 10^(-10)cm^2/s. The prepared clay-dye CME exhibits catalytic effect on the electrochemical oxidation of ascorbic acid making oxidation over-potential decrease by 100mV.

关 键 词：蒙脱土 靛蓝胭脂红 电极 抗坏血酸 

分 类 号：O646.5[理学—物理化学]