多壁碳纳米管修饰电极对抗坏血酸的电催化作用

Electrocatalytic Action of Ascorbic Acid at Modified Glassy Carbon Electrode of Multi-wall Carbon Nanotubes

对抗坏血酸在多壁碳纳米管修饰电极上的电化学行为的研究表明，与裸玻碳电极相比，抗坏血酸在多壁碳纳米管修饰电极上具有更高的氧化峰电流和更低的氧化电位。实验优化了支持电解质、pH值、扫描速度等测定条件，此法测定抗坏血酸的线性范围为（1．0×10^-5～5．0×10^-4）mol·L，检测下限为8．0×10^-7mol·L^-1,此修饰电极制作简便，重现性和稳定性较好。

The electrocatalytic action of ascorbic acid at modified electrode of multi-- wall carbon nanotubes is studied. Comparing with the bare glassy electrode （GCE）, multi--wall carbon nanotubes （MWNT）- modified GCE can greatly enhance the oxidation peak current and lowness the oxidation potential. In this experimentation, the condition for determination of ascorbic acid is optimized, such as support--electrolyte, pH and scan speed. The oxidation peak current changes linearly with the concentration of ascorbic acid over the range from 1.0 × 10^-5 to 5.0 × 10^-4 mol · L^-1 ,and the detection limit can reach 8.0 × 10^-7 mol · L^-1. This multi--wall carbon nanotube （MWNT）--modified GCE have several excellence characters at convenient conduction, fidelity and stabilization.