中文摘要：

采用循环伏安法、微分脉冲伏安法、计时安培法研究了对苯二酚在多壁碳纳米管修饰电极上的电化学行为，计算得到了碳纳米管修饰电极有效面积Aeff=23．91mm^2。以及对苯二酚电化学氧化过程的一些重要参数：传递系数α=0．630；控制步骤的反应电子数nα=1．03；反应速率常数k＇=3．74×10^-2cm／s；扩散系数D=2．85×10^-6cm^2／s。实验结果显示，本实验条件下对苯二酚在碳纳米管修饰电极上的氧化反应受扩散过程控制，为前行化学反应（CE），对苯二酚在失去电子之前先经历了一个脱氢的过程。微分脉冲伏安结果显示，催化氧化峰电流与对苯二酚浓度在1×10^-4～6×10^-6mol／L范围内呈良好的线性关系，检出限达4．0×10^-7mol／L（S／N=3）。

英文摘要：

Electrochemical behavior of p-benzenediol on multi-walled carbon nanotubes modified electrode（MWCNME） was investigated by using cyclic voltammetry, chronoamperometry, and differential pulse voltammetry. The important electrochemical parameters including the effective area of MWCNME Aeff =23.9 mm^2 , the electron transfer rate constant k＇ =3.74 × 10^-2 cm/s, the transfer coefficient α = 0. 630, the number of electrons involved in the rate determining step n α= 1.03 and the diffusion coefficient D =2.85 × 10^-6 cm^2/s were calculated. The results of cyclic voltammetry suggest that the oxidation process of p-benzenediol on MWCNME is a CE electrode process. In 0.05 mol/L phosphate buffer （ pH 6.0） and by differential pulse voltammetric mode, there was an excellent linearity between oxidation current and concentration ofp-benzenediol in the range of 1 × 10^-4 -6 × 10^-6 mol/L with a detection limit of 4.0 × 10^ -7 mol/L.