以对苯二酚为目标化合物比较研究了金纳米粒子、碳纳米管、金纳米粒子/碳纳米管3种纳米粒子修饰电极的电催化性能,结果发现:3种纳米粒子修饰电极均对对苯二酚的电化学信号具有增强作用。电化学阻抗谱和修饰层数试验表明:金纳米粒子的增强效果来自于金纳米粒子的电催化作用,碳纳米管的增强作用来自于电催化作用与大的电极表面积,金纳米粒子/碳纳米管复合修饰电极综合利用了两种纳米粒子的特性,表现出了更为优良的电催化行为。对苯二酚在修饰电极上的电化学过程均为扩散控制过程。

The catalytic behavior on the redox reaction of hydroquinone at 3 GCE′s modified separately with gold nanoparticles, carbon nanotubes and composite of gold nanoparticles and carbon nanotubes was studied by cyclic voltammetry. It was found that enhancement of electrochemical response of redox reaction of hydroquinone at either of the 3 modified electrodes was observed. As shown by the electrochemical impedance spectra and by the results of testing for effect by quantity of the nanomaterials modified on the GCE, the enhancing effect at the Au nano-particles modified electrode was due to the electrocatalytic action of gold nano-particles, while the enhancing effect at the carbon nanotubes modified electrode was due to electrocatalytic action of carbon nanotubes as well as large surface area of the electrode. As for the composite modified electrode with both the Au nanoparticles and the carbon nanotubes, it behaved to have the peculiarities of both the modifying nanomaterials. It was also found that the electrochemical reaction of hydroquinone at either of the 3 modified electrodes was controlled by diffusion process.