葡萄糖在碳纳米管负载钴修饰电极上的电催化氧化

Electrocatalytic Oxidation of Glucose at Glass Carbon Electrode Modified with Cobalt Nanoparticles Supported on Carbon Nanotubes

以碳纳米管为模板采用湿化学法制备碳纳米管负载纳米钴(Co/CNTs)复合材料,用X射线粉末衍射(XRD)和透射电镜(TEM)对Co/CNTs进行表征,通过循环伏安法(CV)和电化学交流阻抗法(EIS)对碳管负载纳米钴修饰玻碳电极(Co-CNTs/GCE)在碱液中进行电化学行为和对葡萄糖电催化氧化的研究.结果表明:平均粒径约为21nm的面心立方结构Co纳米粒子均匀分散在碳纳米管上;Co-CNTs/GCE在碱性介质中的电化学行为既受电化学控制又受扩散控制的准可逆过程;Co-CNTs/GCE在碱性介质中对葡萄糖具有较高的催化活性,其电催化氧化过程主要是受电极表面的多孔催化层内薄液界面上扩散控制.

Cobalt nanoparticles with average diameters about 21 nm and face-centered cubic （fcc） structure were uniformly attached on the surface of the carbon nanotubes （Co/CNTs） by wet chemistry, which were characterized by X-ray powder diffraction （XRD） and transmission electron microscopy （TEM）. A glass carbon electrode modified with cobalt-decorated carbon nanotubes（Co-CNTs/GCE） was prepared. The electrochemical behavior of Co-CNTs/GCE and the electrocatalytic oxidation of glucose were investigated by cyclic voltammetry （CV） and electrochemical impedance （EIS） in 1.0 tool/ L NaOH solution. The cyclic voltammetry and electrochemical impedance results indicate that the Co-CNTs/GCE possesses both electrochemical-controlled and diffusion-controlled quasi-reversible process, and highly catalytic activity for the electro-oxidation of glucose in alkaline medium.