碳纳米管负载纳米Ni修饰电极及碱液中电氧化甲醇

Glass Carbon Electrode Modified with Nanocrystalline Nickel-decorated Carbon Nanotubes and Its Electrocatalysis of Methanol Oxidation in Alkaline Solution

采用湿化学法在碳纳米管(MWCNTs)上负载Ni纳米粒子(MWCNTs-Ni),并制备MWCNTs-Ni修饰玻碳电极(MWCNTs-Ni/GCE),用X射线粉末衍射和透射电子显微镜测试技术对MWCNTs-Ni的物相和形貌进行了表征,通过循环伏安法研究了该修饰电极在碱性介质中的电化学行为以及对甲醇的电催化氧化作用。结果表明,面心立方的Ni纳米粒子均匀分散在碳纳米管表面,平均粒径约为16 nm,MWCNTs-Ni/GCE在碱性介质中的电化学行为是受扩散控制的准可逆过程,对甲醇的电催化氧化具有较高的电催化活性。

Nanocrystalline nickel with an average diameter of about 16 nm and a face-centered cubic（fcc） structure were uniformly attached to the surface of multi-wall carbon nanotubes by wet chemistry, and the product was characterized by X-ray power diffraction and transmission electron microscopy. A glass carbon electrode modified with the nickel-decorated carbon nanotubes （MWCNTs-Ni/GCE） was prepared. The electrochemical behavior of the MWCNTs-Ni/GCE and the electrocatalytic oxidation of methanol at the MWCNTsNi/GCE were investigated by means of cyclic voltammetry in 1.0 mol/L NaOH solution. The cyclic voltammetry showed the electron transfer of β-Ni（OH） 2→← β-NiOOH is mainly a diffusion-controlled quasi-reversible process, and the high catalytic activity of the electrode for the electro-oxidation of methanol in alkaline medium suggests its potential application in alkaline rechargeable batteries and fuel cells.