Ag-石墨烯的制备及修饰电极对对苯二酚的电催化氧化

Fabrication of Ag-graphene and electrocatalytic activity of modified electrode for hydroquinone

以石墨为原料,用改进的Hummers法制备了氧化石墨(GO),以葡萄糖为还原剂,采用一步还原法制备了Ag-石墨烯(Ag-Gr)纳米复合材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、热重分析(TGA)等手段对复合材料的结构及形貌进行了表征,并用循环伏安法考察了复合材料的电化学性能。结果表明:氧化石墨和银离子在葡萄糖的作用下,氧化石墨失去部分含氧官能团,被还原为石墨烯(Gr),银离子被还原为银纳米颗粒,均匀分布在石墨烯片层表面;在p H值为7.0,Ag-石墨烯浓度为2.5 mg/m L时,Ag-石墨烯修饰玻碳电极对对苯二酚具有良好的电催化氧化作用。

Graphite oxide（ GO） was prepared by a modified Hummers method with the graphite as raw material,and the silver-graphene（ Ag-Gr） nanocomposite was fabricated in one step using glucose as a reducing agent. The structure and morphology of the nanocomposite was characterized using X-ray diffraction（ XRD）,a scanning electron microscope（ SEM）,and thermogravimetric analysis（ TGA）. In addition,the electrochemical properties of the nanocomposite were investigated using cyclic voltammetry（ CV）. The results showed that GO was partially reduced to graphene（ Gr）,while Ag＋was reduced to an Ag nanopartical and evenly distributed on the surface layer of graphene. The Ag-Gr nanocomposite-modified electrode has excellent electrocatalytic activity for the oxidation of hydroquinone with a p H of 7. 0 and the concentration of the Ag-Gr nanocomposite was 2. 5mg / m L.