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以天然鳞片石墨为原料,采用改进的Hummers法制备了氧化石墨烯(GO),然后以GO为碳源、水合肼为还原剂、氨水为氮源,用水热法制备了具有不同电催化活性的掺氮石墨烯(NG)。扫描电子显微镜、X-射线衍射、热重分析和比表面分析的表征结果显示,制得的NG晶格结构没有发生明显变化,表面褶皱和重叠增加,掺氮能提高石墨烯(Gr)的热稳定性、增大其比表面积。通过循环伏安法测试了NG修饰玻碳电极(NG/GCE)对对苯二酚(HQ)、邻苯二酚(CC)和间苯二酚(RC)的电催化活性。结果表明:掺氮能有效改善Gr的电化学性能,HQ、CC和RC在2.0mL氨水下所制NG/GCE上的电流强度分别是Gr修饰电极强度的6.5、5.1和2.5倍,且能实现对HQ、CC和RC三者的同时检测。
Using natural flake graphite as raw material, GO was prepared by the modified Hummers method. GO was used as carbon source, hydrazine hydrate as reducing agent and ammonia as nitrogen source. Hydrothermal method was used to prepare GO with different electrocatalytic activity Nitrogen-doped graphene (NG). The results of scanning electron microscopy, X-ray diffraction, thermogravimetric analysis and specific surface analysis show that there is no obvious change in the lattice structure of the prepared NG, and the surface wrinkles and overlap increase. Nitrogen can increase the heat of graphene (Gr) Stability, increase its specific surface area. The electrocatalytic activity of NG / GCE on hydroquinone (HQ), catechol (CC) and resorcinol (RC) was investigated by cyclic voltammetry. The results showed that the electrochemical performance of Gr was improved by nitrogen. The current intensities of NG, GQCE and HQ, CC and RC prepared under 2.0mL ammonia water were respectively 6.5, 5.1 and 2.5 times of that of Gr modified electrode, Simultaneous detection of HQ, CC and RC.