高电化学性能三维网状氮掺杂石墨烯的制备

以氧化石墨烯(GO)为原料，三聚氰胺为还原剂和氮掺杂剂，经过水热法制备出了氮掺杂石墨烯(NRG)三维网络.通过扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、拉曼光谱(Raman)、氮气吸脱附分析和电化学表征等测试手段对样品的形貌、结构和电化学性能进行表征.结果表明：三聚氰胺在水热的条件下有效地将GO还原并实现氮掺杂，三聚氰胺将氧化石墨烯还原之后，使得石墨烯之间的相互作用力增强，从而使石墨烯搭建出三维网络结构，其氮含量可达4.37%.电化学测试表明，当GO与三聚氰胺质量比为1∶2 (NRG-2)时，在1 A/g时其最大比电容值达到了296 F/g，这个比电容值高于其他不同GO与三聚氰胺质量比所制备出的氮掺杂石墨烯的比电容值.NRG-2还显示出优良的循环寿命，经过1 000次恒电流充放电循环后比电容保留量为88.5%.
3D nitrogen-doped graphene (NRG) was prepared in the hydrothermal method with graphene oxide (GO) as the raw material and melamine as the nitrogenous source and reducing agent. Scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, nitrogen adsorption-desorption analysis and electrochemical measurements were used to characterize the morphology, structure, components and supercapacitor performance of as-prepared electrode materials. The results showed that GO could be reduced efficiently by melamine and realized N-doping at the same time. The 3D structure was built due to the strong interaction between graphene sheets. Its content of nitrogen atoms was 4.37%. The electrochemical performance was measured through electrochemical tests. When the mass ratio of GO and melamine was 1∶2 (NRG-2), the highest specific capacitance of 296 F/g can be achieved at the current density of 1 A/g, which was higher than the capacitance of other mass ratios of GO and melamine. 88.5% of the capacitance of NRG-2 remained after 1000 cycles, which meant that NRG-2 had a long life cycle.