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利用改进的Hummers方法经冷冻干燥制备氧化石墨(GO),以尿素为还原剂和掺氮剂,二甲基亚砜为溶剂,通过改变微波功率合成掺氮石墨烯.利用FT-IR、XRD、SEM、EDS、Raman、XPS、AFM对样品形貌结构进行表征分析,通过循环伏安、交流阻抗、恒流充放电对样品进行电化学测试.结果表明,在微波功率600W下得到的掺氮石墨烯,其掺氮量最高,达到7.64％,厚度为0.96 nm,片层为微米-纳米结构,在0.5 A/g电流密度下的比电容达到185 F/g.“,”The graphite oxide (GO) is prepared through freeze drying by the modified Hummers method.The nitrogen-doped graphene is synthesized by changing the microwave power with urea as nitrogen source and reducing agent,and dimethyl sulfoxide as solvent.The morphology and structure of the as-produced graphene samples are characterized by FT-IR,XRD,SEM,EDS,Raman,XPS and AFM.The electrochemical properties of samples are tested by cyclic voltammetry,AC impedance,and constant current charge and discharge.The results show that the nitrogen-doped graphene obtained at a microwave power of 600 W has the highest nitrogen content of 7.56 (wt) ％,a thickness of 1.2 nm,a lamellar with the micrometer-nanostructure and a specific capacitance of 185 F· g-1 at 0.5A·g-1 current density.