三维多孔石墨烯的制备及其电化学性能研究

电极材料的孔径结构、尺寸、类型直接影响电极材料的电化学性能。文章利用水热反应与硝酸蒸汽处理两步法制备了三维多孔石墨烯材料,并通过控制硝酸蒸汽处理时间,研究其对电极材料电化学特性的影响。通过扫描电镜、透射电镜、拉曼光谱、X射线衍射等多种测试方法对得到的三维多孔石墨烯进行表征,并利用三电极测试方法,通过循环伏安、恒流充放电和电化学阻抗等电化学测试方法研究其电化学性能。结果表明,所制备的三维多孔石墨烯具有微孔与纳米孔相结合的三维结构,两者的协同作用使得三维多孔石墨烯表现出优异的电化学性能,在1A/g的电流密度下,比电容最高可达191.5F/g。

Preparation and Electrochemical Properties of Three-dimensional Holey Graphene

The pore structure, size and type of electrode material directly affect its electrochemical properties. In this paper, three-dimensional porous graphene electrode materials were prepared by a two-step method of hydrothermal reaction and nitric acid steam treatment. The three-dimensional porous graphene was characterized by scanning electron microscope, transmission electron microscope, Raman spectrum and X-ray diffraction. And the electrochemical properties of the porous graphene were tested by the three-electrode method and electrochemical methods such as cyclic voltammetry, constant current charge-discharge and electrochemical impedance. The results show that the prepared 3D porous graphene has a combined structure of micropores and nanopores, and their synergistic effect leads to excellent electrochemical properties of 3D porous graphene, realizing a specific capacitance up to 191.5F/g at the current density of 1A/g.