微波膨化法制备石墨烯及其电容性能研究

Preparation of graphene by microwave bulking and research of its capacitance performance

以天然石墨(NG)为原料,采用先插层后微波处理的方法制备石墨烯。实验结果表明:随着KMnO_4用量和微波时间的增加,获得的石墨烯表面为褶皱的薄层结构;比表面积呈现先增加后减小的趋势,当KMnO_4与NG的质量比为0.9,微波时间为60 s时,比表面积最大,为313 m^2/g。在6 mol/L的KOH溶液中,石墨烯的比电容随着KMnO_4用量和微波时间的增加,呈现先增加后减小的趋势,当KMnO_4与NG质量比为0.9,微波时间为60 s时,放电比电容最大,为98F/g。这表明比表面积与电容性能具有相关性,较大的比表面积有助于提高石墨烯的比电容。

With the natural graphite（NG） as raw material, the graphene was prepared by the method of graphite intercalation and then microwave. The experiment results show that with the increase of KMnO_4 and microwave time,the layer surface of the obtained graphene is plicate and thin; the specific surface area increases at first and then decreases. When the mass ratio of KMnO_4 and NG is 0.9 and microwave time is 60 s, the largest specific surface area is 313 m^2/g. In the 6 mol/L KOH solution,the specific capacitance increases at first and then decreases,with the increase of KMnO_4 and microwave time. When the mass ratio of KMnO_4 and NG is 0.9 and microwave time is 60 s,the highest discharge specific capacitance is 98 F/g. This indicates that the specific surface area and specific capacitance have correlation, and the larger specific surface area is good for enhancing specific capacitance of graphene.