石墨烯的微波法制备及其电化学电容性能的研究

以天然鳞片石墨为原料,采用改进的Hummers方法制备了氧化石墨,然后通过微波剥离还原氧化石墨制备了石墨烯,并利用红外光谱、扫描电镜和透射电镜对其进行了表征。以所制石墨烯为电极材料、1 mol/L的TEMABF4/PC为电解液制备了超级电容器,并对其电化学性能进行了研究。结果表明:经过微波剥离,氧化石墨的含氧基团已基本完全分解,所得石墨烯为表面具有大量褶皱的薄层。所制电容器具有良好的电容性能,在扫描速度为10 mV/s情况下,其单电极比容量为102 F/g,比能量则高达22.1 Wh/kg。

Microwave synthesis and electrochemical capacitive behaviors of graphene

Graphite oxide(GO) was prepared from natural flake graphite by the modified Hummers method.Graphene was then synthesized by exfoliating and reducing the graphite oxide with microwave,and characterized with FT-IR,SEM and TEM.A supercapacitor was fabricated with the prepared graphene as electrode material and 1 mol/L TEMABF4/PC as electrolyte,and its electrochemical properties were studied.The results show that: after microwave exfoliation and reduction,the oxygen-containing functional groups on graphite oxide are almost completely decomposed.The obtained graphene is lamella with lots of wrinkles.The fabricated supercapacitor shows good electrochemical capacitive behavior.At a scanning rate of 10 mV/s,the specific capacitance of the supercapacitor is about 102 F/g while its specific energy reaches 22.1 Wh/kg.