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通过改进的Hummer法制得氧化石墨烯,并在不同温度的氩气气氛中还原得到一系列热还原氧化石墨烯(T-RGO).电化学测试表明,T-RGO作为超级电容器电极材料时,良好的导电性是必需的,但石墨烯表面含氧官能团对其电容性能的影响要远大于导电性和比表面积的影响.900oC还原的T-RGO比表面积为314 m2·g-1,电导率为2421 S·m-1,但其容量只有56 F·g-1.而300 oC还原的T-RGO比表面积为18.8 m2·g-1,电导率为574 S·m-1,其容量却达到281 F·g-1.材料表征分析表明,300 oC还原的石墨烯之所以有更高的电容,是因为除双电层电容外,更多的是由其表面含氧官能团提供的赝电容,这使作者以后在设计制备超级电容器等储能设备用石墨烯基电极材料时更加有针对性.
A series of thermally reduced graphene oxide (T-RGO) were obtained by the modified Hummer method and electrochemical reduction of the graphene oxide under different temperatures in an argon atmosphere.The electrochemical tests showed that the T-RGO was excellent as an electrode material of the supercapacitor The conductivity of graphene surface oxygen-containing functional groups is far greater than the conductivity and surface area of the specific surface area of the T-RGO reduction of 900oC reduction of 314 m2 · g-1, the conductivity of 2421 S · m-1, but its capacity was only 56 F · g-1. The specific surface area of T-RGO reduced by 300 oC was 18.8 m2 · g-1 and the conductivity was 574 S · m-1, 281 F · g-1. Characterization of the material shows that the reason why the 300 ° C reduced graphene has a higher capacitance is that in addition to the electric double layer capacitance, more is provided by the surface of the oxygen-containing functional pseudocapacitance, This allows the author later in the design and preparation of supercapacitors and other storage devices with graphene-based electrode materials more targeted.