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电化学  2014 

影响热还原氧化石墨烯超级电容器性能的因素比较

DOI: 10.13208/j.electrochem.140213, PP. 553-562

Keywords: 石墨烯,赝电容,超级电容器,表面官能团,热还原

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Abstract:

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,900°C还原的T-RGO比表面积为314m2·g-1电导率为2421S·m-1,但其容量只有56F·g-1,然而300°C还原的T-RGO比表面积为18.8m2·g-1电导率为574S·m-1,其容量却达到281F·g-1.材料表征分析表明,300°C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.

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