影响热还原氧化石墨烯超级电容器性能的因素比较（英文）  

Comparison in Factors Affecting Electrochemical Properties of Thermal-Reduced Graphene Oxide for Supercapacitors

作　　者：肖鹏[1,2] 王大辉[1] 郎俊伟[2] 

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]中国科学院兰州化学物理研究所,清洁能源化学与材料实验室,甘肃兰州730000

出　　处：《电化学》2014年第6期553-562,共10页Journal of Electrochemistry

基　　金：supported by The Top Hundred Talents Program of the Chinese Academy of Sciences;National Natural Science Foundations of China(No.51005225,No.21203223)

摘　　要：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.In this paper, thermal-reduced graphene oxide （T-RGO） materials are synthesized by modified Hummer＇s method, followed by thermal reduction under argon atmosphere at different temperatures. Electrochemical investigations show that, for T-RGO electrodes, good electrical conductivity is necessary and the surface functional groups play more significant role than the specific surface area in determining the electrochemical capacitance. The T-RGO obtained at 900 ℃ （T-RGO900） with a relatively high Brunauer-Emmett-Teller （BET） surface area （314 m^2·g^-1） and a high electrical conductivity （2421 S·m^-1） shows a low specific capacitance of 56 F·g^-1. In comparison, the T-RGO obtained at 300℃（T-RGO300） with a relatively low BET surface area （18.8 m^2·g^-1） and an electrical conductivity （574 S·m^-1） provides the largest specific capacitance of 281 F·g^-1. The large specific capacitance of T-RGO30o results fi＇om the simultaneous contributions of the electrochemical double-layer capacitance and the pseudo-capacitance obtained from the oxygenated groups on the T-RGO surfaces. Therefore, it probably gives a new insight for designing and synthesizing graphene-based electrode materials for supercapacitors and other energy-storage devices.

关 键 词：石墨烯 赝电容 超级电容器 表面官能团 热还原 

分 类 号：TM53[电气工程—电器] O613.71[理学—无机化学]