通过简单的两步溶液法对石墨烯进行羧基接枝和表面活性剂修饰,并研究其电化学性能。研究结果表明,与纯石墨烯(比电容50 F/g)相比,表面活性剂本身并不能有效提高石墨烯的比电容(45 F/g),羧基功能化可以将石墨烯的比电容提高至130 F/g。而羧基功能化和表面活性剂修饰双处理工艺能够将石墨烯的比电容提高到230 F/g,且经800次充放电循环后其比电容仍然具有95%的保持率,表明该材料具有良好的循环稳定性。因此,调控石墨烯的表面化学特性对提高其电化学性能具有重要的意义。
Superior capacitance of carboxyl functionalized and surfactant-intercalated graphene were prepared by a relatively simple with two-step solution-based processing technique. In comparison to pristine graphene, surface car-boxyl functionalization and surfactant intercalation can tailor its specific capacitance from 50 F/g to 230 F/g. Mean-while, the modified materials retain more than 95% of their capacitance after 800 charge-discharge cycles, demon-strating good cyclic stability. Surfactant itself cannot improve the performance of pristine graphene as graphene inter-calated with surfactant has a specific capacitance of 45 F/g, however, carboxyl groups can dramatically enhance spe-cific capacitance to 130 F/g. The excellent performance of functionalized graphene emphasizes the importance of con-trolling its surface chemistry.
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