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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。
The grafted graphene was grafted with carboxyl and the surfactant was modified by a simple two-step solution method and its electrochemical performance was studied. The results show that, compared with pure graphene (specific capacitance 50 F / g), the surfactant itself can not effectively improve the specific capacitance of graphene (45 F / g), carboxyl functionalization can increase the specific capacitance of graphene To 130 F / g. However, the carboxyl functionalization and surfactant modification dual treatment process can increase the specific capacitance of graphene to 230 F / g, and its specific capacitance still retains 95% retention after 800 charge-discharge cycles, indicating that the material has good The cycle stability. Therefore, the regulation of the surface chemical properties of graphene to improve the electrochemical properties of great significance.