Lu Zhiwei, Chen Yujuan, Liu Zhaoen, Li Aoqi, Sun Dong, Zhuo Kelei
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University Xinxiang Henan 453007 P. R. China
RSC Adv. 2018 May 23;8(34):18966-18971. doi: 10.1039/c8ra01715h. eCollection 2018 May 22.
The development of high energy density and power density supercapacitors is very necessary in energy storage and application fields. A key factor of such devices is high-performance electrode materials. In this work, nitrogen and sulfur co-doped graphene aerogels (N/S-GA) were synthesized using graphene oxide as the precursor and 2-mercapto-1-methylimidazole as both the reducing agent and the N/S doping agent. The pore size distribution of the as-prepared N/S-GA was measured and the N/S-GA possesses a hierarchical porous structure. As an electrode material of supercapacitors, the N/S-GA could provide a suitable structure for charge accommodation and a short distance for ion transport. When 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF) ionic liquid was used as the electrolyte, the specific capacitance of the N/S-GA electrode material reached 212 F g and 162 F g at the current densities of 1 A g and 10 A g, respectively. And the energy density and average power density of the N/S-GA based supercapacitor could reach 117 W h kg and 1.0 kW kg at 1 A g, 82 W h kg and 9.5 kW kg at 10 A g, respectively. It is believed that the N/S-GA material can be used in high-performance supercapacitors.
在储能和应用领域，开发高能量密度和功率密度的超级电容器非常必要。此类器件的一个关键因素是高性能电极材料。在这项工作中，以氧化石墨烯为前驱体，2-巯基-1-甲基咪唑作为还原剂和氮/硫掺杂剂，合成了氮硫共掺杂石墨烯气凝胶（N/S-GA）。测量了所制备的N/S-GA的孔径分布，其具有分级多孔结构。作为超级电容器的电极材料，N/S-GA可为电荷容纳提供合适的结构，并为离子传输提供短距离。当使用1-乙基-3-甲基咪唑四氟硼酸盐（[Emim]BF）离子液体作为电解质时，N/S-GA电极材料在电流密度为1 A g和10 A g时的比电容分别达到212 F g和162 F g。基于N/S-GA的超级电容器在1 A g时的能量密度和平均功率密度分别可达117 W h kg和1.0 kW kg，在10 A g时分别为82 W h kg和9.5 kW kg。据信，N/S-GA材料可用于高性能超级电容器。
