目的：改善超级电容器用石墨烯薄膜的超电容性能。方法采用水热和高温热解法制备多孔氮掺杂的石墨烯柔性薄膜，采用SEM形貌、XRD图谱和等温曲线分析其结构，采用三电极体系测试循环伏安曲线和恒流充放电曲线，分析其超电容性能。结果氮掺杂石墨烯柔性薄膜保持了氧化石墨烯的褶皱透明，同时具有网络式的多孔洞结构。氮气吸脱附测试表明，氮掺杂多孔石墨烯的比表面积为280.78 m2/g。氮掺杂石墨烯薄膜在1.0 mol/L硫酸钠溶液中，当电流密度为0.1 A/g时，其比容量达到169 F/g。结论氮原子的掺杂以及氮掺杂石墨烯柔性薄膜的多孔结构可以有效提高石墨烯材料的超电容性能。
ABSTRACT:Objective To improve the electrochemical performance of graphene films for supercapacitors. Methods Flexible ni-trogen-doped graphene ( N-doped graphene) films with porous structure were synthesized by hydrothermal and pyrolysis methods. The structure of the N-doped graphene films were analyzed by scanning electron microscope ( SEM) , X-ray diffraction ( XRD) and isotherms. The electrochemical capacitance of N-doped graphene films was examined by three-electrode system test cyclic voltam-metry and galvanostatic charge-discharge methods. Results The experiments indicated that the flexible N-doped graphene films re-tained the folded and transparent characteristics of graphene oxide, and formed a three-dimensional porous structure as well. The surface area of N-doped grapheme was measured to be 280. 78 m2/g by the nitrogen adsorption-desorption test. The specific dis-charge capacitance for the material was 169 F/g in 1. 0 mol/L NaSO4 solution when the current density was 0. 1 A/g. Conclusion The doping of nitrogen atoms and the porous structure of the flexible N-doped graphene films could effectively improve the superca-pacitor performance of the graphene material.
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