Xiao Yingbo, Huang Jun, Xu Yazhou, Yuan Kai, Chen Yiwang
College of Chemistry/Institute of Polymers and Energy Chemistry , Nanchang University , 999 Xuefu Avenue , Nanchang 330031 , China.
ACS Appl Mater Interfaces. 2019 Jun 5;11(22):20029-20036. doi: 10.1021/acsami.9b04393. Epub 2019 May 22.
Porous carbon materials are the most commonly used electrode materials for supercapacitors because of their abundant structures, excellent conductivities, and chemical stability. However, the manufacture of carbon materials possessing sizable pores and remarkable wettability with the electrolyte remains challenging. Herein, we developed a facile and industrially scalable method for the production of nitrogen-doped porous carbon nanosheets (PNDC-4) with excellent pore size distribution, large specific surface area (>1200 m g), high conductivity (>700 S m), and superb wettability either in aqueous or organic electrolyte. Particularly, PNDC-4 shows a high capacitance of 387 F g (1 A g) in a three-electrode system with 3 M KOH and 80 F g (1 A g) in a symmetric two-electrode system with EMIMBF. The device exhibits an ultrahigh energy density of 81 W h kg at a power density of 1.3 kW kg and can still maintain at 60.8 W h kg when the power density is increased to 266.6 kW kg. Moreover, the devices show superb stability that 94% of its initial capacitance is still maintained after 100 000 cycles at 20 A g.
多孔碳材料因其丰富的结构、优异的导电性和化学稳定性，是超级电容器中最常用的电极材料。然而，制备具有大尺寸孔隙且与电解质具有显著润湿性的碳材料仍然具有挑战性。在此，我们开发了一种简便且可工业规模放大的方法来制备氮掺杂多孔碳纳米片（PNDC-4），其具有优异的孔径分布、大比表面积（>1200 m²/g）、高电导率（>700 S/m），并且在水性或有机电解质中均具有出色的润湿性。特别地，PNDC-4在含有3 M KOH的三电极体系中表现出387 F/g（1 A/g）的高电容，在含有EMIMBF的对称两电极体系中表现出80 F/g（1 A/g）的电容。该器件在功率密度为1.3 kW/kg时展现出81 W h/kg的超高能量密度，当功率密度增加到266.6 kW/kg时仍能保持在60.8 W h/kg。此外，该器件表现出卓越的稳定性，在20 A/g下经过100000次循环后仍能保持其初始电容的94%。
