State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510641, PR China.
Analytical and Testing Center of South China University of Technology, South China University of Technology, Guangzhou, 510641, PR China.
Carbohydr Polym. 2019 Mar 1;207:764-774. doi: 10.1016/j.carbpol.2018.12.048. Epub 2018 Dec 17.
Although a few methods have been employed to fabricate N-doped porous carbons from various N-containing biomass resources, it is still a big challenge to obtain porous carbons with high supercapacitance performances. Herein, we demonstrate that aN-doped porous carbon with superior supercapacitance can be prepared from chitosan by properly controlling hydrothermal carbonization (HC). The physicochemical and supercapacitance properties of the HC-derived carbon are highly time-dependent and can be readily tailored. As compared with traditional direct pyrolysis, the proper control of HC time plays a very important role in promoting the supercapacitance performances of the N-doped carbon by increasing turbostratic structure, doped N content and active N species, specific surface area, and especially balancing micro- and mesoporosity. These synergistic effects produce a N-doped carbon with an ultrahigh specific capacitance of 406 ± 36 F g in a three-electrode system, outstanding rate capability, and ultrahigh energy density (23.6 ± 3.1 W h kg).
虽然已经有一些方法被用于从各种含氮生物质资源中制造 N 掺杂多孔碳，但要获得具有高超级电容性能的多孔碳仍然是一个巨大的挑战。本文中，我们证明了一种氮掺杂多孔碳可以通过适当控制水热碳化（HC）从壳聚糖制备得到，具有优异的超级电容性能。HC 衍生碳的物理化学和超级电容性能高度依赖时间，并且可以轻松地进行调整。与传统的直接热解相比，适当控制 HC 时间对于通过增加乱层结构、掺杂 N 含量和活性 N 物种、比表面积，特别是平衡微孔和介孔来促进氮掺杂碳的超级电容性能起着非常重要的作用。这些协同效应产生了一种氮掺杂碳，在三电极系统中具有超高的比电容（406 ± 36 F/g），出色的倍率性能和超高的能量密度（23.6 ± 3.1 Wh/kg）。
