Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4767639 | Electrochimica Acta | 2016 | 35 Pages |
Abstract
Three dimensional nitrogen-doped graphene (3DNG) with high nitrogen content and improved electrochemical performance is successfully prepared by a facile, lost-cost hydrothermal method with ammonia as reducing-doping agent. The as-prepared 3DNG exhibits a hierarchical and interconnected porous network, which offers favorable pathways for electrolyte penetration and transportation. Remarkably, as binder-free electrode in aqueous electrolyte, the resultant 3DNG-2 with both high nitrogen content (7.71 at%) and large active material density (1.31 g cmâ3) exhibits an ultrahigh volumetric capacitance of 437.5 F cmâ3 (334.0 F gâ1) at current density of 0.5 A gâ1 and superior cycling stability (93% capacitance retention after 20 000 cycles at high current density of 10 A gâ1). Further analyses indicate that the N-configurations are of great significance to the improvement of electrochemical behavior as well as the N-content. This work provides an effective way to synthesize 3DNG with excellent electrochemical properties for high performance supercapacitor and promotes the in-depth understanding of the enhancement mechanism of N-doping to supercapacitor performance.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Xiao Zhao, Hanwu Dong, Yong Xiao, Hang Hu, Yijin Cai, Yeru Liang, Luyi Sun, Yingliang Liu, Mingtao Zheng,