Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7725639 | Journal of Power Sources | 2018 | 11 Pages |
Abstract
Hierarchical nano-micro carbon spheres@rice straw-derived porous carbon composites are successfully synthesized by the in situ decoration of the porous carbon with carbon spheres from glucose under the assistance of cetyltrimethyl ammonium bromide micelles and further activated by KOH. The scanning electron microscope images clearly show the carbon spheres disperse homogeneously and orderly onto the surface and in the inner macropores of the porous carbon. The diameter of the carbon spheres varies from 475â¯nm to 1.6â¯Î¼m, which can be easily controlled by introducing extra inducing agent. The optimal composites exhibit a large specific surface area (1122â¯m2â¯gâ1), rich content of oxygen (14.2â¯wt %), and tunable hierarchical porous structure. When used as supercapacitor electrodes, the novel composites with abundant fruits present a high specific capacitance of 337â¯Fâ¯gâ1 at 1â¯Aâ¯gâ1, excellent rate retention of 83% from 1 to 20â¯Aâ¯gâ1 and a good cycling stability with 96% capacitance retention after 10000 cycles. In this strategy, the thought of shared ion-buffering reservoirs is proposed and the mutual promotion effects between the carbon spheres and porous carbon in the composites are also practically demonstrated to contribute the enhanced electrochemical performances.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Shaobo Liu, Yang Zhao, Baihui Zhang, Hui Xia, Jianfei Zhou, Wenke Xie, Hongjian Li,