Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5149017 | Journal of Power Sources | 2017 | 8 Pages |
Abstract
A generalised approach to the preparation of nitrogen-containing porous carbon from cellulose for supercapacitor applications is demonstrated in this paper. A sample prepared at a carbonisation temperature of 600 °C with a specific surface area of 781 m2 gâ1 and a pore volume of 0.68 cm3 gâ1 displayed the best electrocapacitive performance. The well-developed porous structure coupled with the presence of nitrogen-containing functional groups along with nascent hydrogen enabled this sample to exhibit specific capacitances of 248 and 133 F gâ1 at current densities of 0.1 and 10 A gâ1, respectively, in a symmetric cell with 1 M aqueous H2SO4 solution as the electrolyte. With this electrode, about 89% of the initial capacitance is retained after 2000 cycles at a current density of 1 A gâ1. A symmetric supercapacitor fabricated using this carbon in both electrodes exhibits an energy density of 14.6 Wh Kgâ1 at a power density of 63.5 W Kgâ1 and remains at 7.9 Wh Kgâ1 at a power density of 6500 W Kgâ1.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Hao Lu, Xiaoming Sun, Rohit R. Gaddam, Nanjundan A. Kumar, Xiu Song Zhao,