Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5148669 | Journal of Power Sources | 2017 | 9 Pages |
Abstract
Supercapacitor, as an important energy storage device, is a critical component for next generation electric power system, due to its high power density and long cycle life. In this study, a novel electrode material with quasi-core-shell structure, consisting of negatively charged few layer Ti3C2 nanosheets (FL-Ti3C2) and positively charged polyethyleneimine as building blocks, has been prepared by using an electrostatic layer-by-layer self-assembly method, with highly conductive Ni foam to be used as the skeleton. The unique quasi-core-shell structured ultrathin Ti3C2 nanosheets provide an excellent electron channel, ion transport channel and large effective contact area, thus leading to a great improvement in electrochemical performance of the material. The specific capacitance of the binder-free FL-Ti3C2@Ni foam electrodes reaches 370Â FÂ gâ1 at the scan rate of 2Â mVÂ sâ1 and a specific capacitance of 117Â FÂ gâ1 is obtained even at the scan rate of 1000Â mVÂ sâ1 in the electrolyte of Li2SO4, indicating a high rate performance. In addition, this electrode shows a long-term cyclic stability with a loss of only 13.7% after 10,000 circles. Furthermore, quantitative analysis has been conducted to ensure the relationship between the capacitive contribution and the rate performance of the as-fabricated electrode.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yapeng Tian, Chenhui Yang, Wenxiu Que, Yucheng He, Xiaobin Liu, Yangyang Luo, Xingtian Yin, Ling Bing Kong,