期刊
JOURNAL OF POWER SOURCES
卷 369, 期 -, 页码 78-86出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.09.085
关键词
Supercapacitor; MXenes; Nickel foam; Layer by layer self-assemble; Rate performance
资金
- National Natural Science Foundation of China [61774122]
- Science and Technology Developing Project of Shaanxi Province [2015KW-001]
- 111 Project of China [B14040]
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 370 F g(-1), at the scan rate of 2 mV s(-1) and a specific capacitance of 117 F g(-1) is obtained even at the scan rate of 1000 mV s(-1) 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. (C) 2017 Elsevier B.V. All rights reserved.
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