期刊
JOURNAL OF POWER SOURCES
卷 300, 期 -, 页码 309-317出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.09.077
关键词
Asymmetric supercapacitor; Biomass; Carbon nanosheets; Manganese dioxide; Composite
资金
- National Natural Science Foundation of China [51572052]
In this paper, MnO2 nanoplates loading on biomass-derived cross-linked carbon nanosheets have been prepared by a two-step synthesis. At first, the cross-linked carbon nanosheets derived from willow catkin are synthesized by one-step pyrolysis and activation method, then the MnO2 anchored cross-linked carbon nanosheets is prepared via in-situ hydrothermal deposition. The asymmetric supercapacitor with terrific energy and power density is assembled by employing the MnO2 anchored cross-linked carbon nanosheets as the positive electrode and the cross-linked carbon nanosheets as the negative electrode in a 1 M Na2SO4 electrolyte. The asymmetric supercapacitor displays a high energy density of 23.6 Wh kg(-1) at a power density of 188.8 W kg(-1) within a wide voltage rage of 0-1.9 V. In addition, the asymmetric supercapacitor exhibits excellent cycling stability with only 1.4% capacitance loss after 10000 cycles at 1 A g(-1). These discoveries open up the prospect of biomass/biowaste derived carbon-based composites for high-voltage asymmetric supercapacitors with superb energy and power density performance. (C) 2015 Elsevier B.V. All rights reserved.
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