期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 818, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152895
关键词
Vanadium nitride/Carbon; Supercapacitors; Electrode materials; Long cycle life
资金
- Open Fund of the Key Laboratory of Xinjiang Uygur Autonomous Region [2017D04014]
- National Natural Science Foundation of China [U1703251, 21571152]
- Program for Tianshan Innovative Research Team of Xinjiang Uygur Autonomous Region [2018D14002]
- Scientific Research Program of the Higher Education Institution of Xinjiang [XJEDU2017A001]
Vanadium nitride is highly desirable for their good electrochemical performance and wide work potential window, but they are cramped practical applications in supercapacitors due to poor cycling stability. Herein a combined strategy is exploited to fabricate coralloid-like nanostructure vanadium nitride/carbon (VN/C) via a facile hydrothermal method. The structural characterization displayed that nano-VN was uniformly distributed in the carbon scaffold materials to improve the electrode behavior. Those composites exhibited a wide voltage window of -1.1 to 0 V with a specific capacitance of 385 F g(-1) at 1 A g(-1), and exceptional cycling stability (88.9% retention after 10000 cycles). The two-electrode system based on VN/C electrodes obtains a high energy density of 24.2 Wh kg(-1) at a power density of 1050 W kg(-1). The device also shows perfect cycling stability with 93.3% capacitance retention after 10000 cycles. The coralloid-like VN/C electrode materials can be used in practical applications of the high-performance energy storage device. (C) 2019 Elsevier B.V. All rights reserved.
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