期刊
NANO LETTERS
卷 13, 期 6, 页码 2628-2633出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl400760a
关键词
Asymmetric supercapacitors; nanowires; vanadium nitride; anode
类别
资金
- U.S. NSF [DMR-0847786]
- UCSC faculty startup funds
- National Center for Electron Microscopy at Lawrence Berkeley National Laboratory
- U.S. Department of Energy [DE-AC02-05CH11231]
- Natural Science Foundations of China [90923008, 21273290, J1103305]
- Research Fund for the Doctoral Program of Higher Education of China [20120171110043]
- Academic New Artist Ministry of Education Doctoral Post Graduate (China)
To push the energy density limit of asymmetric supercapacitors (ASCs), a new class of anode materials is needed. Vanadium nitride (VN), holds great promise as anode material for ASCs due to its large specific capacitance, high electrical conductivity, and wide operation windows in negative potential. However, its poor electrochemical stability severely limits its application in SCs. In this work, we demonstrated high energy density, stable, quasi-solid-state, ASC device based on porous VN nanowire anode and VOx nanowire cathode for the first time. The VOx//VN-ASC device exhibited a stable electrochemical window of 1.8 V and excellent cycling stability with only 12.5% decrease of capacitance after 10000 cycles. More importantly, the VOx//VN-ASC device achieved a high energy density of 0.61 mWh cm(-3) at current density of 0.5 mA cm(-2) and a high power density of 0.85 W cm(-3) at current density of 5 mA cm(-2). These values are substantially enhanced compared to most of the reported quasi/all-solid-state SC devices. This work constitutes the first demonstration of using VN nanowires as high energy anode, which could potentially improve the performance of energy storage devices.
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