Journal
ELECTROCHIMICA ACTA
Volume 283, Issue -, Pages 639-645Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.06.188
Keywords
Tungsten oxide; Nanorods; Oxygen vacancy; High crystallinity; Anode
Categories
Funding
- Guangdong Natural Science Funds for Distinguished Young Scholar [2014A030306048]
- Pearl River S&T Nova Program of Guangzhou [201610010080]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2015TQ01C205]
- Science and Technology Projects of Jiangmen [(2017) 307, (2017) 149]
- Technology Planning Project of Guangdong Province [2015B090927007]
- Fundamental Research Funds for the Central Universities [17lgzd16]
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Asymmetric supercapacitors (ASCs) represent an effective electrochemical energy storage device with wider potential windows, which may lead to a substantial increase in the energy density and power density of the device. Unfortunately, their development is severely restricted by the carbon-based negative electrodes with low energy density. In this work, we demonstrate the facile synthesis of engineering WO3-x electrode on carbon cloth via hydrogenation, which achieves excellent electrochemical performance as a negative electrode for ASCs. The enhanced crystallinity and introduction of oxygen vacancy synergistically contribute to more reversible redox reactions, faster ion diffusion and charge transfer rates. The as-obtained WO3-x electrode reaches a high areal capacitance of 1.83 Fcm(-2) at 1 mAcm(-2), and an outstanding electrochemical durability with high capacity retention of 74.8% after 10000 cycles. All these results open a new way to the construction of high-performance anodes for ASCs. (C) 2018 Elsevier Ltd. All rights reserved.
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