期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 588, 期 -, 页码 847-856出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.11.126
关键词
V2O5; Vertically-aligned carbon nanotubes; Supercritical CO2; Negative electrode; Aqueous asymmetric supercapacitor
资金
- National Natural Science Foundation of China [51702213]
- Science and Technology Commission of Shanghai Municipality [18060502300]
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-07-E00015]
- Medical Engineering Cross Project of USST [10-20-310-402]
A composite electrode with a unique three-dimensional hierarchical nanostructure of V2O5/VACNTs was successfully prepared and applied in aqueous ASCs, showing ideal specific capacitance and outstanding cycling stability.
Development of aqueous asymmetric supercapacitors (ASCs) is often limited by low specific capacitance of negative electrodes. Herein, a composite electrode with tiny vanadium pentoxide (V2O5) nanoparticles homogeneously decorated in vertically-aligned carbon nanotube arrays (VACNTs) is prepared by super-critical CO2 impregnation and subsequent annealing, and used as binder-free negative electrode for aqueous ASCs. Owing to its unique three-dimensional (3D) hierarchical nanostructure, the V2O5/VACNTs (VN) electrodes exhibit an ideal specific capacitance of 284 F g(-1) in the potential range of -1.1 to 0 V vs SCE at 2 A g(-1) and outstanding cycling stability in the Na2SO4 aqueous solution. An aqueous ASC device possessing wide potential range of 1.7 V was constructed with pure VACNTs and VN-350 as the positive and negative electrodes, respectively. The ASC delivers a high energy density of 32.3 Wh kg(-1) at a power density of 118 W kg(-1) and satisfactory cycling life with capacitance retention of 76% after 5000 cycles. (C) 2020 Elsevier Inc. All rights reserved.
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