V2O5/vertically-aligned carbon nanotubes as negative electrode for asymmetric supercapacitor in neutral aqueous electrolyte
Journal of Colloid and Interface Science(2021)
摘要
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 supercritical 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.
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关键词
V2O5,Vertically-aligned carbon nanotubes,Supercritical CO2,Negative electrode,Aqueous asymmetric supercapacitor
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