Facile synthesis of cobalt Disulfide/Carbon nanotube composite as High-performance supercapacitors electrode
Journal of Electroanalytical Chemistry(2021)
摘要
Transition metal sulfides are widely used in energy conversion and storage devices due to their distinguished electrochemical activity. In particular, cobalt disulfide (CoS2) shows potential as a good electrode material owing to its low cost and good stability. Here, a series of CoS2/CNT composites with different contents of carbon nanotubes (CNTs) was prepared through a one-step hydrothermal method and used as electrode materials for asymmetric supercapacitors. Their electrochemical performance was also studied. Results show that compared with other composite materials, CoS2/CNT-20 exhibited a larger specific capacitance of 823F g−1 at 0.5 A g−1, satisfactory cycling stability of 93.86% capacitance retention after 7000 cycles at 3 A g−1, and a high energy density of 27.7 Wh kg−1 at the power density of 749.8 W kg−1. These findings imply their promising application in energy storage devices.
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关键词
Supercapacitors,Cobalt disulfide/carbon nanotube composite,One-step hydrothermal method
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