Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 897, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115570
Keywords
Supercapacitors; Cobalt disulfide; carbon nanotube composite; One-step hydrothermal method
Categories
Funding
- National Natural Science Founda-tion of China [21606033, 21506086]
- Natural Science Foundation of Liaoning Province [J2020095]
- High-level Scientific Research Foundation [2019RQ055]
- Opening Project of Guangxi Key Laboratory of Clean Pulp &Papermaling and Pollution Control [2019KF30]
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A series of CoS2/CNT composites were prepared and CoS2/CNT-20 exhibited a larger specific capacitance at 0.5 A g-1, satisfactory cycling stability at 3 A g-1, and a high energy density at 749.8 W kg-1, indicating their promising application in energy storage devices.
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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