Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 50, Issue 5, Pages 2879-2889Publisher
SPRINGER
DOI: 10.1007/s11664-021-08796-w
Keywords
Activated carbon; carbon nanotubes; supercapacitor; cyclic voltammetry; galvanostatic charge-discharge
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Funding
- Ministry of Human Resource Development (MHRD), Government of India
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The composite of activated carbon and functionalised multiwalled carbon nanotubes was prepared using a simple and cost-effective method, showing high specific capacitance, power, and energy density, as well as long-term cycling stability in supercapacitor applications.
We prepared a composite using activated carbon and functionalised multiwalled carbon nanotubes by a simple and cost-effective process and investigated its use for supercapacitor application. The electrochemical performance of the prepared composite has been investigated by galvanostatic charge-discharge (GCD) and cyclic voltammetry (CV) measurements in a three-electrode set-up. The composite resulted in maximum specific capacitance of 395 F/g at 5 mV/s as measured by CV, and of 372 F/g at 60 A/g by GCD measurement in 3M KOH aqueous electrolyte. High power and energy density of 75.27 kW/kg and 25.31 W center dot h/kg at 60 A/g have been respectively obtained for composite using GCD measurement. The long-term charge-discharge stability has been performed for the composite electrodes, and it is observed that 89% of capacitance is retained even after 5000 cycles. The achieved results suggest that the prepared activated carbon/multiwalled carbon nanotube composite can be a potential electrode material in high-performance supercapacitors for energy storage applications. Graphic abstract
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