Multi-walled carbon nanotube decorated CoS microspheres and their supercapacitive properties

Abstract

In the present work, microspheres of CoS are synthesized by most adoptable hydrothermal method. The syn-thesized material is figured out by numerous characteristic techniques. Further, the prepared CoS material is used as electrode material for supercapacitor and high specific capacity of 112.62 mAh g-1 is obtained at 1 A g-1. Furthermore, the capacity of sole product is boosted by adding a small amount of multi-walled carbon nanotubes (MWCNTs) and improved specific capacity of 158 mAh g-1 is obtained from MWCNT/CoS at 1 A g-1. Owing to high specific capacity of composite, aqueous asymmetric supercapacitor (ASC) is designed by MWCNT/CoS as a positive electrode and activated carbon (AC) as a negative electrode. The high energy density of 31.6 W h kg-1 is obtained at the power density of 750 Wh kg-1 from MWCNT/CoS//AC. In addition, two parallel connected red color LEDs, kitchen timer and a motor fan are functionalized by two MWCNT/CoS//AC devices.