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 synthesized 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.