Fabrication of asymmetric supercapacitor device with NiCo2O4@Graphene nanoplatelets nanocomposites

Supercapacitors have collected considerable attention in the last couple of decades and so the exploration of electrode material for supercapacitors has become an essential element. In this work, spinel-like nickel cobalt oxide (NiCo2O4) has been prepared through a facile and low-cost co-precipitation method. To boost the electrochemical characteristics of. NiCo2O4, the material is incorporated into graphene nanoplatelets to form a nanocomposite. The XRD pattern and SEM micrographs confirmed the formation of nanocomposite. The GCD results indicates the two-fold better electrochemical performance of NiCo2O4@graphene nanocomposite as compared to pristine - NiCo2O4 with the superior specific capacity value of 340.87C g(-1) corresponding to current density of 1.0 A/g and 253.2C g(-1) at a current density of 10.0 A/g. The practical utility of the material is showcased through the fabrication of an asymmetric supercapacitor (ASC) as NiCo2O4@GNP//AC device. The fabricated device exhibits 68.84 Wh Kg(-1) energy density and 3125 W Kg(-1) power density corresponding to 20.0 A/g current density. Furthermore, a couple of arrays of LED lights designed as NITK and KUK were illuminated for 2 min and 6 min respectively with bright intensity. Additionally, a toy fan was also run for ten seconds. The work thus presents a great potential for NiCo2O4@graphene nanocomposite material in energy storage applications.