Highly scalable and low cost binder free electrode of Zinc modified NiO nanofoam for dual role of supercapacitor and its free radical scavenging activity

In this study, pristine nickel oxide (NiO) and Zinc modified NiO nanofoams were prepared by green approach using camellia sinensis leaves extract. Pristine nickel oxide and Zn²⁺ modified NiO nanofoam were characterized by XRD, FTIR, FL, UV and FESEM. FE-SEM micrographs were clearly shows that the synthesised porous nanofoam with spherical shaped were constant distribution. The as prepared foam electrodes showed excellent supercapacitive behaviour with increase in specific capacitance with decrease in scan rate. The maximum specific capacitance 1530, 1706 and 1847Fg^-1 was obtained at scan rate of 10 mVs^-1 for increasing the Zn concentrations. After 3,000 cycles at 1 A g^?1, the cyclic stability remains excellent at 88.1% of the initial capacitance. Moreover, the as-prepared asymmetric supercapacitor exhibits a high energy density of 30.6 W h·kg^?1 at power density of 398 W kg^?1. This study is expected to provide new insights into exploring the potential mechanism of catalyst action. These findings show that Zinc @ NiO nanofoam could be a potentially useful electrode material for energy storage devices.