Development of High‐Performance Asymmetric (CuO//AC) Device in Supercapacitor Application

This research describes a sustainable approach to the synthesis of copper oxide (CuO) nanostructures by using Aloe vera as a green reducing agent, with the aim of their use in asymmetric supercapacitor configurations. CuO nanoparticles were synthesized in the alkaline environment (pH 12) and the as‐synthesized nanostructures were characterized using different techniques such as field emission scanning electron microscopy (FE‐SEM), X‐ray diffraction, UV–Vis, fourier transform infrared (FTIR) spectroscopy, brunauer‐emmett‐teller (BET) surface area measurements, and electrochemical techniques such as galvanostatic charging‐discharging, electrochemical impedance spectroscopy, and cyclic‐voltammetry (CV) for the analysis of their structure, morphology, and optical and electrochemical properties. The results revealed the successful fabrication of CuO nanoparticles with uniform morphology and a porous architecture with a high specific surface area of 19.6 m 2 g −1 , which contributed to acapacitance of 280 F g −1 at 1 mV s −1 sweep rate. The as‐fabricated asymmetric device (CuO//AC) exhibited excellent performance, with a capacitance of 112 F g −1 at a scan rate of 1 mV s −1 . After 10 000 CV cycles at 200 mV s −1 , it retained 78.2% of its original capacitance, indicating prolonged functional reliability. These findings demonstrate that synthesizing CuO nanoparticles using Aloe vera is an environmentally friendly and sustainable strategies, exhibit excellent supercapacitor performance, indicating good candidate for use in ecofriendly energy storage applications.