Green supercapacitor composed of environmentally friendly materials

Abstract

This publication presents the development of a green supercapacitor, focusing on the creation of an environmentally friendly composite material for electrodes in solid-state devices. The composite material consists of biogenic activated carbon derived from coconut shells and silver nanoparticles synthesized through a green method using Arctium root extract under direct sunlight. The material was characterized using various physicochemical techniques, including UV–Vis spectroscopy, electron microscopy, X-ray diffraction, and BET surface area analysis. The composite electrode material, combined with the Aquivion Na⁺-exchange membrane as both polymer electrolyte and separator, was used to assemble a solid-state supercapacitor. Electrochemical test confirmed the successful integration of silver nanoparticles into the activated carbon matrix, demonstrating high stability and capacitance in the supercapacitor.