Harnessing biochar based metal halide (KCuCl3) for highly efficient energy storage application

Abstract

Supercapacitors, as advanced energy storage systems, are pivotal in addressing modern energy demands, offering rapid energy storage and delivery with high efficiency. In this study, we present a novel, cost-effective nanocomposite electrode material combining porous biochar with KCuCl₃ metal halide perovskite, designed to enhance capacitive performance through superior redox potential. This composite demonstrates outstanding electrochemical properties in 2 M KOH, achieving a capacitance of 1333.08 F/g, a power density of 2.522 kW/kg, and an energy density of 109.11 kWh/kg. With a high BET specific surface area of 14.3 m²/g, biochar-KCuCl₃ material provides extensive active sites, facilitating efficient ion diffusion and charge storage. The composite exhibits a C_dl of 24.15 μF/cm², a low charge transfer resistance (Rct) of 0.0387 Ω, and an electrochemical surface area of 261.2 cm², underscoring its high-performance capabilities. The biochar matrix, noted for its large surface area and excellent adsorption properties, optimizes ion accessibility, making this biochar-KCuCl₃ nanocomposite a promising candidate for sustainable, high-efficiency supercapacitors poised to revolutionize energy storage solutions.