Designing an Exfoliated Hexagonal Boron Nitride Nanosheets Embellished on Spherical ZnS as an Efficient Electrode for Hybrid Supercapacitor Applications

Supercapacitors have evolved into a viable solution for confronting issues of energy demand for modern technological world, but its most significant challenge is the construction of novel electrode devices with long‐term energy accumulation. In this current work, exfoliated h‐BN‐ZnS nanocomposites have been efficiently synthesized through an ultrasonication technique. The characterizations of Raman, X‐ray diffraction, and X‐ray photoelectron spectroscopy studies ensure the successful preparation of exfoliated h‐BN‐ZnS nanocomposites. Further, morphology is visualized by field emission scanning electron microscopy and high‐resolution transmission electron microscopy, displaying exfoliated h‐BN nanosheets embellished over a surface of spherical‐shaped ZnS particles. The electrochemical studies of cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge and discharge have been tested in which the exfoliated h‐BN‐ZnS NCs working electrode reveals maximum specific capacity of 919.09 C g −1 at 10 mV s −1 . A hybrid supercapacitor device is constructed by assembling an exfoliated h‐BN‐ZnS and activated carbon as positive and negative electrode, providing an excellent specific capacity of 273.54 C g −1 at 1 A g −1 , and achieving a good energy density of 64.20 Wh kg −1 at the corresponding power density of 844.92 W kg −1 , and showing 94.5% of superior capacity retention at 10 A g −1 of current density over 5000 cycles respectively.