High-Performance Redox-Active Copper Zinc Sulfides with SWCNTs (SWCNTs/CuZnS) Nanocomposites as an Electrode Materials for Supercapacitors

Abstract

The supercapattery device, a renowned electrochemical energy storage device, is comprised of a supercapacitor and a battery electrode, resulting in remarkable energy and power capability of the fabricated device. These hybrid supercapacitors can overcome the ongoing energy demand as they exhibit high energy (Es) and power (Ps). Therefore, we have synthesized transition metal sulfide by employing the hydrothermal technique, including CuZnS (1:3, 1:1 and 3:1) nanoparticles, single-walled carbon nanotubes (SWCNTs)/CuxZn1-xS) nanocomposites (mixed in 1:3, 1:1, and 3:1 weight percentage ratios) and are tested in three-electrode cell in which the sample SWCNTs/C3Z1S depicts better outcomes. An efficient synthesis was confirmed, and distinctive morphological properties of the materials have been identified employing advanced characterization approaches. Both X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) validated the synthesis mechanism. Notably, we achieved a specific capacitance of 3494.417 Fg-1 at 5 mV/s and 2467.5 Fg-1 at 0.5 Ag-1 . The Asymmetric supercapacitor device (SWCNTs/C3Z1S || AC) has energy and power densities of 66.70 Whkg-1 and 425 Wkg-1 at the current density of 0.5 Ag-1 . The Asymmetric supercapacitor also demonstrated 99.5% Coulombic efficiency and 93.7 % capacity retention over 4000 cycles. Furthermore, the electrode material comprising (SWCNTs/C3Z1S) shows significant potential for advanced supercapacitor technology.