Influence of temperature on the redox behaviour of binder-free CNTs-NiZnS electrode and the application in efficient energy storage devices

Abstract

Due to their unique structure, the metal sulfides are mechanically stable, have higher conductivities, and are frequently used in energy storage devices. Here, binder-free electrodes were designed by depositing the nickel zinc sulfide (NiZnS) incorporated with carbon nanotubes (CNTs) on the nickel foam (NF). X-ray diffraction (XRD) was used to describe the crystallinity of produced CNTs-NiZnS nanostructures, and morphological investigations were performed using field emission scanning electron microscopy (FESEM). According to the electrochemical measurements, the heating of electrolyte at 80 °C resulted in considerably enhanced specific capacitance of 1475 Cg-1 (50.85 F/m2) and 666 Cg-1 (13.77 F/m2) at 1 and 2 Ag-1 current density, correspondingly. Thus demonstrating a good capacity retention of 47% at 2 Ag-1. The supercapattery (CNTs-NiZnS//AC) was designed with CNTs-NiZnS and AC, providing a specific charge capacity of 212 Cg-1 (at 2.0 Ag-1) along with energy density of 51 Wh-kg-1 at 820 W-kg-1 power density. The stability of CNTs-NiZnS//AC was tested by subjecting it to 5000 successive cycles.

A bimetallic Fe–Mg MOF with a dual role as an electrode in asymmetric supercapacitors and an efficient electrocatalyst for hydrogen evolution reaction (HER)

“…This knowledge is important in determining the suitability and effectiveness of the material. 35 The MFM shows characteristics of capacitive behaviour, leading to the absence of the material reduction peak commonly observed in the literature. 36,37 The presence of MFM nanoparticles in large quantities hindered their involvement in the crystallization process of MFM.…”

Review and Outlook of Zinc Sulfide Nanostructures for Supercapacitors

“…The study found that a temperature of 80 °C increased specific capacitance values, and the supercapattery, composed of CNTs-NiZnS and activated carbon, demonstrated high specific charge capacity and energy density. 185 Awais et al 186 used a hydrothermal technique for preparing ZnS, CoSe 2 , and nanohybrid groupings for a supercapacitor device. The research revealed a cubic crystal structure of ZnS and a smooth, transparent surface of CoSe 2 .…”

“…At 80, 50, and 30 °C the BET surface area of CNTs-NiZnS was 48.34 m 2 /g, 36.64 m 2 /g, and 28.14 m 2 /g. The study found that a temperature of 80 °C increased specific capacitance values, and the supercapattery, composed of CNTs-NiZnS and activated carbon, demonstrated high specific charge capacity and energy density …”