Abstract
Mixed transition metallic sulfides have attracted researchers' attention due to their unique electronic and electrochemical properties for energy storage devices. Herein, we have investigated nickel manganese sulfides (Ni-x-Mn-x-S) based binary anode material for supercapattery devices. The hydrothermal method was used to synthesize the Ni-x-Mn-x-S-based nanomaterials with different Ni to Mn ratios. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray (EDX), and Brunauer-Emmett-Teller spectroscopy (BETS) is used to examine surface characteristics, crystallinity, elemental analysis, and homogeneity. The electrochemical measurement of the Ni-x-Mn-x-S-based electrode material is first explored in three electrodes assembly while maintaining a 1 M KOH electrolyte environment. Among all the electrodes, Ni0.50Mn0.50 S demonstrated exceptional performance with a specific capacity of 713 C/g or 1188 F/g at the current density of 1.0 A/g. Lastly, the Ni0.50Mn0.50 S based nanomaterials are used as working electrode and activated carbon (AC) as reference electrode for the two electrodes assembly test (Ni-0.50 Mn-0.50 S//AC). Which showing a high energy density of 35.24 (Wh/Kg), power density of 3200 (W/Kg), extraordinary specific capacity 158.6 C/g with coulomb efficiency 91.6% and capacity retention 70% after 11,000 galvanostatic charging/discharging (GCD) cycles. Our findings provide a platform to improve the performance of asymmetric energy storage devices.
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