Redox-active anomalous electrochemical performance of mesoporous nickel manganese sulfide nanomaterial as an anode material for supercapattery devices

In this work, we are reporting nickel manganese sulfide hierarchical redox-active nanostructured material synthesized using a facile one-step hydrothermal technique to investigate its potential for supercapattery devices. The surface morphology, crystallinity, elemental analysis/composition surface area, porosity, and homogeneity were investigated through X-ray diffraction (XRD), Energy dispersive X-ray (EDX) spectra, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET). The electro-chemical characterizations were performed in a three-electrode standard cell whereas the electrolyte used was 1 M potassium hydroxide. These characterizations predict that sample S-0.4 is exhibiting superior performance over all other electrodes and therefore it was paired with activated carbon for the assembling of supercapattery (Ni-Mn-S//AC). This supercapattery was probed electrochemically with CV, GCD, EIS, and stability tests which reveals superb performance by delivering a high value of capacity (420.10 C/g) with a maximum energy density of 75.96 Wh/kg. The device was able to deliver the power density of 2865 W/kg, along with an outstanding cyclic life by sustaining 85% of capacity even after 5000 GCD cycles. Our analysis for this electrode material suggests that our synthesized material can be applied for future high-performance supercapattery devices.

Automated summary

In this study, nickel manganese sulfide hierarchical redox-active nanostructured material was synthesized and characterized. Electro-chemical characterizations showed that sample S-0.4 exhibited the best performance and when paired with activated carbon, it showed high capacity and energy density, as well as excellent cyclic life. The analysis suggests that this material has potential for future high-performance supercapattery devices.