Hydrothermally synthesized highly stable binary manganese magnesium sulfide (MnMgS) composite with carbon nanotubes for high-performance supercapattery applications

The device which combines the outcomes supercapacitor (SC) and battery is known as supercapattery. Due to their high conductivity, sensitivity, and storage capacity, carbon nanotubes have drawn attention in energy storage (EES) applications. To achieve highperformance supercapattery, this study used an electrode based on carbon nanotubes (CNTs) and manganese magnesium sulfide (MnMgS). It showed 963 C/g specific capacity which is significantly greater than the reference sample's value of 1 A/g. The supercapattery is engineered using the CNT-doped MnMgS electrode (MnMgS/CNT//AC), which has a specific capacity (Cs) of 268 Cg-1 at 1 Ag-1 current density. A significantly higher power and energy densities of 2230 WKg-1 and 35.6 Wh/Kg than the previously published graphs is proposed. Moreover, electrochemical impedance spectroscopy (EIS) and BrunauerEmmett-Teller (BET) tests and verify an increase in surface area and conductivity. The device goes through 5000 GCD cycles as part of a reliability test to investigate stability, and it is found that 95% of the claimed capacity is maintained. Our research offers a great foundation for creating high-performing energy storage devices similar to supercapattery.