Effect of temperature on redox active sites in sulfide based nanorods composites electrode material in a hybrid supercapacitor for energy storage and biomedical applications

Abstract

Bimetallic sulfide based electrode materials have attained a lot of interest because of high chemical activity, large conductivity and porous structure. This work effectively described the impact of temperature on the specific capacity of electrode materials and is successfully used to study biomedical applications by detecting hydrogen peroxide. The high oxidation-reduction reactions and conductivity of transition metal-based electrode materials have been recognized as being advantageous for supercapacitor (SC) electrodes; however, the temperature-dependent behavior of CoMgS-based electrodes is not yet fully understood. To address this knowledge gap, CoMgS electrodes were prepared using hydrothermal process, and their electrochemical performance was characterized at various temperatures (0–55 °C). Notably, the CoMgS-based electrode materials exhibited excellent electrochemical performance at 55 °C, displaying a specific capacity (Cs) of 900.0C/g at 10 mV/s using a three-electrode system. Moreover, the CoMgS and activated carbon-based hybrid device demonstrated remarkable Cs of 293.6C/g at the temperature of 55 °C with attractive energy and power densities of 30.6 Wh/kg, and 5183 W/kg, respectively. Even after undergoing 5000 cycles, the CoMgS//AC device exhibited a capacity retention (CR) rate of 85 %, indicating its exceptional durability as an energy storage solution. Besides, the composite devices are used to detect hydrogen peroxide which exists in enough amounts in cancerous cells. Overall, the findings of this work indicate that CoMgS electrode capacitance may be increased at an optimal temperature, probably as a result of better ion diffusion and charge transfer kinetics, to improve the efficiency of the energy storage device and be utilized to identify the cancerous part in the body.