Enhanced the electrochemical performance of CoMgS nanocomposite electrode with the doping of ZnO for supercapacitor-battery hybrid device and photochemical activity

Supercapattery, an energy harvesting device that combines key characteristics of supercapacitors and rechargeable batteries, has demonstrated excellent electrochemical performance due to its exceptional cycle stability and high power and energy densities. The hydrothermal synthesis of a CoMgS/ZnO composite was performed in this investigation, which enabled the evaluation of its electrochemical and structural properties. The specific capacity of the cobalt magnesium sulphide (CoMgS) nanocomposite electrode material experienced a substantial increase from 510 to 998 C g⁻¹ at 5 mV s⁻¹ when ZnO was added. This improvement resulted from the addition of ZnO, which increased conductivity and enhanced redox active sites. A supercapattery device has demonstrated a remarkable specific capacity of 398 C g⁻¹ at 2 A g⁻¹. Furthermore, it exhibits an exceptional power density of 2653.88 W kg⁻¹ and a noteworthy energy density of 36.18 Wh kg⁻¹. Even after subjecting the hybrid device to 5000 GCD cycles, it retained an impressive 96.84% of its initial capacity. Besides, the electrode material is also used for the photochemical activity. The findings offer substantial guidance for designing electrodes from nanocomposite-related materials for supercapattery, and they also support the stability and functionality of energy storage devices.