Morphological engineering of quaternary mixed metal sulfide CuMnZnS electrodes for high-performance hybrid energy storage device

Abstract

Hybrid supercapacitor (HSC) devices are unceasingly gaining enormous attention from researchers and industries due to low cost, easy fabrication, efficient performance, and demands in various high-tech applications. To accomplish superior device performance, the design and improvement of suitable cathode material, and the upgradation of the existing ones is a crucial and challenging task. However, in this context, the discovery of novel mixed metal sulfides with different morphologies is a good choice. Herein, the present study investigates the influence of systematic variation in hydrothermal reaction time on the CuMnZnS@NF film growth and fine-tuning of morphology for HSC device application. The CuMnZnS@NF electrodes deposited at 36 hour hydrothermal reaction time show exceptional capacitance of 9.56 F cm−2, at 17.25 mA cm−2. Unique electrochemical performance can be credited to a porous network of flex that offers large numbers of electroactive sites which shorten ion-diffusion length and boost energy storage performance. Further, fabricated HSC devices exhibit a superior power density (PD) of 2.555 mW cm−2, remarkable energy density (ED) of 0.120 mWh cm−2, and excellent CA of 300 mF cm−2. The 87 % capacity retained after 5000 GCD cycles demonstrates HSC device can be used for various potential applications. Finally, this attempt reinforces the ongoing discovery and development of novel positive electrodes to accomplish swelling renewable energy demands. © 2024 Elsevier Ltd