Synthesis & Characterization of NiAl-LDH@NiCoSe2 Nanocomposite for Supercapacitor Applications

Abstract

Advanced energy storage solutions just like supercapacitors (SCs) have been developed to meet the increasing energy demands of the modern world. Hybrid metal chalcogenides have drawn considerable interest as electrode active materials for their application in supercapacitors, owing to their rich redox chemistry, layered structure, fast ion diffusion properties, various oxidation states, and versatile morphology. In this study, we have demonstrated the synthesis of NiCoSe2 hybrid nanocomposite with the different variation of NiAl-LDH nanosheets by using hydrothermal synthesis route for the first time with desirable structure and then employed NAL@NCS as the best ratio composite electrode for supercapacitor application. NAL@NCS hybrid nanocomposite grown on a Ni-foam displayed a high specific capacitance 1092 F g-1 at a current density 0.5 A g-1 . The study further delved into the reaction mechanism through XRD, FTIR, and SEM. A larger surface area facilitated the penetration of charges in the nanosheets to enhance the electrochemical properties. In addition, the NAL@NCS was used as a positive electrode with activated carbon (AC) as a negative electrode to construct the asymmetric supercapacitor device. Due to the synergetic effect, the NAL@NCS||AC device demonstrated a specific capacitance of 674 F g-1 at the current density of 1 A g-1 , had an energy density of 304 W h Kg-1 at the power density of 3.42 kW Kg-1 . The device represented exceptional stability of 82% retention after 10000 cycles at a current density of 30 A g-1 . This was mainly due to increased electrochemical surface area and sufficient electron transfer rate in NAL@NCS nanocomposite. This study indicates that the prepared NAL@NCS hybrid nanocomposite is a promising candidate for the supercapacitor practical application.