NiCo2S4 Nanoflowers for Exceptional Electrochemical Supercapacitor Energy Storage Performances

Abstract

The increasing demand for efficient and high-performance energy storage systems has prompted extensive research into advanced materials for electrochemical supercapacitors. Among these materials, NiCo2S4 nanoflowers have emerged as promising candidates, demonstrating remarkable electrochemical properties. A simple solvothermal method was employed to prepare NiCo2S4 nanoflowers with excellent morphology, showcasing a well-organized, dispersed, and well-developed structure. Purity, high crystal structure, and oxidation state were confirmed through XRD and XPS analyses, respectively. SEM analysis validated the morphology of both nanoflowers and nanoarrays, revealing a uniform and well-developed structure. The unique morphology plays a vital role in achieving excellent capacitance by providing a high surface area, maximizing the involvement of active metals, and reducing diffusion kinetics. The nanoflowers exhibited an outstanding capacitance of 877 F g−1, at a current density of 2 A g−1. Leveraging the synergistic chemistry of Ni and Co, the material not only demonstrated outstanding capacitance but also exhibited excellent stability of more than 91%, even after 5000 cycles. NiCo2S4 nanoflowers demonstrated an excellent energy density of 22 WhKg−1 and power density of 158 WKg−1. The excellent performances of NCS nanoflowers recommend it as a favorable pseudocapacitive nanomaterials for excellent energy storage applications.