Synergistic integration of VSe and CuS nanostructures for advanced energy storage applications.

The demand for sustainable energy storage has driven advancements in supercapacitors, known for their high-power density and rapid charge cycles. However, challenges like limited energy density and material stability must be addressed for practical applications. In this study, VSe/CuS nanocomposites were synthesized using a simple wet chemical method and investigated as electrode materials for supercapacitors. X-ray diffraction (XRD) analysis confirmed the phase purity of the materials while scanning electron microscopy (SEM) revealed spherical and flake-like morphology. The synergy between VSe's high electrical conductivity and CuS's pseudocapacitive properties enhances charge storage and electrochemical performance. The VSe/CuS electrode exhibited a high specific capacitance of 853.9 F/g at 1 A/g, outperforming individual VSe (395.6 F/g) and CuS (471.6 F/g). The VSe/CuS||AC device demonstrated a specific capacitance of 147.6 F/g, excellent rate capability, and 88.3% capacitance retention over 10,000 cycles at 10 A/g. These findings highlight the potential of VSe/CuS nanocomposites as high-performance electrode materials, advancing the development of next-generation energy storage technologies.