The production and characterization of MoS₂@ \({{Co}}_{3}{S}_{4}\) nanocomposites have primary importance in the enhanced uses of electrolytic energy storage. The utilization of Camellia sinensis (green tea) extract as a natural, green reducing and stabilizing agent in a hydrothermal synthesis method is what makes this work novel. Packed with flavonoids and polyphenols, the extract reduces the need for dangerous chemicals while promoting the regulated nucleation and development of the MoS₂@ \({{Co}}_{3}{S}_{4}\) composite. The successful creation of a crystalline MoS₂@ \({{Co}}_{3}{S}_{4}\) heterostructure with a 25.7 nm crystallite size was verified by X-ray diffraction (XRD). The presence of distinctive Co–S and Mo–S bonds, as well as surface hydroxyl and organic functional groups, was further confirmed by FTIR analysis, suggesting successful integration and surface functionalization. The redox peaks were detected by cyclic voltammetry (CV), supporting pseudocapacitive behavior. Excellent electrochemical performance was shown by galvanostatic charge-discharge (GCD) experiments, which demonstrated an 865 F/g maximal specific capacitance at 0.8 A/g. Following cycling, electrochemical impedance spectroscopy (EIS) demonstrated enhanced ion transport and low charge transfer resistance. High dielectric constant and AC conductivity were found in the dielectric characterization, confirming its multifunctionality. The present MoS₂@Co₃S₄ material can be considered an advanced green-synthesized electrode material due to its high specific capacitance (865 F/g at 0.8 A/g), low charge-transfer resistance, and enhanced dielectric properties, which collectively represent a significant improvement over many reported MoS₂ and Co₃S₄-based materials.
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