Tailoring the electrochemical performance of SnO₂ decorated MoS₂ nanocomposites: An electrode material for the high-performance supercapacitor application

The increasing energy demand requires developing a sustainable energy storage system, and supercapacitors are the promising candidates for this purpose. This work focuses on the one-pot-based in-situ preparation and detailed analysis of nanocomposite-based electrode materials for supercapacitor. SnO₂ decorated MoS₂ nanocomposites are prepared at different SnO₂ wt ratios (x = 5, 10, and 15) using a hydrothermal method, designated as SM-5, SM-10, and SM-15, and their formation is confirmed through the SEM with EDS, TEM, and XRD. An electrochemical study revealed that the SM-10 has a high specific capacitance C_sp of 826.5 F/g at 1 mV/s from cyclic voltammetry and discharge C_sp of 648.4 F/g at 0.5 A/g from galvanostatic charge-discharge measurements, attributed to a diffusion-controlled process. Furthermore, SM-10 demonstrates long-term cycling stability, retaining 80.5 % of its capacitance after 1600 cycles at 1 A/g and 78.5 % after 8000 cycles at 5 A/g. These results highlight the better performance of SM-10, demonstrating the synergistic effect between SnO₂ and MoS₂, which enhances ion diffusion and the charge intercalation and deintercalation process, making it a promising material for supercapacitor applications.