Enhanced Supercapacitor Performance of Polyindole Nanocomposites via Optimized <scp> 2D SnS ₂ </scp> Nanosheet Integration: Structural, Optical, and Electrochemical Investigations

ABSTRACT This study addresses the growing demand for sustainable energy storage by developing high‐performance supercapacitor electrodes based on polyindole (PIn) nanocomposites integrated with 2D SnS 2 nanosheets. Using cost‐effective and scalable hydrothermal and chemical oxidative polymerization methods, the electrodes were fabricated via spin coating. Structural (XRD, FE‐SEM, and SEM), optical (UV–Vis), and electrochemical (CV, GCD) analyses reveal that the 3% SnS 2 ‐doped composite exhibits a specific capacitance of 188 F/g and an energy density of 25.04 Wh/kg, outperforming pure PIn and many previously reported PIn‐based systems. The layered morphology of SnS 2 enhances ion transport and faradaic activity, making this composite a promising candidate for environmentally friendly hybrid energy storage applications.