<p>FeS/C composites were prepared via a simple grinding-assisted method and evaluated as electrode materials for supercapacitor applications. The effect of the FeS-to-carbon ratio and the incorporation of 1 wt.% Bi₂S₃ additive on the electrochemical performance were systematically investigated. Among the investigated samples, FeS/C(15:1) exhibited the best overall electrochemical performance, delivering a specific capacitance of 374.6 F g⁻¹ at 1 A g⁻¹. The incorporation of Bi₂S₃ led to a slight enhancement in electrochemical response, as evidenced by CV and GCD measurements. The improved performance is attributed to a more favorable balance between active material utilization and electrical conductivity within the composite. Although the electrochemical performance is not among the highest reported values, the present work demonstrates a simple, scalable, and cost-effective compositional optimization strategy without requiring complex synthesis procedures.</p>