[en] Highlights: • First report of simple and low cost SILAR synthesized Bi₂S₃ thin film as a pseudocapacitive electrode material. • Interconnected nanoparticles with porous morphology with uniform nanostructured possessed good crystallinity. • Bi₂S₃ thin film is a promising electrode material for supercapacitor with specific capacitance of 289 Fg⁻¹. Bi₂S₃ thin film electrode has been synthesized by simple and low cost successive ionic layer adsorption and reaction (SILAR) method on stainless steel (SS) substrate at room temperature. The formation of interconnected nanoparticles with nanoporous surface morphology has been achieved and which is favourable to the supercapacitor applications. Electrochemical supercapacitive performance of Bi₂S₃ thin film electrode has been performed through cyclic voltammetry, charge-discharge and stability studies in aqueous Na₂SO₄ electrolyte. The Bi₂S₃ thin film electrode exhibits the specific capacitance of 289 Fg⁻¹ at 5 mVs⁻¹ scan rate in 1 M Na₂SO₄ electrolyte.