The nanoporous honeycomb like binary α-Sm2S3 material is used as supercapacitor electrode. The soft chemical, successive ionic layer adsorption and reaction (SILAR) method is employed for the α-Sm2S3 thin film growth. The synthesised films are characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM) for structural and morphological studies. Electrochemical behaviour is studied using cyclic voltammetry (CV), galvanostatic charge–discharge and electrochemical impedance spectroscopy (EIS). The observed specific and interfacial capacitance (C s and C i ) values in 1 M LiClO4–propylene carbonate (PC) electrolyte are 294 F g−1 and 0.0238 F cm−2, respectively at the scan rate of 5 mV s−1. An electrode stability of 89% retained after 1000 cycles. A galvanostatic charge–discharge and EIS study show ideal capacitive behaviour of α-Sm2S3 electrode.