Recently, transition metal dichalcogenides (TMDCs) have emerged as promising candidates as electrode materials for energy storage applications due to their remarkable physio-chemical properties. In the present work, a highly pure and crystalline tungsten diselenide (WSe 2 ) thin-film-based supercapacitive electrode has been successfully synthesized on a graphite substrate by using the DC magnetron sputtering method. Comprehensive characterization techniques including X-ray diffraction (XRD), Raman spectroscopy, Field emission-scanning electron microscopy (FE-SEM), and X-ray photoelectron spectroscopy (XPS) were employed to confirm the phase, elemental bonding, surface morphology, and chemical composition of the fabricated thin-film electrode, respectively. The sputtered WSe 2 thin-film electrode demonstrates an impressive increase in areal capacitance of almost 7.7 times when compared to the bare graphite substrate, with a measurement of 149.75 mF cm −2 . The electrode demonstrated excellent cyclic stability, retaining 86.15% of its capacitance even after 2000 cycles, showing the long-term usability and high potential of WSe 2 as an electrode. The capacitive performance of this symmetric supercapacitor device was carried out by using WSe 2 as a cathode as well as the anode with the 1 M Na 2 SO 4 electrolyte. Standing out in terms of electrochemical performance, the present symmetric supercapacitor executed a higher areal energy density and power density of 5.54 mWh cm −2 and 1197 mW cm −2 , respectively. This WSe 2 @graphite thin-film-based supercapacitive electrode with its superior electrochemical performance is believed to pave the way for the development of reliable and effective energy storage systems.