The increased industrialization and demand for renewable energy have inspired the research community to improve energy storage systems. From the last decade, the rise of the Metal-Organic Framework (MOF) has been proven to a revolutionary material for various applications. Herein, we have utilized ZIF-8 MOF to derive the ZnS nanoparticles through hydrothermal synthesis methods for energy storage applications. The nanoporous structure of ZIF-8 benefit to deliver the nanosized particles of zinc sulfide that can be useful in energy devices to provide high surface area for redox reactions. The obtained ZnS from ZIF-8 exhibit high crystallinity, high reaction sites, and nanoparticles confirmed from various characterization techniques including XRD, FESEM, and EDS. Further, the electrochemical testing has been done in the three electrochemical systems with 1M Na₂SO₄ electrolyte solution. The ZnS nanoparticles showed a capacitance of 190 F/g which can be attributed to the high surface area of the nanoparticles and redox activity. Additionally, the full symmetric solid-state supercapacitor device has been assembled with 1M Na₂SO₄ PVA electrolyte gel. The electrochemical device showed excellent electrochemical performance with long-term cyclability.