<p>Zinc-ion hybrid supercapacitors (ZIHSCS) are emerging as one of the promising energy storage devices due to their environmentally friendly, low-cost fabrication, and improved gravimetric energy density. In this work, reduced graphene oxide (rGO) was prepared by a low-temperature exfoliation method. We tested the ZIHSC cell constructed using zinc foil as the anode and rGO as the cathode electrode material, respectively. A systematic investigation of the utilization potential window of the cell by cyclic voltammetry and galvanostatic charge–discharge experiments. The ZIHSC cell constructed using rGO cathode demonstrates a wide potential window of up to 2 V. A high discharge capacitance of 273 F g⁻¹ is observed at a current density of 0.5 A g⁻¹, along with high capacitance retention of approximately 91% after continuous 5000 cycles. The fabricated ZIHSC cell can deliver a high energy density of 294 Wh kg⁻¹ at a power density of 356 W kg⁻¹. The high performance of the cell is attributed to the stable layered stacked structures, which make the insertion/extraction of Zn-ions with good reversibility. The preparation method adopted for the preparation of rGO is convenient to produce on a large scale.</p>