Enhanced cycling rate performance of three-dimensional NiO as a positive electrode for hybrid supercapacitor

Electrochemical supercapacitors are effectively involved and have potential attention in recent years due to the greatest advancements in energy storage system. In that, the electrode materials play a crucial role in achieving better electrochemical concert. In this work, three-dimensional NiO nanostructures were proposed as the high-capacity positive electrode for hybrid supercapacitors. In addition, the 3D-NiO electrode achieved a capacitance of 1100 F g⁻¹ (605 C g⁻¹) alone with 95.5% super stability retention. Similarly, a carbon-doped g-C₃N₄ nanosheet electrode involved as a negative electrode, which delivers a stability retention of 89.9%. Further, a hybrid supercapacitor device was made up of NiO as a positive, carbon-doped g-C₃N₄ as a negative material in an aqueous system, which shows the remarkable energy and power densities of 31.7 Wh kg⁻¹ and 3625 W kg⁻¹. The device delivers an admirable electrochemical performance that provides a huge active surface during the ion transportation process. These tolerable electrochemical results of this gathered hybrid supercapacitor device will be promoted as a various electronic tool in future generation.