Fabrication of Nickel-Cobalt Oxide/Polypyrrole via Hydrothermal Method for High-Performance Supercapacitors

In this research, a nanocomposite of microspherical polypyrrole and dandelion-like Nickel-Cobalt oxide was successfully synthesized on the Nickel Foam (NF) substrate with a hydrothermal method and employed as the electrode material for supercapacitor. The prepared nanocomposite was characterized by, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Energy-dispersive X-ray, and Fourier-Transform InfraRed spectroscopy (FT-IR). Also, electrochemical techniques were used for electrochemical characterization. NiCo2O4/PPy/NF electrode exhibits a high specific capacitance of 2342 F/g at a current density of 2.33 A/g and good cycle stability (79% capacitance retention after 2500 cycles) on the three-electrode system. Also, an asymmetric supercapacitor device was successfully assembled using a hybrid of NiCo2O4/PPy/NF and rGO/NF as positive and negative electrodes. The fabricated device showed a specific capacitance of 186 F/g at a current density of 1.8 A/g and good stability 80% after 1500 cycles. Results show that prepared electrode is suitable candidate for construction of high performance supercapacitors.