Polybenzimidazole-1D interconnected carbon framework decorated with nickel manganese oxide nanoparticles for hybrid supercapacitors

This study explores the synthesis and characterization of a ternary nanocomposite made up of nickel manganese oxide (NMO), polybenzimidazole (pBIM), and multiwalled carbon nanotubes (MWCNTs) for supercapacitor applications. Material characterizations confirm the structural integrity and uniformity of the synthesized components, which highlight their potential for stable performance. Through comprehensive electrochemical evaluations using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS), the NMO-pBIM-MWCNT ternary nanocomposite shows exceptional specific capacitance, energy density, and power density due to the synergistic effects among its components. The hybrid electrode achieves a maximum specific capacitance of 1766 Fg⁻¹ and an energy density of 62 Wh kg⁻¹. The fabricated symmetric supercapacitor device demonstrates a specific capacitance of 378.9 F g⁻¹, an energy density of 36.4 Wh kg⁻¹, and a power density of 171.5 W kg⁻¹ at a current density of 0.1 Ag⁻¹. We also investigate practical applications of the flexible supercapacitor device, showcasing its potential to power various loads with LED arrays. This study advances supercapacitor technology and highlights the versatility of ternary nanocomposites in meeting the evolving demands for energy storage.