Bismuth niobium oxide (BiNbO4) coated on rGO nanocomposite formation for the application of the supercapacitor

• The hydrothermal route was used to synthesize BiNbO 4 @rGO nanocomposites. • The BiNbO 4 @rGO composite attained a capacitance of 1045.13F/g at the applied current density of the 1 A/g. • BiNbO 4 @rGO nanocomposite exhibits superior efficiency as compared to pristine material 53.39 and 122.44% respectively. • Electro-chemical performance of the hybrid capacitor has excellent stability after the 40 h chronoamperometry test. In the current work, hybrid supercapacitors achieve hydrothermally with the desired high capacitance characteristics, and more safe, faster and more efficient energy material by integrating both faradaic and non-faradaic for charge storing mechanisms. Bismuth niobium-based oxide with its orthorhombic phase structure (BiNbO 4 ), possesses two-dimensional transport channels that facilitate rapid diffusion. This characteristic makes it a highly attractive option for enhancing the power density of electrode materials. The nanocomposite formation of BiNbO 4 with rGO was responsible for the high capacitive properties. Then, the material structural, surface and morphological behavior was asserted via the X-Ray diffractometry (XRD), scanning electron microscopy (SEM) and Brunauer Emmet Teller (BET) technique as well as the electro-chemical properties was characterized via cyclic voltammetry (CV), chronoamperometry and galvanostatic charge discharge (GCD) test. The BiNbO 4 @rGO nanocomposite demonstrated significant capacitive performance, achieving 1045.13F/g at a given current density of 1 A/g, with exceptional stability. Furthermore, its nanocomposite achieved an energy of 44.4 Wh/kg at a specific power of 285.3 W/kg and exhibited superior coulombic efficiency. Hence the above-mentioned properties, favourable capacitance and stability outcomes are likely to enhance the fabrication of such energy-efficient and cost-effective supercapacitors electrode for energy storage technologies and portable electronic devices.