Kaolin supported synergistic effects in g-C3N4/V2O5 nanocomposite systems for advanced energy storage applications

[Display omitted] •Kaolin/g-C3N4/WO3 nanocomposite has been synthesised and characterised.•The ternary nanocomposite has been characterized by various analytical techniques.•The specific surface area of the nanocomposite is obtained using BET isotherm.•The energy storage application of the nanocomposite has been studied using electrochemical, impedance and GCD studies. In order to investigate the synergistic potential of a new nanocomposite for improved energy storage applications, this work combines graphitic carbon nitride (g-C3N4), vanadium pentoxide (V2O5) and kaolin. Kaolin functions as a structural matrix, offering stability and support for the integration of g-C3N4 and V2O5 nanoparticles. It is well-known for its wide availability and thermal characteristics. A variety of analytical methods, such as electrochemical analysis, scanning electron microscopy and X-ray diffraction, are used to characterise the synthesised nanocomposite. The specific capacitance and cycling stability of the nanocomposite's electrochemical performance are rigorously assessed. Key issues in efficiency, stability and cost-effectiveness are addressed by an optimised material for advanced energy storage systems, which is the result of the synergistic effects coming from the unique features of each component. With a superior cyclic stability and capacitance retention of 77.7 % even after 2000 cycles, the composite material exhibits a higher specific capacitance value of 415 Fg−1 at 5 mVs−1. This work is a major step towards the creation of novel nanocomposites for high-performing, environmentally friendly energy storage systems.