Electrochemical performance of Bi₂WO₆/g-C₃N₄ (2D–2D) hybrid heterostructure as negative electrode materials for supercapacitor application

In this work, we have fabricated pseudocapacitor electrodes with 2D materials, including (Bi₂WO₆) and graphitic carbon nitride (g-C₃N₄)-based sandwich-like heterostructure by facile hydrothermal method. The synthesized Bi₂WO₆/g-C₃N₄ heterostructure nanocomposites were probed with different characterization techniques through X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray photon spectroscopy (XPS). The combination of Bi₂WO₆ and Bi₂WO₆-g-C₃N₄ created a synergistic and complemental effect, which enhanced the electrochemical performance. Bi₂WO₆-g-C₃N₄-based electrode exhibited a specific capacitance of 158 mF/g at a current density of 1 mA/cm². Binary nanocomposites-based electrodes displayed enriched capacity retention (90%) indicating better supercapacitive performance.