Engineering Fe 2 WO 6 -Based Heterostructures for High-Performance Supercapacitors: Role of V 2 O 5 and g-C 3 N 4 Integration

Abstract

The performance of supercapacitors needs to be enhanced by the development of efficient electrode materials. In the present study, Fe 2 WO 6 nanoparticles were prepared using a hydrothermal method, followed by the preparation of Fe 2 WO 6 @V 2 O 5 and Fe 2 WO 6 @g-C 3 N 4 heterostructures through an in-situ deposition approach. The successful formation of the composites was confirmed using structural and optical characterization of XRD, FTIR, and UV Vis spectroscopy. XRD confirms crystalline phase purity and successful heterostructure formation for enhanced charge transport. FTIR verifies functional group integration, indicating improved interfacial bonding and electroactivity. The reduced band gap values of Fe₂WO₆@g-C₃N₄ (2.68 eV) and Fe₂WO₆@V₂O₅ (2.60 eV) facilitate enhanced charge transport and electrical conductivity, thereby suggested their suitability for energy storage applications. CV, GCD and EIS measurements were taken in three electrode system at a 1 M KOH electrolyte solution to test electrochemical performance. The specific capacitance of the Fe 2 WO 6 @V 2 O 5 electrode was 355.3 Fg -1 at 0.8 Ag -1 , which is higher than 277.5 Fg -1 of Fe 2 WO 6 @g-C3N4 along with a lower charge transfer resistance. The enhanced electrochemical performance is explained by the increased conductivity and strong synergistic interactions within the heterostructure, which facilitate efficient charge transport and ion diffusion. These results prove that Fe 2 WO 6 @V 2 O 5 heterostructure is an attractive electrode material towards high-performance supercapacitors. The paper offers some novel understanding of the design of Fe₂WO₆-based hybrid materials and points out their promising performance as efficient electrodes in the high-performance supercapacitor.