WO3–V2O5–Carbon Fiber Self‐Supported Composite Electrodes for High‐Performance Supercapacitors

The design of high‐energy‐density device electrodes has garnered significant attention but remains a challenging task. This study proposes an effective strategy for constructing a ternary composite material (WO 3 /V 2 O 5 /CC‐ n , n = 1, 2, 3). Utilizing V 2 O 5 as a precursor, a highly efficient electrode (WO 3 /V 2 O 5 /CC‐2) with a 3D nanowire structure is designed. The results demonstrate that the WO 3 /V 2 O 5 /CC‐2 electrode exhibits enhanced capacitive performance with a specific capacity (495.6 F g −1 at 1 A g −1 ) and remarkable electrochemical stability even after 5000 cycles. Furthermore, kinetics analysis reveals that the charge stored on the electrode is primarily attributed to surface capacitive effects and diffusion‐controlled insertion processes. This facile preparation method of the WO 3 /V 2 O 5 /CC‐2 electrode derived from WO 3 and V 2 O 5 holds excellent potential for constructing new‐generation electrochemical energy‐storage devices with superb capacitance performance.