First investigation of high-performance FeS-based W 18 O 49 asymmetric supercapacitors operating at 1.6 V

This study presents a comprehensive evaluation of FeS-W O composite electrodes, revealing their exceptional performance for supercapacitor applications. Fabricated a wet-chemical method, the FeS-W O composites demonstrated a high specific capacitance of 558 F g at a current density of 1 A g , showcasing their outstanding charge storage capabilities. The composites achieved an energy density of 89.77 W h kg and a power density of 4950 W kg , attributed to the synergistic effect between the excellent electrical conductivity of FeS and the redox activity of W O , which collectively enhance the electrode's electrochemical performance. Moreover, the FeS-W O electrodes exhibited remarkable cycling stability, retaining 87.6% of their capacitance after 10 000 charge-discharge cycles. These findings underscore the potential of FeS-W O composites to advance supercapacitor technology by improving energy storage capacity and extending cycle life.