WS2/Metal Oxide Nanohybrid Electrodes for High-Performance Supercapacitors

Abstract

Tungsten disulfide (WS2) nanosheets decorated with cobalt oxide (Co3O4) and ruthenium oxide (RuO2) nanoparticles (WS2/Co3O4 and WS2/RuO2) are synthesized using a simple hydrothermal method followed by chemical deposition for supercapacitor applications.WS2 provides mechanical stability and serves as a conductive channel, while metal oxides contribute to high capacitance. The electrochemical performance of WS2/Co3O4 and WS2/RuO2 electrodes are evaluated in symmetric two-electrode configurations, achieving specific capacitances of 425 and 753 F g−1, respectively, at 1 A g−1. The devices exhibit energy densities of 38 Wh kg−1 (WS2/Co3O4) and 67 Wh kg−1 (WS2/RuO2) at a power density of 0.8 kW kg−1. Both devices demonstrate excellent cyclic stability over 10 000 charge-discharge cycles. Additionally, the supercapacitor successfully powers an LED, highlighting its practical applicability.