WS ₂ /Metal Oxide Nanohybrid Electrodes for High‐Performance Supercapacitors

Abstract Tungsten disulfide (WS ₂ ) nanosheets decorated with cobalt oxide (Co ₃ O ₄ ) and ruthenium oxide (RuO ₂ ) nanoparticles (WS ₂ /Co ₃ O ₄ and WS ₂ /RuO ₂ ) are synthesized using a simple hydrothermal method followed by chemical deposition for supercapacitor applications.WS ₂ provides mechanical stability and serves as a conductive channel, while metal oxides contribute to high capacitance. The electrochemical performance of WS ₂ /Co ₃ O ₄ and WS ₂ /RuO ₂ 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 (WS ₂ /Co ₃ O ₄ ) and 67 Wh kg ⁻¹ (WS ₂ /RuO ₂ ) 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.