One‐Pot Synthesis of WO ₃ /WS ₂ Composite for High‐Performance Supercapacitor Electrodes

The development of efficient electrode materials through simple and scalable synthesis routes is essential for advancing high‐performance supercapacitors. Here, we report the synthesis of a tungsten oxide‐tungsten disulfide (WO ₃ /WS ₂ ) composite material using a facile one‐pot hydrothermal method. The coexistence of WO ₃ and WS ₂ materials is confirmed using TEM, XRD, XPS, and Raman spectroscopy. In the composite, the WS ₂ layers provide mechanical stability and high conductivity, whereas WO ₃ nanoparticles enhance the capacitance significantly through pseudocapacitive charge storage. The electrochemical measurements in a three‐electrode system with 1 M H ₂ SO ₄ electrolyte delivered a specific capacitance of 578.7 F/g at 1 A/g. A symmetric supercapacitor device fabricated with the composite presented an energy density of 10 Wh/kg at a power density of 800 W/kg, with nearly 100% capacitance retention after 10,000 cycles.