Insight into the synergetic effect of WO3-supported NiMoO4 nanocomposite application in high-performance electrochemical supercapacitor

Abstract

Much emphasis has been paid to the investigation of electrode materials with improved electrochemical performance that are inexpensive and environmentally benign. WO₃/NiMoO₄ nanocomposites were synthesised at varying reaction temperatures (120, 150, and 180 °C) via the hydrothermal method to exploit the synergistic effect for charge storage performance. The WO₃/NiMoO₄-120 nanocomposites displayed an outstanding specific capacitance of 875 F g⁻¹ at 1 Ag⁻¹, whereas the composites synthesized at 150 and 180 °C exhibited lower specific capacitances due to the morphology of the WO₃ collapsing at higher reaction temperatures. However, the crystalline nature of the composites was retained. Furthermore, it has extraordinary dependability with over 90.48% capacitance retention after 5000 cycles and minimal charge transfer resistance. The composites exhibited high energy density (59.8 Wh kg⁻¹ at a power density of 588.2 W kg⁻¹), which is better than that of the individual components of WO₃ nanocubes and NiMoO₄ nanosheets. The outstanding electrochemical performance of the WO₃/NiMoO₄ nanocomposite is ascribed to the promising synergetic effect of NiMoO₄ and WO₃, which optimizes the material's potential as an electrode material by facilitating electron transport pathways. It suggests that the WO₃/NiMoO₄ nanocomposites could be a promising candidate for use as high-performance supercapacitors.