Polygonal-like structure WO3 by hydrothermal route: high performance and ultra-stable for supercapacitor applications.

In this study, the polygonal structure of WO₃ nanoparticles was constructed by the hydrothermal route, and the prepared materials were utilized for supercapacitor applications. The synthetic materials are WO₃ nanoparticles in their monoclinic phase, according to the X-ray diffraction data. The morphologies of the WO₃ samples are polygonal like and scanning electron microscope and transmission electron microscopy have confirmed it. To investigate the supercapacitance behavior of polygonal WO₃, various techniques were used, such as galvanostatic charge–discharge, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The polygonal WO₃ nanoparticle modified on Ni-foam as a working electrode has a specific capacitance value of 870 F g⁻¹ at 0.25 A g⁻¹. The polygonal structure of WO₃ nanoparticle-coated Ni-foam electrodes was very stable compared to other fabricated electrodes over the 10,000 cycles. The fabricated polygonal structure of the WO₃ electrode has high capacitance retention (100.2%) and high coulombic efficiency (99%). The polygonal structure of WO₃ makes it a particularly effective electrode material and a substantially better candidate for energy storage, especially supercapacitors. [ABSTRACT FROM AUTHOR]