Computation and Investigation of Two-Dimensional WO(3)·H(2)O Nanoflowers for Electrochemical Studies of Energy Conversion and Storage Applications

[Image: see text] The aim of this study is to prepare a two-dimensional (2D) WO(3)·H(2)O nanostructure assembly into a flower shape with good chemical stability for electrochemical studies of catalyst and energy storage applications. The 2D-WO(3)·H(2)O nanoflowers structure is created by a fast and simple process at room condition. This cost-effective and scalable technique to obtain 2D-WO(3)·H(2)O nanoflowers illustrates two attractive applications of electrochemical capacitor with an excellent energy density value of 25.33 W h kg(–1) for high power density value of 1600 W kg(–1) and good hydrogen evolution reaction results (low overpotential of 290 mV at a current density of 10 mA cm(–2) with a low Tafel slope of 131 mV dec(–1)). A hydrogen evolution reaction (HER) study of WO(3) in acidic media of 0.5 M H(2)SO(4) and electrochemical capacitor (supercapacitors) in 1 M Na(2)SO(4) aqueous electrolyte (three electrode system measurements) demonstrates highly desirable characteristics for practical applications. Our design for highly uniform 2D-WO(3)·H(2)O as catalyst material for HER and active material for electrochemical capacitor studies offers an excellent foundation for design and improvement of electrochemical catalyst based on 2D-transition metal oxide materials.