Computation and Investigation of Two-Dimensional WO·HO Nanoflowers for Electrochemical Studies of Energy Conversion and Storage Applications.

The aim of this study is to prepare a two-dimensional (2D) WO·HO nanostructure assembly into a flower shape with good chemical stability for electrochemical studies of catalyst and energy storage applications. The 2D-WO·HO nanoflowers structure is created by a fast and simple process at room condition. This cost-effective and scalable technique to obtain 2D-WO·HO nanoflowers illustrates two attractive applications of electrochemical capacitor with an excellent energy density value of 25.33 W h kg for high power density value of 1600 W kg and good hydrogen evolution reaction results (low overpotential of 290 mV at a current density of 10 mA cm with a low Tafel slope of 131 mV dec). A hydrogen evolution reaction (HER) study of WO in acidic media of 0.5 M HSO and electrochemical capacitor (supercapacitors) in 1 M NaSO aqueous electrolyte (three electrode system measurements) demonstrates highly desirable characteristics for practical applications. Our design for highly uniform 2D-WO·HO 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.