Surface Oxygen Vacancy Formulated Energy Storage Application: Pseudocapacitor-Battery Trait of W₁₈O₄₉ Nanorods

Abstract

Porous spherical bundles of W 18 O 49 nanorods with rich oxygen vacancy has been generated by a facile, low cost solvothermal approach and subsequently characterized for energy storage application. The remarkable electrochemical activity of W 18 O 49 nanostructure is referred to the development of oxygen vacancy and nanostructure network leading to maximize the active sites and surface area for the electrolyte ions. A specific capacity of 470 mA h /g at scan rate of 1mV/s and 452 mA h /g at a very high current density of 1.25 A/g were calculated in 1M H 2 SO 4 electrolyte. The experimental results revealed that surface oxygen vacancy enhances the adsorption and reaction site for electrolyte ions indicating the good electrochemical activity of the W 18 O 49 nanostructure materials. GCD summarizes an intermediate mechanism of pseudocapacitor-battery for W 18 O 49 nanorods. These findings will have a profound effect on understanding and mechanism of the surface induced vacancy to the process of electrochemical activity in terms of energy storage.

Thermal‐Oxidative Growth of Substoichiometric WO3–x Nanowires at Mild Conditions

“…71‐2450), respectively. [ 37–39 ] Similar XRD patterns were reported, for example, for W 18 O 49 NWs thermally grown at 650 °C from W films sputtered on alumina. [ 30 ] It is difficult to unequivocally assign the XRD pattern to a specific stoichiometry, as various tungsten oxide phase (e.g., W 10 O 29 or W 19 O 55 among others) have similar structures, i.e., exhibit a monoclinic geometry with analogous unit cell parameters.…”

Defect Mediated W18O49 Nanorods Bundle for Nonenzymatic Amperometric Glucose Sensing Application

“…Here an attempt has been made for exploring the application of defect containing nanomaterials with agglomerated nanorods bundle morphology, in the field of electrochemical glucose sensing. The energy storage application of this nanomaterial has already been reconnoitered in our previous manuscript . Now the work has been extended by investigating the glucose sensing application.…”

“…For synthesizing W 18 O 49 , a similar procedure such as shown in Scheme a was adopted . A translucent yellow solution was made by dissolving 0.1 g of tungsten hexachloride (WCl 6 ) powder in 60 mL of ethanol solvent.…”

“…For synthesizing W 18 O 49 , a similar procedure such as shown in Scheme 1a was adopted. 22 A translucent yellow solution was made by dissolving 0.1 g of tungsten hexachloride (WCl 6 ) powder in 60 mL of ethanol solvent. The solution was dissolved on a magnetic stirrer plate for half an hour to achieve a perfect dissolution.…”

“…The energy storage application of this nanomaterial has already been reconnoitered in our previous manuscript. 22 Now the work has been extended by investigating the glucose sensing application. Furthermore, the synthesized electrode with W 18 O 49 dispersed over carbon paper has been used for an electrocatalyst for glucose, and a superior stimulated performance was obtained by an electro-chemical test due to the existence of oxygen vacancies.…”