2 and TiO 2/WO 3 composite using metal oxide precursors for charge storage applications]]>

摘要

AbstractSynthesis of advanced functional materials through scalable processing routes using greener approaches is essential for process and product sustainability. In this article, syntheses of nanoparticles of titanium dioxide (TiO2), tungsten trioxide (WO3), WO3-doped titanium dioxide (W-TiO2) and TiO2/WO3composite at hydrothermal conditions using corresponding metal oxide precursors are described. Electrochemical charge storage capabilities of the above materials are measured using cyclic voltammetry, charge-discharge cycling and electrochemical impedance spectroscopy in aqueous KOH electrolyte. The TiO2and the WO3nanoparticle showed a specific charge (Q) of ～12 and ～36?mA?h?g?1at a current density of 2 A?g?1in 6?M KOH, respectively. TheQof TiO2increased upon W doping up to 25?mA?h?g?1for 5?wt% W-TiO2and the WO3/TiO2composite showed the highest storage capability (Q～40?mA?h?g?1). Changes in the charge storage capabilities of the doped and composite materials have been correlated to materials properties.Graphical abstractDisplay OmittedHighlights?Hydrothermal synthesis of ultrafine metal oxides and composites using oxide precursors.?This method works well for transition metal doped metal oxide nanostructures.?The WO3/TiO2composite showed superior charge storability than the single components.?The above electrode showed superior electrical conductivity and higher ion diffusivity.]]>