Morphology-controlled WO_3−x homojunction: hydrothermal synthesis, adsorption properties, and visible-light-driven photocatalytic and chromic properties

Abstract

In this paper, a facile one-step hydrothermal method for the synthesis of crystalline-amorphous WO3−x core–shell nanopowders (nanoparticles, nanorods, and nanowires) is reported. The core–shell structure, the size and the morphology of the core, and the shell ratio can be controlled by pH, the content of oxalic acid and the content of ammonium tungstate. A possible formation and growth mechanism is proposed. It was found that oxalic acid determines the crystalline-amorphous core–shell structure and /OH− plays a key role in retarding the crystal growth along the [001] axis. The synthesis method may introduce a new way to monitor and tune the stoichiometric and substoichiometric composition of semiconductor oxide nanostructure. The homojunction exhibits an enhanced adsorption ability, obvious visible photocatalytic efficiency, and good photochromic and chemochromic properties.

A Wooden Carbon-Based Photocatalyst for Water Treatment

“…The hydrothermal method is a kind of liquid chemical technology that is synthesized by dissolution and recrystallization in a special closed container at high temperature and high pressure [123]. In a relatively simple process, crystalline-amorphous WO 3 -x coreshell nano-powder can be synthesized by the one-step hydrothermal method [128]. Wang et al prepared a new photocatalyst by growing photocatalytic V 2 O 5 in highly porous and solid DRWF and TWF substrates, which has the characteristics of economy, efficiency, sustainability and environmental protection [77].…”

Fluidity of casting Al–Si series alloys for automotive light-weighting: A systematic review

“…Nowadays, the development of new energy vehicles has attracted the focus of researchers. Considering that no revolutionary breakthrough has been made in the field of vehicle batteries, the industrial significance of automobile lightweight is particularly important [1][2][3][4]. As a result, foundry industries are facing urgent requests from the demanders to manufacture increasingly lighter castings with thin walls and complex shapes for automobile lightweight.…”

Synthesis Design of Electronegativity Dependent WO3 and WO3∙0.33H2O Materials for a Better Understanding of TiO2/WO3 Composites’ Photocatalytic Activity

“…Tungsten trioxide SCs can be synthesized via different methods, such as electrospinning [17,18], chemical vapor deposition [19,20], physical vapor deposition [21], ultrasonic spraying, laser pyrolysis [22,23], and hydro-/solvothermal crystallization [24][25][26].…”