Hierarchical WO₃ Hollow Shells: Dendrite, Sphere, Dumbbell, and Their Photocatalytic Properties

Abstract

In this work, hierarchical WO3 hollow shells: dendrites, spheres and dumbbells have been successfully synthesized by simply calcining the acid‐treated PbWO4 and SrWO4 as precursors at 500 °C for 2 h. These hollow structures were characterized using X‐ray diffraction, scanning and transmission electron microscopies, Brunauer–Emmet–Teller surface area and diffuse reflectance spectroscopy, respectively. Possible formation mechanisms for hollow WO3 shells consisted of tiny nanoplatelets were investigated in detail. Comparing with commercial WO3 particles, all the obtained hollow shells with larger BET surface areas showed enhanced photocatalytic activities for the degradation of organic contaminants under visible light irradiation.

Fabrication, magnetic, and ferroelectric properties of multiferroic BiFeO3 hollow nanoparticles

“…Recently, inorganic hollow nanostructures with a thin shell and large interior space have attracted intensive interest due to their high specific surface area, lower density, and excellent permeability, which give them many potential uses in applications involving chemical reactors, sensors, drug delivery, catalysis, and batteries. [1][2][3][4] The conventional approaches to deriving the inorganic hollow nanostructures are the template assisted method and interfacial synthesis. [5][6][7] One important process in both approaches is the removal of the template or the core after the shell formation, which results in complication of the preparation and limits their applications.…”

Mesoporous WN/WO3-Composite Nanosheets for the Chemiresistive Detection of NO2 at Room Temperature

“…Tungsten trioxide (WO 3 ) is a multifunctional material that has been widely investigated as a photocatalyst [20,21] and a gas sensor [22,23]. When applied as a gas sensing material, WO 3 exhibits sensitivity to several gases, and has especially high-sensitivity to NO 2 , making it an ideal material for detecting NO 2 [23][24][25].…”

PbCrO4 yellow-pigment nanorods: An efficient and stable visible-light-active photocatalyst for O2 evolution and photodegradation

“…In addition, the noble metallic composition may limit practical applications. Other O 2 evolution photocatalysts, such as TaON [12], Ta 3 N 5 [13], Fe 2 O 3 [14] and WO 3 [15], either are unstable under illumination or have weak photocatalytic performances. Developing highly efficient, low-cost and stable visible-light-active photocatalysts for O 2 evolution from water is a challenge.…”