Tungsten(IV) oxide

• CAS: 12037-58-0
• Catalog Number: ACM12037580
• Category: Main Products
• Molecular Weight: 215.85
• Molecular Formula: WO2.9
• Appearance: Blue powder

Case Study

Preparation of Pt-WO2.9 Composite Catalyst and Its Application in Formaldehyde Gas Sensor

Han, Fangjie, et al. Sensors and Actuators B: Chemical, 2018, 263, 369-376.

A new composite catalyst based on platinum and tungsten oxide (highly active substoichiometric WO 2.9) was prepared and used for formaldehyde (HCHO) electrooxidation and formaldehyde gas sensor. The results show that the HCHO sensor based on Pt-WO 2.9 shows a high sensitivity of 53 μA/ppm and good reproducibility and stability.
Construction of formaldehyde sensor based on Pt-WO 2.9
· WO2.9 and Pt nanoparticles were combined at varying mass fractions of 15%, 30%, and 45% (WO2.9) with 1 ml of 1:1 v/v ethanol/water and 20 μL of Nafion solution. The mixture was then subjected to ultrasonic treatment and the Pt-WO2.9 composites were evenly dispersed in the liquid. Subsequently, 5 μL of the catalyst ink (containing 20 μg of catalyst) was applied to a GCE with a diameter of 3 mm (loading 0.285 mg cm-2). The Pt-WO2.9 composites modified GCEs were allowed to dry at room temperature.
· To prepare the membrane electrode assembly, the Pt-WO2.9 composites dispersion was introduced to the membrane made of ion-conducting polymers using thermal spraying and then dried. After treating residual impurities with acetone washing, the working membrane electrode was obtained. The membrane electrode area was around 1 cm-2 (20mg catalyst).
· For the fabrication and measurement of the gas sensor, the sensor structure was assembled following the layout depicted in figure, with the electrodes, liquid storage chamber, diaphragm, and electrode lead connected accordingly.

Phase Structure and Substoichiometry of Tungsten Oxide Materials and Their Optoelectronic Applications

Cong, Shan, et al. Advanced Materials, 2016, 28(47), 10518-10528.

· Phase structure and substoichiometry
Tungsten oxide has a large number of allomorphs and substoichiometric compositions with intrinsic tunnels and oxygen vacancies. Tungsten oxides (WOx) in a broad sense (0 < x ≤ 3) are a series of complex materials with complicated polymorphisms and defect chemistry. The basic structure of the WO3 phase can be extended to WO2.9 compositions with self-doping of oxygen vacancies. Many stable substoichiometric examples, WOx (x varies from 2.625 to 2.92), have been reported, including W32O84, W3O8, W18O49, W17O47, W5O14, W20O58, and W25O73. These oxygen-deficient phases are also composed of edge-sharing WO6 octahedra, split by crystal shear planes (ordered oxygen defect planes).
· Optoelectronic applications of tungsten oxide
Tungsten oxide materials have rich chemical properties or diversity, making them attractive in a wide range of optoelectronic applications. Some applications related to phase structure/stoichiometry range from the traditional electrochromic/photochromic fields to the newly developed visible light-driven photocatalysis, photothermal/photodynamic therapy, and surface enhanced Raman spectroscopy (SERS) fields.
For example, Pt-loaded commercial WO3 is a typical photocatalyst under visible light (λ > 430 nm) irradiation, which has a higher removal efficiency for gaseous acetaldehyde than commercial WO3 or N-doped TiO2.

Custom Q&A

What is the molecular formula of Tungsten(IV) oxide?

The molecular formula of Tungsten(IV) oxide is WO2O2W.

What are the synonyms for Tungsten(IV) oxide?

The synonyms for Tungsten(IV) oxide are Tungsten dioxide and dioxotungsten.

What is the molecular weight of Tungsten(IV) oxide?

The molecular weight of Tungsten(IV) oxide is 215.84 g/mol.

How was the molecular weight computed?

The molecular weight was computed by PubChem 2.1 (PubChem release 2021.08.13).

When was the Tungsten(IV) oxide created and modified?

Tungsten(IV) oxide was created on 2005-03-27 and last modified on 2023-10-21.

What is the IUPAC name of Tungsten(IV) oxide?

The IUPAC name of Tungsten(IV) oxide is dioxotungsten.

What is the InChI of Tungsten(IV) oxide?

The InChI of Tungsten(IV) oxide is InChI=1S/2O.W.

What is the InChIKey of Tungsten(IV) oxide?

The InChIKey of Tungsten(IV) oxide is DZKDPOPGYFUOGI-UHFFFAOYSA-N.

What is the canonical SMILES of Tungsten(IV) oxide?

The canonical SMILES of Tungsten(IV) oxide is O=[W]=O.

What is the CAS number of Tungsten(IV) oxide?

The CAS number of Tungsten(IV) oxide is 12036-22-5.