Synthesis of Tungsten Trioxide Nanowires and Doping with Metals

SEM image of WO3 nanowires

Tungsten trioxide (WO3) is an n-type semiconductor oxide that possesses a large bandgap in the range of 2.6–3.0 eV and has the potential for a variety of applications such as electrochemical devices, photovoltaic devices, photocatalytic devices, electrochromic devices, dye-sensitized solar cells, optical devices, field-emission displays, and gas sensors. Meanwhile, with the development of one-dimensional nanostructures, dimensionality and size of the materials have also been regarded as critical factors that may bring some novel and unexpected properties.


Synthesis of Spherical Macroporous WO3 Particles

picture of 3D tomography image of spherical macroporous WO3 particles

Tungsten trioxide (WO3) has been extensively studied due to its affinity for visible light, chemical inertness, thermal stability, and harmlessness. These excellent properties make this material useful for solar-related applications such as photocatalysts, solar cells, water splitting, and hydrogen generation.


Au-Modified Tungsten Trioxide and Its Gas Sensing to NOx

HRTEM image of Au-WO3

Semiconductor metal oxides (SMOs) are highly potent gas sensors for gaseous detection in terms of screening of air eminence, low expenditure on synthesis and sensing property that can be modified. The semiconductor metal oxide gas sensor is considered the most capable gas-sensing device due to its high sensitivity, fast response, low cost, and small size.


Growth of Tungsten Trioxide on Carbon Nanowalls

SEM image of WO3-CNWs structure
Carbon nanowalls (CNWs) have a wide range of applications such as supercapacitors, Sensors and, etc due to its structure, electrical, optical and mechanical properties, CNWs are also named as vertical graphene nanosheets. They have a three-dimensional structure and represent a kind of maze (labyrinth-like) graphene nanosheets with vertical orientation on the surface, which can be freely Perpendicular to the substrate. Unlike carbon nanotubes, one of the characteristics of CNW is that their synthesis does not require a catalyst. Therefore, they can be synthesized on substrates of various materials, such as metals (stainless steel, Pt, Ti, Cu, Ni, Mo, Zr, Hf, Nb, W) semiconductors (Si) and even insulators (Al2O3, quartz). Tungsten oxide (WO3) is an important n-type semiconductor and it is a promising material to combine with carbon nanowalls.


WO3–Pt/C Electrocatalysts for Oxygen Reduction Reaction

picture of oxygen reduction reaction

Oxygen reduction reaction (ORR) has been widely studied for its applications in fuel cells. There is a growing demand for clean energy technologies such as fuel cells. Since the energy efficiency and battery voltage of electrochemical cells are limited by the slow kinetics of ORR.Currently, platinum dispersed on carbon (Pt/C) is the most active catalyst for ORR; however, in addition to its high cost, this metal also has problems with ORR overpotential and poor methanol tolerance. Supporting by transition metal oxides such as tungsten trioxide (WO3) and titanium dioxide (TiO2) to the Pt/C electrocatalyst provide not only active sites but also electronic and ionic conductivity.


Tungsten Carbide Hollow Microsphere Prepared via Ammonium Metatungstate as Electrocatalyst Support

SEM image of WC hollow microsphere

Hydrogen (H2) is widely concerned as the most potential candidate due to its high energy density and environmentally friendly reaction process. Electrochemical water splitting is a promising hydrogen production technology because it does not contain greenhouse gases and is economical and efficient. As a key semi-reaction process, the hydrogen evolution reaction (HER) plays a decisive role in the efficiency and cost of hydrogen production through electrochemical water splitting.


WO3 Based Composite Prepared by Ammonium Metatungstate for Selective Catalytic Reduction of NOx

picture of WO3 based catalyst

The nitrogen oxides (NOx) produced by mobile and stationary sources are the main sources of photochemistry and smog acid rain. Ammonia selective catalytic reduction (SCR) is one of the most effective methods for removing NOx. It is widely used in power plants and other industrial environments.Due to its high oxygen storage capacity and excellent redox characteristics of conversion between Ce4+ and Ce3+, the application of cerium oxide-based oxides in the NH3-SCR reaction has attracted more and more attention. However, compared with vanadium catalysts, the SO2 tolerance is a great challenge for CeO2 SCR catalysts applied in stationary sources especially at low and mediate temperatures.


Ammonium Metatungstate Applied in Palm Oil Hydrogenation for Biodiesel

image of palm oil and palm seeds

The reduction of fossil fuel sources, environmental pollution caused by engine fuel combustion, and concerns about energy supply have prompted researchers to look for renewable energy sources. Biodiesel has a high flash point (>130 °C), octane number and high combustion yield, as well as appropriate density and viscosity, excellent lubricants, and free sulfur and aromatic compounds. These characteristics have been applied to this engine without any modification and warm-up.


CeO2–WO3 Catalysts Prepared for Selective Catalytic Reduction of NOx

picture of nitrogen oxide emission

Nitrogen oxides (NOx) emitted by fossil fuel combustion are one of the main air pollutants, posing a serious threat to the ecological environment and human health. To cope with huge environmental pressure and strict emission targets, NH3 selective catalytic reduction of NOx (NH3-SCR) is still the mainstream NOx control technology.


Ammonium Paratungstate for Preparing Superfine W–Cu Powders

picture of tungsten-copper alloy

Tungsten-copper (W-Cu) composite materials have comprehensive properties such as good thermal conductivity, electrical conductivity, low thermal expansion, non-magnetic, good performance under vacuum, and arc corrosion resistance, and are widely used in civil industry and aerospace fields. Therefore, they are often used as electrical contacts, especially in high voltage applications.




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