Tungsten Oxide

Development of new alternative electrode materials is essential in order for the polymer electrolyte fuel cell (PEFC) to be able to reach a broad market. Today, high platinum loadings are required, especially on the cathode, to obtain sufficient activity for oxygen reduction. In addition, electrode degradation causes loss of catalyst surface area and requires high initial loadings to maintain the cell performance over time. There are problems related to Pt also on the anode side where poisoning of the catalyst, by e.g. CO, reduces the activity. Approaches to improve the electrodes and reduce their costs are continuously evaluated and include alternative catalysts or supports as well as new structures and morphologies of the catalyst layer. Alternative catalysts, based on non-precious metals, Pt alloys/mixtures, and/or novel supports should preferably reduce the total amount of Pt, increase the activity, and be stable in the fuel cell environment. The support material can influence...

Tungsten oxide is an ideal photocatalyst in transition metal oxide which has properties of high catalytic property, low cost, nontoxic and stable. It is now used to degrade organic pollutant such as ethanal, chloroform and fuel into inorganic material. The principle is degrade it into CO 2  and H 2 O, it has high degradation efficient and wide application prospect. According to thermodynamic argument, the electron hole on the surface of tungsten oxide oxidizes the OH- and hydrone into OH- (free radical). OH- has strong oxidation capability, it can oxidize most of organic and inorganic pollutant and degrade them into innoxious substance like CO 2  and H 2 O. On the other side, active electron on the surface of tungsten oxide has strong reducing capability, it can reduce and remove heave metal ion in the water. Early research is mainly about applying nano powder semiconductor catalyst in eliminating pollutant in water, but the recovery of catalyst is difficult, it nee...

Tungsten disulfide is a kind of solid inorganic lubricant material. The appearance and physical property is similar to calcium disulfide. The physical and chemical property of tungsten disulfide shows that it can not only be used in the regular lubricant, but also can be applied under certain high temperature, low temperature, high load, high vacuum and corrosion circumstances. It can be used with powder appearance, or can be mixed with lubricant, graphite, metal powder or plastic as compound materials. With the development of scientific technology, the requirement for lubricant material has also been promoted. To solve the lubricant problems, tungsten disulfide has draw people’s attention like other innovative materials. Although there are many methods to prepare tungsten disulfide, the thorough material about its preparing method is rare. The method using tungsten oxide to prepare high purity tungsten disulfide is easy to operate and can assure the quality of the product. ...

Since indium storage property of nanocrystalline transition metal oxide (MO,M=Co, Ni, Cu, Fe) is found, other transition metal oxide such as CuO, Fe 2 O 3 , Fe 2 O 4 , Co 3 O 4 , WO 3  can be transited by chemical reaction MOx+2xLi+=M+xLi 2 O. Its capacity is far better than graphite anode material in lithium ion battery. Among which WO3 is the most stable oxide of tungsten under room temperature. It is not only environmental friendly, but also is cheap. It has potential to be widely applied as lithium ion battery anode material. However, tungsten oxide in lumpish has low electric conductivity, its volume changes greatly during charge-discharge process. Thus results in the instability of WO3. One of the improving methods is to synthesis WO3 nano material of different appearance. Then lithium storage property of the material is improved. Preparing method: By hydrothermal method, tungsten oxide nanorod can be prepared on the indium tin oxide substrate. Raw material: Sodi...

When particle size of some material reaches to nano grade (1~100nm), it can show many special reactions. It can be widely applied in functional information display, catalyst, magnetic material. Among which, tungsten oxide has various crystalline structure, it has a large amount of non-stoichiometry oxide form and has multi-functional broad-band gap semiconductor material. WO 3  is widely applied in gas sensor, photocatalyst, gasochromism, electrochromism, photochromism and solar cell due to its unique electricity, optical configuation, and magnetic property. Apart from that, temperature induces structure phase transition which results in the changes of volume, resistance and color greatly draw people’s attention. The research on its special structure has become the focus of recent study. The traditional preparing method of tungsten oxide nanotube need extra coating and sculpture process, the quality of nanotube greatly depends on the control of processing steps. By coaxia...

In recent years, one-dimensional nano material such as nanowire, nanorod, nanotube are becoming popular due to its special properties. Tungsten oxide is a special N type semiconductor material, and also one of the oxide semiconductors which can realize quantum size effect. It shows great property in electrochromism, photochromism, gasochromism and is applied in various fields like chemical sensor, fuel cell and electronic device. Tungsten oxide has crystalline form of orthogonality, monoclinic, cube and hexagonal. Among which hexagonal tungsten oxide is paid much attention due to its special hexagonal panel, many metal ion can inlaying in it. So as to form hexagonal tungsten bronze MxWO 3 ( M = Li  + 、Na  + 、K  + ). It shows great application prospect in negative electrode materials and Iithium ion rechargeable battery. Use sodium tungstate and hydrochloric acid as raw material, potassium oxalate and potassium sulphate as additive, hexagonal tungsten oxide nan...