Tungsten Oxide

Recently, China has developed a high-capacity, fast charging electrochromic battery. In this type of battery, tungsten oxide (WO 2.72 , i.e. violet tungsten oxide) nano-wires are taken as a positive electrode, and the metal aluminum is as the negative electrode; compared with other batteries, this kind of cell has some new advantages in the following aspects: 1. It establishes a capacity to identify of interface with the users through color changing, which the specific performance is: the transparent state on behalf of the full status of the battery; when it gradually turns to blue, it means the storage power starts to consume; and when the color reaches the deepest, it says the power is depleted; 2. By adding a trace amount of hydrogen peroxide, it can realize fast charging (full charged within 8s), besides, the traditional external power supply can be used for charging, and also the oxygen in the air can be used to achieve self-charging; 3. The battery capacity is six times...

Glucose exists in the nature by photosynthesis. Due to its abundant volume, low cost and reproducible, it is regarded as the main energy substrates to produce hydrogen. Glucose is the main waste of agriculture, food and paper-making industry, improper disposition will cause damage to environment. Recently many PEC systems produce hydrogen by glucose. Tungsten oxide connects with electrocatalyst to produce hydrogen from glucose shows good photocatalytic activity, deposit electrocatalyst on the surface of photocatalyst can promote photocatalytic activity of semiconductor. Electrocatalyst deposited on the surface of semiconductor will form a layer of cover. By changing electron distribution in the system, the surface property of WO 3  will be affected, so the photocatalytic activity is improved. Usually if Fermi level of WO 3  is higher than the two combined material, electron will keep migrating from WO 3  to depositing electrocatalyst. The shallow well potential Scho...

USTC(University of Science and Technology of China) recently announced that professor Xiong Yujie research group designed a kind of tungsten oxide nano structure in defect state based on inorganic solid accurate preparation of chemical and use crystalline defect project. Under broad spectrum illumination, it shows fine oxidation coupling catalytic property which is expected to realize low cost and low-energy organic chemical technology. Tungsten oxide has good photocatalytic property due to its special structure, it has already been used as varies of catalyst and also other industrial fields.  Most of catalytic reaction is based on the application of precious metal oxide and motivated by burning of petroleum and coal. It has disadvantages of high cost and high energy consuming. Compared to precious metal catalyst, metal oxide has benefits of low cost. However, it shows shortcomings in oxygen molecular system which can not capture solar energy and pass it into oxygen molecular...

Researchers in the US and Korea say they have developed a new way to make a flexible, resistive random access memory (RAM) device in a room-temperature process – something that has proved difficult to do until now.  The device, which is based on nanoporous tungsten oxide , is a bipolar switch and has a high on/off current ratio of more than 10 5 . It can also be bent and unbent over 10 3  cycles without suffering any significant loss in performance. For more than half a century, silicon-based complementary metal-oxide-semiconductor (CMOS) transistors have been the uncontested leaders in the electronics memory industry. However, such memory is reaching its fundamental limits because it is difficult to make CMOS transistors any smaller using current technology – something that will be a drawback for next-generation nanomemory applications. These memories are also quite expensive to assemble and suffer from relatively low switching speeds (of a few microseconds). Rese...

An international research team has used tungsten oxide thermal metamaterial to control the emission of radiation at high temperatures, an advance that could bring devices able to get efficient waste-heat harvesting technology from power plants and factories. Roughly 50 to 60 percent of the energy generated in coal and oil-based power plants is wasted as heat. However, thermophotovoltaic devices that generate electricity from thermal radiation might be adapted to industrial pipes in factories and power plants, as well as on car engines and automotive exhaust systems, to recapture much of the wasted energy. In new findings, researchers demonstrated how to restrict emission of thermal radiation to a portion of the spectrum most needed for thermophotovoltaic technology. "These devices require spectrally tailored thermal emission at high temperatures, and our research shows that intrinsic material properties can be controlled so that a very hot object glows only in certain colors...

A new material that emits short-wavelength thermal radiation when heated could be used in systems that convert waste heat into electrical energy thus boosts waste heat harvesting. Created by an international team co-led by researchers at Purdue University, the University of Alberta and Hamburg University of Technology, the material comprises alternating layers of 20 nm of tungsten oxide and 100 nm of hafnium oxide. Tungsten oxide is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals. Tungsten ores are treated with alkalis to produce WO3. It is insoluble in H2O and acids, but soluble in hot alkalis. It is n type semiconductor material, the special physical and chemical property make it used in various filed and become the important functional material in modern scientific research. The structure was chosen so that the emission of long-wavelength infrared photons f...