Electric glass is actually the use of electric field generated electrochemical redox reaction, resulting in changes in the characteristics of light penetration, resulting in color change. The electrochromic glass is generally composed of five layers of films, the layers of which are, in order, a transparent conducting layer, an electrochromic layer, an ion conductor layer, a counter electrode and another transparent conducting layer, respectively.

The preparation methods of violet tungsten are hydrogen reduction, reverse hydrogen reduction, and liquid ammonia reduction, and the most commonly used methods are hydrogen reduction and reverse hydrogen reduction. Take the reverse hydrogen reduction as the main method, this paper aims to investigate the advantages of tungsten reduction of ultrafine tungsten powder.

Nanotungsten trioxide is a typical N-type semiconductor functional material with large specific surface area, stable chemical properties, and wide band gap (2.2 ~ 2.8eV), can be said that tungsten trioxide is a natural beauty of photocatalytic material in the near-ultraviolet and visible light region has a strong absorption capacity, and good stability.

Tungsten trioxide is a n type semiconductor material, it is the most widely studied photochromic materials, WO3 has excellent electrochromic properties, however, WOX can be dissolved in proton electrolyte, which limits its application in electrolyte for proton conduction layer in electrochromic devices.

Cesium tungstate (Cs₂WO₄), as a new heat insulation material found in recent years, has been widely used in the field of transparent insulation film. Recently, a team has published reports on the preparation of cesium tungstate with solid-phase method and used in the field of photocatalysis.

Tungsten trioxide is mainly used for high melting point alloy and cemented carbide, tungsten wire and fire gas sensitive materials, also for the photocatalytic materials.