Electrochromism refers to a stable and reversible change in the color or transmittance of a material under the action of an applied voltage or electric field. At present, electrochromic materials are considered to be one of the most promising smart materials, and it is expected to have great potential application value, such as smart window, automobile anti-glare rearview mirror and electrochromic display.

Nano tungsten disulfide can be processed by ball mill. This is a simple and low-cost method while the precision and size of nano tungsten disulfide are uncontrollable during the processing.

There are three main types of tungsten disulfide catalysts that have high chemical activity. They are hydrogenation active catalyst, non-polar functional material catalyst and photocatalyst. Tungsten Disulfide Catalysts have high application value in petroleum industry and other important fields.

Biscuit shaped nano tungsten disulfide can be prepared by calcining tungsten powder, sulfur powder and K₂HPO₄ salt at the temperature of 500°C. This method is simple, low-cost and suitable for mass production.