Yellow Tungsten Oxide Powder Applied for Large Area Electrochromic Glass

Yellow tungsten oxide powder for preparing large area electrochromic glass is a typical representative of cathode electrochromic materials. The large-area electrochromic glass assembled using tungsten trioxide film as the electrochromic layer is one of the main development directions of building energy conservation in the future. It is reported that the glass curtain walls applying with such smart glass can save more than 20% of peak demand of electricity.

More details, please visit:
http://www.tungsten-powder.com/tungsten-oxide.html

But do you know what the coloring mechanism of tungsten trioxide as a typical cathode coloring material is? Experts say that electrochromism of tungsten trioxide is a very complex phenomenon, which can be expressed by the following reaction formula:

(transparent) WO3+xM++xe-↔MxWO3 (dark blue)

In the formula, 0<x<1; M+ is H+, Li+, Na+ or K+; and e- represents an electron. The coloring process is an electron transfer process. And the optical absorption is mainly due to the change of covalent electrons from W5+ to W6+.

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