Effects of crystal structure and morphology on the electrochromic properties of CsxWO3

Smart windows have been used to reduce indoor energy consumption by utilizing materials with excellent near -infrared absorption properties, among which cesium tungsten bronze CsxWO3 is one of the widely used materials. However, the stability of CsxWO3 during applications is a very challenging problem. The electrochromic technology can be used to solve it. Here, nano CsxWO3 with space group P6(3)/mcm has been synthesized to study the effects of the crystal structure and morphology on the electrochromic properties by tailoring the reaction condition during the solvothermal process. The sizes of hexagonal and trigonal channels in WO6 framework change with the reaction condition of samples and reach to their maximum values at the highest Cs content. The cluster -shaped grains uniformly distribute in the sample with the highest Cs content. Both of the transmittance modulation range and coloration efficiency of this sample are about several times than those of other samples. The large-size channels in WO6 framework and rod-like cluster morphology facilitate the enhancement of electro-chromic properties.