Smart windows have been used to reduce indoor energy consumption by utilizing materials with excellent near-infrared absorption properties, among which cesium tungsten bronze Cs_xWO₃ is one of the widely used materials. However, the stability of Cs_xWO₃ during applications is a very challenging problem. The electrochromic technology can be used to solve it. Here, nano Cs_xWO₃ with space group P6₃/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 electrochromic properties.

智能窗利用具有优异近红外吸收性能的材料来降低室内能耗，其中铯钨青铜Cs _x WO ₃是应用广泛的材料之一。然而，Cs _x WO ₃在应用过程中的稳定性是一个非常具有挑战性的问题。可以使用电致变色技术来解决它。这里，具有空间群P 6 ₃ / mcm的纳米 Cs _x WO ₃已经合成以通过调整溶剂热过程中的反应条件来研究晶体结构和形态对电致变色性能的影响。WO6骨架中六边形和三角形通道的尺寸随样品的反应条件而变化，并在Cs含量最高时达到最大值。簇状晶粒均匀分布在Cs含量最高的样品中。该样品的透过率调制范围和着色效率均是其他样品的数倍左右。WO6骨架中的大尺寸通道和棒状簇形态有助于提高电致变色性能。