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Preparation and electrochromism of pyrochlore-type tungsten oxide film

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Abstract

Pyrochlore-type WO3 powder was synthesized via hydrothermal method using aqueous sodium tungstate solution and oxalic acid as raw materials. The as-prepared powder was made into a soliquoid, from which films were made by dip coating process with indium–tin oxide (ITO). The obtained films were characterized by thermogravimetric and differential thermal analysis (TG–DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), chronoamperometry (CA) and ultraviolet–visible (UV–Vis) absorption. Results show that the crystal of the pyrochlore-type WO3 powder is perfect. When the calcination temperature rises from room temperature to 500 °C, the pyrochlore-type structure first becomes deformed, then it is destroyed and turns into amorphous phase, finally it will completely convert to WO3 with a monoclinic structure. Electrochemical and optical tests demonstrate that the film calcined at 300 °C exhibits the best electrochromic performance and has a coloration efficiency of up to 68.5 cm2·C−1 at 884 nm.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51274243) and the Project of Innovation-Driven Plan in Central South University, China (No. 2015CX001).

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Qiu-Sheng Zhou, Yong-Kun Chen, Xiao-Bin Li, Tian-Gui Qi, Zhi-Hong Peng & Gui-Hua Liu

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  1. Qiu-Sheng Zhou
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Correspondence to Qiu-Sheng Zhou.

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Zhou, QS., Chen, YK., Li, XB. et al. Preparation and electrochromism of pyrochlore-type tungsten oxide film. Rare Met. 37, 604–612 (2018). https://doi.org/10.1007/s12598-017-0886-9

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  • DOI: https://doi.org/10.1007/s12598-017-0886-9

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