Abstract

Tungsten oxide (WO₃) has received attention as an electrochromic material because of its excellent properties. However, the long switch time and low coloration efficiency of WO₃ film limit its use. Herein, a nanocomposite film containing Preyssler-type polyoxometalate (POM) K_12.5Na_1.5[NaP₅W₃₀O₁₁₀]·15H₂O (P₅W₃₀) and WO₃ nanoparticles has been fabricated by layer-by-layer (LbL) self-assembly methods and characterized by UV-Vis spectra, scanning electron microscopy, X-ray photoelectron spectroscopy and electrochemical workstation. Compared to the pure WO₃ film, the [P₅W₃₀/WO₃]₂₀ film has better electrochromic properties. Then, the electrochromic properties of [P₅W₃₀/WO₃]₂₀ film were studied in different electrolyte. The results indicated that the composite film show high coloration efficiency (191.62 cm² C^− 1), fast switch time (2.58 s, 1.48 s), good CV stability (500 th) in 0.5 M LiClO₄/PC electrolyte, and successfully assembled of an electrochromic device. These advantages can make the nanocomposite film become a promising candidate for potential application in electrochromic devices.

Graphic Abstract

中文翻译：

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基于Presssler型多金属氧酸盐和氧化钨的薄膜的电致变色性能增强

摘要

氧化钨（WO ₃）由于其优异的性能而作为电致变色材料受到关注。然而，WO ₃膜的长切换时间和低着色效率限制了其使用。在此，已经通过逐层制备（LbL ）包含Preyssler型多金属氧酸盐（POM）K _12.5 Na _1.5 [NaP ₅ W ₃₀ O ₁₁₀ ]·15H ₂ O（P ₅ W ₃₀）和WO ₃纳米颗粒的纳米复合膜。 ）自组装方法，并通过UV-Vis光谱，扫描电子显微镜，X射线光电子能谱和电化学工作站进行表征。与纯WO相比_{如图3所示}，[P ₅ W ₃₀ / WO ₃ ] ₂₀膜具有更好的电致变色性能。然后，研究了[P ₅ W ₃₀ / WO ₃ ] ₂₀膜在不同电解质中的电致变色性能。结果表明，该复合膜在0.5 M LiClO ₄ / PC电解液中具有较高的着色效率（191.62 cm ² C ^-1），快速的切换时间（2.58 s，1.48 s），良好的CV稳定性（500 th）。电致变色设备。这些优点可以使纳米复合膜成为电致变色器件中潜在应用的有希望的候选者。

图形摘要