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Characterization of nanoparticulated WO3 electrochromic thin films prepared via precipitation reaction of peroxotungstic acid solution
Optical Materials ( IF 3.9 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.optmat.2021.111577
Yoon-Tae Park 1 , Ki-Tae Lee 1, 2, 3
Affiliation  

Amorphous WO3 thin films with a nanoparticulated morphology were fabricated using a combination of electrodeposition and electrophoretic deposition via the precipitation reaction of a peroxotungstic acid (PTA) solution. Due to the presence of the precipitated WO3 nanoparticles in the aged PTA solution, the electrophoretic deposition and electrodeposition occur simultaneously, which results in a grainy surface morphology in which nano-sized WO3 particles are embedded on a smooth WO3 thin film. The WAT-5 sample prepared with a PTA solution aged for 5 days exhibited faster ion intercalation/de-intercalation kinetics (coloration time of 3 s and bleaching time of 1 s), a greater transmittance modulation (68.36%), and a higher coloration efficiency (41.29 cm2/C) with better cyclic stability (91% retention during 300 cycles) than a WO3 thin film fabricated using the PTA solution without the aging process. The nanoparticulated morphology enhanced the active reaction area by expanding the interface between the electrolyte and the electrochromic material. Such results indicate that the electrochromic characteristics of WO3 thin films can be improved simply by adjusting the aging period of the PTA solution.



中文翻译:

过氧钨酸溶液沉淀反应制备纳米WO3电致变色薄膜的表征

通过过氧钨酸 (PTA) 溶液的沉淀反应,使用电沉积和电泳沉积的组合制造具有纳米颗粒形态的无定形 WO 3薄膜。由于在老化的 PTA 溶液中存在沉淀的 WO 3纳米颗粒,电泳沉积和电沉积同时发生,导致颗粒状表面形态,其中纳米尺寸的 WO 3颗粒嵌入在光滑的 WO 3 上薄膜。用 PTA 溶液老化 5 天制备的 WAT-5 样品表现出更快的离子嵌入/脱嵌动力学(着色时间为 3 秒,漂白时间为 1 秒)、更大的透射率调制 (68.36%) 和更高的着色效率 (41.29 cm 2 /C) 与使用 PTA 溶液制造的 WO 3薄膜相比,没有老化过程具有更好的循环稳定性(300 次循环期间保留 91%)。纳米颗粒形态通过扩大电解质和电致变色材料之间的界面来增强活性反应面积。这些结果表明WO 3薄膜的电致变色特性可以通过调节PTA溶液的老化时间来改善。

更新日期:2021-09-15
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