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Directly grow high performance WO3 films by a novel one-step hydrothermal method to significantly improve stability for electrochromic application

Abstract

Currently, the electrochromic technology is still facing problems of high-cost and inadequate electrochromic performance. The WO3 film prepared by conventional hydrothermal method usually needs a crystal seed layer to be prepared on the substrate, which brings additional energy consumption and retards electron transport. This paper presents a novel idea of one-step hydrothermal synthesis combining the self-seeded agent glycerol with the capping agent ammonium sulfate ((NH4)2SO4), which avoids complex preparation process and significantly enhances cyclic stability. Under the synergistic effect of glycerol and (NH4)2SO4, the resultant hexagonal system WO3 (hex-WO3) film exhibits a novel “coral-like” nanostructure and shows excellent electrochromic properties: a fast switching time (6/5 s for bleaching/coloration), a good coloration efficiency (56.5 cm2 C-1) and a large optical modulation (~78.1%) at 630 nm by applying ±1 V voltages. More importantly, the film obtains outstanding cyclic stability (15000 cycles without significant decay). Additionally, the electrochromic device (ECD) has been successfully assembled, exhibiting fascinating performances, in which Prussian blue (iron (Ⅲ) hexacyanoferrate (Ⅱ), PB) as complementary electrode.

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Publication details

The article was received on 02 Feb 2019, accepted on 05 Apr 2019 and first published on 05 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01333D
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Directly grow high performance WO3 films by a novel one-step hydrothermal method to significantly improve stability for electrochromic application

    J. Pan, Y. Wang, R. Zheng, M. Wang, Z. Wan, C. Jia, X. Weng, J. Xie and L. J. Deng, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01333D

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