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Porous WO3/reduced graphene oxide composite film with enhanced electrochromic properties

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Abstract

The porous WO3/reduced graphene oxide (rGO) composite films are prepared on indium–tin oxide (ITO) glass by sol-gel method. The mixture sol combines peroxotungstic acid solution with rGO dispersion reduced by ethylene glycol (EG). The excessive EG and other organic additives are subsequently removed by annealing, which leads to the formation of porous structure. Compared with pure WO3 film, WO3/rGO composite film shows improved electrochromic performance because of enhanced double insertion/extraction of ions and electrons. It realizes a large optical modulation (64.2 % at 633 nm), fast switching speed (9.5 s for coloration and 4.5 s for bleaching), good cycling stability as well as reversibility.

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Acknowledgments

This work was supported by the Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions.

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Authors and Affiliations

  1. The College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, People’s Republic of China

    BoWen Zhao, ShuJuan Lu, Xin Zhang, Hao Wang, JingBing Liu & Hui Yan

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  1. BoWen Zhao
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  2. ShuJuan Lu
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  3. Xin Zhang
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  4. Hao Wang
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  5. JingBing Liu
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  6. Hui Yan
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Correspondence to Hao Wang.

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Zhao, B., Lu, S., Zhang, X. et al. Porous WO3/reduced graphene oxide composite film with enhanced electrochromic properties. Ionics 22, 261–267 (2016). https://doi.org/10.1007/s11581-015-1547-3

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  • DOI: https://doi.org/10.1007/s11581-015-1547-3

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