Fabrication of flexible electrochromic devices based on tungsten trioxide nanobundles

Chih Hao Chen, Tseung-Yuen Tseng*, Chung Jung Hung

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Low-cost and facile approach to grow quasi-one-dimensional hexagonal tungsten trioxide nanobundles (Q1D hex-WO3 NBs) on indium tin oxide (ITO) coated flexible polyethylene terephthalate (PET) substrate via hydrothermal method combined with electrophoretic deposition (EPD) technique is reported. Influence of the precursor concentration and hydrothermal reaction time on the morphology and size of as-synthesized WO3 nanostructures are investigated. Well-designed nanostructure exhibits remarkable enhancement in the electrochromic (EC) properties. In particular, a significant optical modulation (44% at 700 nm), fast color switching speed (bleaching: 22 s and coloration: 9 s), high coloration efficiency (89.8 cm2 C-1 at 700 nm), high Li+ diffusion coefficient (8.92 × 10-10 cm2 s-1), and excellent cycling stability (74% after 1000 cycles) are achieved for the Q1D hex-WO3 NBs film. Improved EC properties are mainly attributed from the Q1D hex-WO3 NBs. Li+ can transport quickly and easily diffused into the storage sites of the interface of the NBs. Furthermore, we also reported a large areal flexible EC device (70 mm × 70 mm) with a simple two-electrode configuration exhibiting outstanding mechanical flexibility and high optical contrast. The Q1D hex-WO3 NBs film acts as an excellent EC material.

Original languageEnglish
Title of host publicationProceedings of the 2nd International Conference on Intelligent Green Building and Smart Grid, IGBSG 2016
EditorsMichalea Lachmanova, Dusan Maga
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467384735
DOIs
StatePublished - 9 Aug 2016
Event2nd International Conference on Intelligent Green Building and Smart Grid, IGBSG 2016 - Prague, Czech Republic
Duration: 27 Jun 201629 Jun 2016

Publication series

NameProceedings of the 2nd International Conference on Intelligent Green Building and Smart Grid, IGBSG 2016

Conference

Conference2nd International Conference on Intelligent Green Building and Smart Grid, IGBSG 2016
CountryCzech Republic
CityPrague
Period27/06/1629/06/16

Keywords

  • Flexible substrate
  • electrocltromic device
  • nanobundle
  • tungsten trioxide

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    Chen, C. H., Tseng, T-Y., & Hung, C. J. (2016). Fabrication of flexible electrochromic devices based on tungsten trioxide nanobundles. In M. Lachmanova, & D. Maga (Eds.), Proceedings of the 2nd International Conference on Intelligent Green Building and Smart Grid, IGBSG 2016 [7539422] (Proceedings of the 2nd International Conference on Intelligent Green Building and Smart Grid, IGBSG 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IGBSG.2016.7539422