Hydrothermal formation of tungsten trioxide nanowire networks on seed-free substrates and their properties in electrochromic device

Chung Jung Hung, Yi Hsuan Huang, Chih Hao Chen, Pang Lin, Tseung-Yuen Tseng

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Facile and cost-efficient hydrothermally grown 3-D tungsten trioxide WO3nanowires (NWs) network film on seed-free fluorine-doped tin oxide (FTO) substrates without using additive or capping agent is reported. The NW networks are hexagonal phase and the morphologies are changed by adjusting the pH of precursor solutions. Growth mechanism of WO3NWs is also extensively discussed. The designed porous film exhibits remarkable enhancement of the electrochromic (EC) properties. In particular, a significant optical modulation (57% at 632 nm), fast color switching speed (bleaching: 7 s and coloration: 21 s), high coloration efficiency ( 120.3 cm2 C -1 at 632 nm), high Li+ diffusion coefficient (2.14 × 10-9 cm2 s-1) , and excellent cycling stability (87% after 1000 cycles) are achieved for the 3-D NWs film. The improved EC properties are mainly attributed to the highly porous film, which makes the Li+ diffusion becomes easier and provides larger specific surface area for charge-transfer reactions. Furthermore, we also reported an EC device (50 mm × 50 mm) with a simple two-electrode configuration showing high optical contrast. The 3-D WO3 NWs network film acts as an excellent EC material.

Original languageEnglish
Article number6725611
Pages (from-to)831-839
Number of pages9
JournalIEEE Transactions on Components, Packaging and Manufacturing Technology
Volume4
Issue number5
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Electrochromic device
  • Growth mechanism
  • Nanowire
  • Tungsten trioxide

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