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A Flexible and High-performance Electrochromic Smart Window Produced by WO3/Ti3C2Tx MXene Hybrids
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- Authors
- Van-Tam Nguyen, Bok Ki Min, Seong K. Kim, Yoonsik Yia, Choon-Gi Choi
- Issue Date
- 2021-03
- Citation
- Journal of Materials Chemistry C, v.9, no.9, pp.3183-3192
- ISSN
- 2050-7526
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- Tungsten oxide (WO3) is currently the most popular electrochromic (EC) material for EC devices due to its excellent electrochemical stability and EC reversibility. However, WO3generally has low conductivity, causing a high charge transport barrier; consequently, the EC devices based on WO3have long coloration/bleaching response time, low optical density, and low coloration efficiency. In this work, we demonstrated that the introduction of two-dimensional titanium carbide (2D Ti3C2Tx), a member of MXene, with excellent electrical conductivity leads to a significantly reduced charge transport barrier within WO3-based EC devices. The EC device based on the WO3/2D Ti3C2Txhybrid film fabricated by the spray-coating method exhibits a significantly enhanced EC performance with an optical modulation of 57.61% and a coloration efficiency of 126 cm2C?닋1. Interestingly, the switching response time is 1.5 s for bleaching and 2.7 s for coloration, and is 46.8% (for bleaching) and 62% (for coloration) shorter than the bare WO3-based EC device. Besides, a large-sized flexible smart window with an area of 15 cm × 15 cm is successfully fabricated and demonstrated. Our results provide insights into the effects of coupling WO3and Ti3C2Txto construct an outstanding EC device for smart window applications.
- KSP Keywords
- Charge transport, Coating method, Electrical Conductivity, High charge, High performance, Optical modulation, Spray coating, Transport barrier, Tungsten oxide, coloration efficiency, electrochemical stability