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Niobium Tungsten Oxides for Electrochromic Devices with Long-Term Stability
Cong Wu1, Zewei Shao2, Wenbo Zhai1
1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
ACS Nano
|January 26, 2022
Summary
New niobium tungsten oxide films offer fast electrochromic responses for energy-efficient windows. These advanced materials exhibit rapid coloration and bleaching, improving light and heat regulation while maintaining stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy
Background:
- Electrochromic materials regulate light and heat, offering energy savings.
- Current limitations include slow response times, poor cycle life, and high power consumption.
Purpose of the Study:
- To develop novel electrochromic materials with improved performance.
- To investigate niobium tungsten oxides for energy-efficient applications.
Main Methods:
- Fabrication of Nb18W16O93 thin films.
- Electrochemical characterization including coloration/bleaching times and optical modulation.
- Assessment of electrochemical stability over 8000 cycles.
Main Results:
- Nb18W16O93 films demonstrated rapid redox kinetics: 4.7s coloration, 4.0s bleaching.
- Achieved 53.1% optical modulation at 633 nm with high coloration efficiency.
- Exhibited excellent electrochemical stability with 78.1% retention after 8000 cycles.
Conclusions:
- The open framework of Nb18W16O93 facilitates fast Li-ion intercalation/extraction.
- This material presents a promising strategy for electrochromic devices with fast response and stability.
