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Amorphous Hydrated Tungsten Oxide Films with Electrochromic Cycling Stability Up to 40 000 Cycles Enabled by
Junyi Wang1,2,3, Jingbo Weng2, Lu Wang1
1Key Laboratory of Functional Materials and Applications of Fujian Province, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China.
ACS Applied Materials & Interfaces
|October 28, 2025
Summary
Researchers enhanced electrochromic (EC) cycling stability of amorphous tungsten oxide to 40,000 cycles. This was achieved by controlling water content and coloring potential, improving smart window durability.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Amorphous tungsten oxide is a key electrochromic (EC) material for smart windows.
- Poor cycling stability limits its practical application due to ion trapping and structural degradation.
Purpose of the Study:
- To significantly enhance the EC cycling stability of amorphous hydrated tungsten oxide films.
- To investigate methods for improving durability for practical smart window applications.
Main Methods:
- Regulating structural water content in amorphous hydrated tungsten oxide films.
- Adjusting coloring potentials within an Al3+-based electrolyte.
- Analyzing ion trapping and microstructural stability through electrochemical cycling.
Main Results:
- Achieved 40,000 EC cycles without significant performance degradation.
- Decreased coloring potential (–0.2 to –0.8 V vs. Ag/AgCl) and increased structural water (0.9H2O for WO3) enhanced stability.
- Reduced ion trapping and maintained stable microstructures.
Conclusions:
- Lower coloring potentials mitigate ion trapping and structural damage during electrochromic processes.
- Increased structural water content facilitates ion diffusion and alleviates irreversible ion accumulation.
- A simple strategy effectively enhances amorphous tungsten oxide EC materials for practical use.
