Cosolvent Multivalent Cation Hybrid Electrolyte for High-Performance Dual Band WO₃-Based Electrochromic Device

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Electrochromic devices offer potential for smart windows and electronics.
• Poor cation-electrolyte compatibility hinders electrochromic device performance.

Purpose of the Study:

• To develop a high-performance WO3-based electrochromic film and device.
• To address the cation-electrolyte incompatibility issue in electrochromic systems.

Main Methods:

• Employed a cosolvent multivalent cation hybrid electrolyte strategy.
• Introduced H2O molecules to modulate cation solvation structure and ion transport.
• Utilized synergistic effects of Zn2+/Al3+ hybrid ions.

Main Results:

• Achieved 96.0% optical modulation at 633 nm and 5000 cycles for WO3 film.
• Demonstrated dual band independent modulation and significant energy-saving potential (128.66 MJ/m2).
• Enhanced interfacial compatibility between electrolyte and WO3 film.

Conclusions:

• The cosolvent multivalent cation hybrid electrolyte strategy is effective for high-performance electrochromic devices.
• This approach enables large optical modulation and long cycle life.
• Highlights a promising direction for next-generation electrochromic applications.