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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Tungsten oxide (WO3) electrochromism is limited by poor durability in alkaline electrolytes.
  • Improving WO3 film lifetime and electrochromic performance is crucial for practical applications.

Purpose of the Study:

  • To develop a stable and high-performance WO3 electrochromic device.
  • To investigate the use of an ammonium-based electrolyte and an iodine-modified counter electrode.

Main Methods:

  • Optimized ammonium ion (NH4+) aqueous electrolyte and acidity for WO3 films.
  • Modified counter electrode using P10/ITO composite coating with NH4I additive.
  • Leveraged hydrogen-bond intercalation chemistry and reversible I0/I- couple.

Main Results:

  • Achieved significant optical modulation amplitude (45.5% at 633 nm).
  • Demonstrated excellent cycling durability with 94.4% retention after 200 cycles.
  • Introduced complementary electrochromism on the counter electrode via I0/I- conversion.

Conclusions:

  • The NH4+ electrolyte and WO3-iodine device offer a promising solution for durable electrochromic applications.
  • Optimized electrolyte concentration, acidity, and electrode modification enhance device performance and longevity.