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<p>Electrochromic (EC) materials demonstrate unique advantages in modulation applications. However, hydrogels severely limit practical implementation due to defects like their single response mode. Prussian blue (PB) and tungsten oxide (WO<sub>3</sub>) films were prepared using electrodeposition technology. A sandwich-structured electrochromic device (ECD, with PB as the cathode and WO<sub>3</sub> as the anode) was constructed using polyvinyl alcohol/polyethylene imine/lithium chloride (PVA/PEI/LiCl) hydrogel as the electrolyte. The ECD exhibited reversible electrochemical switching during cyclic voltammetry (CV) testing over 50 cycles. After 20 cycles, the UV transmittance of the PB film increased from 17.4 to 22.1%. The impedances of the PB and WO<sub>3</sub> films were 26.39 and 67.43 Ohms, respectively. This relatively low impedance provides the foundation for the ECD’s reversible color-changing behavior. Following 100 CV cycles, the half-wave potential and redox current of the PB film remained essentially unchanged, ensuring the ECD’s electrochemical response and cycling stability. This work broadens the choice of electrolytes for ECDs, reduces encapsulation complexity, and offers a promising solution for sensing applications.</p>

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A PVA/PEI/LiCl hydrogel electrolyte for an electrochromic device with PB/WO3

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Wang Xinmiao,
  • Wang Xingxing,
  • Wang Yibo

摘要

Electrochromic (EC) materials demonstrate unique advantages in modulation applications. However, hydrogels severely limit practical implementation due to defects like their single response mode. Prussian blue (PB) and tungsten oxide (WO3) films were prepared using electrodeposition technology. A sandwich-structured electrochromic device (ECD, with PB as the cathode and WO3 as the anode) was constructed using polyvinyl alcohol/polyethylene imine/lithium chloride (PVA/PEI/LiCl) hydrogel as the electrolyte. The ECD exhibited reversible electrochemical switching during cyclic voltammetry (CV) testing over 50 cycles. After 20 cycles, the UV transmittance of the PB film increased from 17.4 to 22.1%. The impedances of the PB and WO3 films were 26.39 and 67.43 Ohms, respectively. This relatively low impedance provides the foundation for the ECD’s reversible color-changing behavior. Following 100 CV cycles, the half-wave potential and redox current of the PB film remained essentially unchanged, ensuring the ECD’s electrochemical response and cycling stability. This work broadens the choice of electrolytes for ECDs, reduces encapsulation complexity, and offers a promising solution for sensing applications.