Electrochromic device based on electrospun WO3 nanofibers

• WO3 electrochromic nanofibers were prepared by electrospinning technique.
• WO3 nanofibers switched reversibly from transparent to blue color.
• Electrochromic device was assembled using ionic liquid based gel electrolyte.
• Significant optical modulation and excellent cycling stability were achieved for ECD.

The tungsten oxide (WO3) nanofibers were grown directly onto an ITO-coated glass via an electrospinning method for electrochromic applications. The electrochromic properties of WO3 nanofibers were investigated in the presence of different electrolytes including a series of ionic liquids and classic LiClO4-PC system. A significant optical modulation of 20.82% at 760 nm, reversible coloration with efficiency of 64.58 cm2/C and excellent cycling stability were achieved for the nanofiber electrochromic device (ECD) with ionic liquid based gel electrolyte.

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