Electrochromic Characterization of WO3@PEO Fiber by Controlling the Solution and Electrospinning Conditions

Recently, as the interest in low power consumption increased, the industry of smart window market based on electrochromic is now spotlighted. Recent research has been conducted on a fiber-type polymer electrochromic device, but problems are emerging due to a complicated process, a long coloration time, and low coloration efficiency. In this research, we attempted to fabricate Tungsten trioxide (WO )@Poly(ethylene oxide) (PEO) fiber by electrospinning. The molecular weight of PEO and the applied voltage during electrospinning were adjusted to manufacture a uniform WO @PEO fiber, and the ratio of WO @PEO and the electrospinning time were adjusted to optimize the electrochromic characteristics. The WO @PEO fiber can be fabricated through an electrospinning method without a high-temperature process, which is advantageous for low process cost and large-area production. We also confirmed that since the high porosity of the WO @PEO fiber layer, it shows a high transmittance difference without no coloration time change by increasing the layer thickness.