Enhanced Coloration Time of Electrochromic Device Using Integrated WO<sub>3</sub>@PEO Electrodes for Wearable Devices
발표자
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초록
내용
Tungsten trioxide (WO3) has been widely used as an electrochromic material that exhibits excellent electrochromic performance with high thermal, mechanical stability. However, in a solid film-type WO3 layer, the coloration time was long due to its limited surface area and long diffusion paths of lithium ions (Li-ions). In this study, we fabricated a fibrous structure of WO3@poly(ethylene oxide) (PEO) composites through electrospinning. The fibrous layer showed a faster coloration time due to a short Li-ion diffusion path. Additionally, PEO in fibers supports Li-ions being quickly transported into the WO3 particles through their high ionic conductivity. The WO3@PEO structure showed 61.3 cm2/C of high coloration efficiency, 1.6s fast coloration time, and good cycle stability. Lastly, the electrochromic device was fabricated on fabric using gel electrolytes and conductive knitted fabric, showing a comparable color change through a voltage change from −2.5 V to 1.5 V.