Preparation of electrospun polyacrylonıtrile (PAN) nanofıber membrane gel electrolyte and its application in TiO 2 -based electrochromic devices
Ionics(2024)
Abstract
Electrochromic devices based on nanofiber membrane gel electrolytes offer several advantages over polymer gel electrolytes. Many advantages, such as high chemical stability, easy handling, less leakage, a wide working temperature range, and a long cycle life, show high compatibility of nanofiber membrane electrolytes in different electrochemical power devices. In this work, we have succeeded in replacing the liquid electrolyte with a nanofiber membrane–based gel electrolyte prepared by the electrospinning method and applied in electrochromic devices (ECD). Polyacrilonitrile (PAN)–based nanofibers were deposited on a spin-coated SnO 2 layer, prepared on a fluorine-doped tin oxide (FTO) glass substrate. The thickness of the fiber mat was varied by changing the time of the electrospinning. Gel-type membrane electrolyte was prepared by soaking the nanofiber membrane electrode in the 1 M LiClO 4 in propylene corbonate (PC) solution. TiO 2 electrochromic electrode was prepared by the “doctor blade” method. ECDs were fabricated with the configuration of FTO glass/TiO 2 /PAN-based nanofiber membrane gel polymer electrolyte/SnO 2 /FTO glass by sandwiching the two electrodes. Electrochromic performance of ECDs fabricated with nanofiber membrane gel electrolyte was compared with ECDs fabricated with liquid electrolyte (1 M LiClO 4 in PC) and PAN-based conventional gel electrolyte (PC (0.4 g) + ethylene carbonate (EC) (0.4 g) + LiClO 4 (0.03 g) + PAN). ECDs with nanofiber membrane gel electrolytes demonstrate a transmittance variation of 33.40% in the visible region which is 93% of the corresponding value obtained with liquid electrolyte–based ECD, whereas identical ECDs made with conventional gel electrolytes demonstrate a lower transmittance variation of 4.22%.
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Key words
Electrospun nanofiber membrane,Gel electrolytes,Electrochromic devices,Electrospinning
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