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Title: Rapidly photocurable solid-state poly(ionic liquid) ionogels for thermally robust and flexible electrochromic devices
Authors: Poh, Wei Church
Eh, Alice Lee-Sie
Wu, Wenting
Guo, Xiaoyu
Lee, Pooi See
Keywords: Engineering::Materials
Issue Date: 2022
Source: Poh, W. C., Eh, A. L., Wu, W., Guo, X. & Lee, P. S. (2022). Rapidly photocurable solid-state poly(ionic liquid) ionogels for thermally robust and flexible electrochromic devices. Advanced Materials, 34(51), 2206952-.
Project: RG64/21 
Journal: Advanced Materials 
Abstract: Formation of ionogels through in situ polymerization can effectively improve electrolyte processability; however, the curing process has been slow and oxygen-sensitive. Considering the low oxygen solubility of poly(ionic liquid)s (PILs), in situ polymerized ionogels are designed to realize excellent electrolytes. Herein, two in situ polymerized ionogels (PIL A & PIL B) are formulated, and they can be rapidly photocured within a minute. The ionogels are highly transparent, stretchable, and exhibit excellent physicochemical stability, including thermal, electrochemical, and air stability, allowing them to perform in various conditions. Benefitting from these properties, two high-performance electrochromic devices (ECDs) are assembled, with iron-centered coordination polymer (FeCP) and tungsten oxide (P-WO3 ) electrochromic materials, achieving high color contrast (45.2% and 56.4%), fast response time (1.5/1.9 and 1.7/6.4 s), and excellent cycling endurance (>90% retention over 3000 cycles). Attributed to the thermal robustness of the ionogels, the ECDs can also be operated over a wide temperature range (-20 to 100 °C). With the use of deformable substrates (e.g., ultrathin ITO glass), curved electrochromic eye protector and flexible electrochromic displays are realized, highlighting their potential use in futuristic wearables.
ISSN: 0935-9648
DOI: 10.1002/adma.202206952
Schools: School of Materials Science and Engineering 
Organisations: Singapore-HUJ Alliance for Research and Enterprise (SHARE)
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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