Colorless to Multicolored, Fast Switching, and Highly Stable Electrochromic Devices Based on Thermally Cross-Linking Copolymerстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 октября 2021 г.
Аннотация:Transparent-to-colored electrochromic device exhibits promising application prospects and has gained popularity. Herein, two triphenylamine derivatives TPA-OCH3 and TPA-CN with styryl moieties and different donor or acceptor units were designed and synthesized to further prepare solvent-resistant thermally crosslinking polymer P(TPA-OCH3) and P(TPA-CN) without any additional initiator. P(TPA-OCH3) and P(TPA-CN) possess two pairs of redox peaks, and P(TPA-OCH3) shows lower onset oxidation potential compared to P(TPA-CN) due to the pendent donor unit. Correspondingly, both polymers exhibit multicolored changes from the neutral colorless state to noticeable oxidized colors under different potentials. The thermally crosslinking copolymer P(TPA-OCH3-co-TPA-CN) was obtained by TPA-OCH3 and TPA-CN (the molar ratio is 2: 1), which presents outstanding electrochromism with four color changes (colorless-orange-blue-purple) owing to the multi-step redox process of TPA-OCH3 and TPA-CN units. It is more intriguing that the electrochromic device based on the copolymer films possesses high optical contrast of 57.8% at 680 nm, fast switching time (0.52 s and 0.66 s) and robust cyclic stability over 30000 cycles with very little decay. Therefore, the thermally crosslinking copolymer is a promising candidate material for high-performance transmittive electrochromic device, such as smart windows, sunglasses and E-papers.