Facile thiol-ene photopolymerization of viologen films for high-performance electrochromic devices

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-09-25 DOI:10.1016/j.dyepig.2025.113279

Jia-Yi Zhang , Xue-Ru Yuan , Jia-Xin Li , Li-Yi Zhang , Zhong-Ning Chen , Feng-Rong Dai

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引用次数: 0

Abstract

We demonstrate a facile photopolymerization strategy based on thiol-ene click reaction for fabricating high-performance viologen-based electrochromic films and devices. Two terminal alkenes functionalized viologen derivatives (V1 and V2) were synthesized and copolymerized with pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) upon UV irradiation after simple blade-coating. The resulting PETMP-V2 film demonstrated superior stability during electrochromic cycles and significantly reduced film charge-transfer resistance, attributed to its longer alkyl chain facilitating ion transport. The corresponding electrochromic device achieved excellent performance with high optical contrast of ΔT = 80 % (604 nm), fast switching speeds within 3.4–5.3 s, high coloration efficiency of 298.45 cm²/C, and outstanding long-term cycling stability of over 1000 cycles with 94.0 % ΔT retention. Furthermore, the simple process enabled direct patterning of EC images on ITO, highlighting its potential for scalable manufacturing of customizable smart windows and displays.

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高性能电致变色器件中紫外光膜的易硫化硫烯光聚合

我们展示了一种基于巯基点击反应的简单光聚合策略，用于制造高性能的基于violoogen的电致变色薄膜和器件。合成了两个末端烯烃功能化紫菜衍生物（V1和V2），并与季戊四醇四基（3-巯基丙酸）（PETMP）进行了简单的叶片涂覆，紫外照射共聚。所得到的PETMP-V2薄膜在电致变色循环中表现出优异的稳定性，并且由于其更长的烷基链促进了离子的传输，显著降低了薄膜的电荷转移阻力。相应的电致变色器件具有优异的性能，光学对比度ΔT = 80% (604 nm)，切换速度在3.4-5.3 s内，显色效率高达298.45 cm2/C，并且具有出色的长期循环稳定性，超过1000次循环，保持率为94.0% ΔT。此外，这个简单的过程可以在ITO上直接绘制EC图像，突出了其在可定制智能窗口和显示器的可扩展制造方面的潜力。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.