Flexible electrochromic (EC) materials have an urgent demand in the current electronic equipment market due to their technological interest and applications. However, at present, few flexible EC devices developed by industry exist due to some problems and challenges still to be solved such as flexibility. In this work, we have successfully synthesized a novel thiophene-furan (TFu) monomer via Stille coupling reaction, and facilely electrochemically polymerized in a neutral Bu₄NPF₆-CH₂Cl₂ electrolyte system to afford the corresponding poly(thiophene-furan) (PTFu) polymer film with good flexibility. The electrochemical and photoelectrochemical analyses of the as-prepared PTFu demonstrate that it has achieved the improved EC performance compared with pure polyfuran and polythiophene polymers, and as a result it possesses favorable EC parameters manifested as a reasonable ΔT (32.1%), faster response (1.38 s), excellent coloration efficiency (CE, 300.9 cm²·C⁻¹), and after a continuous redox process up to 2000 s, its optical stability can be maintained at 96%, and even after 3000 s, it can still be maintained at 80%. In addition, the successful assembly of the electrochromic device of PTFu film can easily realize the reversible conversion of the color from orange to gray. All these systematic studies suggest that the as-prepared flexible PTFu film is a promising candidate for EC materials and has great potential interest for versatile EC applications.

柔性电致变色（EC）材料由于其技术兴趣和应用而在当前的电子设备市场中迫切需求。然而，由于诸如柔性之类的尚待解决的问题和挑战，目前工业界开发的柔性EC器件很少。在这项工作中，我们已经通过Stille偶联反应成功合成了新型的噻吩-呋喃（TFu）单体，并在中性Bu ₄ NPF ₆ -CH ₂ Cl _2中容易地电化学聚合。电解质体系，以提供具有良好柔韧性的相应聚（噻吩-呋喃）（PTFu）聚合物薄膜。所制备的PTFu的电化学和光电化学分析表明，与纯聚呋喃和聚噻吩聚合物相比，它具有更高的EC性能，因此，它具有良好的EC参数，表现为合理的ΔT（32.1％），响应速度更快。 （1.38 s），优异的着色效率（CE，300.9 cm ² ·C ^-1），并且经过连续的氧化还原处理长达2000 s，其光学稳定性可以保持在96％，甚至在3000 s之后，仍可以保持在80％。另外，成功组装PTFu膜的电致变色装置可以轻松实现颜色从橙色到灰色的可逆转换。所有这些系统研究表明，所制备的柔性PTFu膜是EC材料的有前途的候选者，并且对于多功能EC应用具有巨大的潜在兴趣。