Abstract Rational design of novel high-performance conjugated polymers is still central to the field of polymer electrochromics. In this work, a novel 3-methylselenophene-EDOT hybrid polymer is designed and electrosynthesized from the molecular precursor of 3-methylselenophene end-capped with 3,4-ethylenedioxythiophene (EDOT). The structural characterization, physicochemical properties, micromorphology, electrochemical behaviors, and electrochromic performance are systematically explored to reveal the structure-property relationship of both the precursor and the hybrid polymer. The precursor with planar structure exhibits a much lower onset oxidation potential (0.5 V) than that of both 3-methylselenophene (1.17 V) and EDOT (1.23 V). Low-potential electropolymerization yields smooth and compact hybrid polymer film with high conductivity (10−1 S cm−1) and excellent electrochemical stability under cyclic electrical loads. The 3-methylselenophene-EDOT hybrid polymer also exhibits the obvious color changes from brownish yellow in the reduced to transparent sky blue upon oxidization with favorable optical contrast (39%, 990 nm), high coloration efficiency (161 cm2/C) and fast response time (1.3 s) under low switching voltages.

中文翻译：

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3-甲基硒酚-EDOT杂化聚合物的光电性能调节

摘要 新型高性能共轭聚合物的合理设计仍然是聚合物电致变色领域的核心。在这项工作中，设计了一种新型的 3-甲基硒吩-EDOT 杂化聚合物，并由 3,4-亚乙基二氧噻吩 (EDOT) 封端的 3-甲基硒吩的分子前体电合成。系统地探索了结构表征、理化性质、微观形态、电化学行为和电致变色性能，以揭示前体和杂化聚合物的结构-性能关系。具有平面结构的前体表现出比 3-甲基硒酚 (1.17 V) 和 EDOT (1.23 V) 低得多的起始氧化电位 (0.5 V)。低电位电聚合产生光滑紧凑的杂化聚合物薄膜，具有高电导率 (10-1 S cm-1) 和循环电负载下优异的电化学稳定性。3-甲基硒酚-EDOT杂化聚合物在氧化时也表现出明显的颜色变化，从还原的棕黄色变为透明的天蓝色，具有良好的光学对比度（39%，990 nm）、高着色效率（161 cm2/C）和快速响应低开关电压下的时间 (1.3 s)。