As one of representative conducting polymers (CPs), poly(3,4-ethylenedioxythiophene) (PEDOT) possesses fascinating electrochromic properties and commercial applications, but it suffers from the poor cycling stability in the charge-discharge process. In this work, we adopted a dual-approach mode to prepare high-quality PEDOT film in boron trifluoride etherate (BFEE) system via reducing the initial oxidation potential (E_onset) of 3,4-ethylenedioxythiophene (EDOT) monomers to increasing the conjugation degree of PEDOT films and no requiring the addition of other supporting electrolytes to protect the initial structure of PEDOT films. The E_onset of EDOT monomers in BFEE system was only 0.5 V, which was much smaller than other systems reported (1.00–1.26 V). The obtained PEDOT film with porous structure showed remarkable stability with an electrochemical activity retention rate of 91.5% after 190,000 cycles, and that of its electrochromic device (ECD) was 94.23% after 41,000 s. During the redox process, ECD had three color transformations (brown red, cyan, and blue) and the oxidation time and the reduction time were 0.4 s and 1.2 s, respectively. The calculated CE value reached 120 cm² C⁻¹. All these results suggest that the dual-approach mode can significantly enhance the quality of PEDOT film and thus enhance its cycling stability. In addition to that, the dual-approach mode can provide an effective strategy for the design of highly stable CPs for fabricating long-term stable ECD.

作为代表性导电聚合物（CP）之一，聚（3,4-乙撑二氧噻吩）（PEDOT）具有令人着迷的电致变色性能和商业应用，但其充放电过程中的循环稳定性较差。在这项工作中，我们采用双方法模式，通过降低3,4-乙撑二氧噻吩（EDOT）单体的初始氧化电位（E _{onset ）}以增加共轭性，在三氟化硼乙醚（BFEE）体系中制备高质量的PEDOT薄膜。 PEDOT薄膜的程度，并且不需要添加其他支持电解质来保护PEDOT薄膜的初始结构。BFEE系统中EDOT单体的E_起始电压仅为0.5 V，远小于报道的其他系统（1.00-1.26 V）。所得多孔结构的PEDOT薄膜表现出优异的稳定性，19万次循环后电化学活性保持率为91.5%，其电致变色器件（ECD）41,000 s后电化学活性保持率为94.23%。在氧化还原过程中，ECD发生三种颜色转变（棕红色、青色和蓝色），氧化时间和还原时间分别为0.4 s和1.2 s。计算出的CE值达到120cm ² C ^-1。所有这些结果表明，双方法模式可以显着提高PEDOT薄膜的质量，从而提高其循环稳定性。除此之外，双方法模式可以为设计高稳定的CP以制造长期稳定的ECD提供有效的策略。