Abstract
Abstract In this report, PEDOT composite films were prepared by in situ electrochemical polymerization. 1-Ethyl-3-methylimidazole bis(trifluoromethylsulfonyl)imide (EMI-TFSI) was used as an ionic liquid dopant for PEDOT:PSS films. Subsequently, these PEDOT:PSS/EMI-TFSI films were compared with PEDOT:PSS films based on their morphology, structure, electrochromic properties, and optical properties at different deposition voltages and deposition times. It was observed that the addition of EMI-TFSI enhanced all the aforementioned properties of the films. PEDOT:PSS/EMI-TFSI films were seen to have a larger ion diffusion coefficient (1.38 × 10−20 cm2·s−1), a wider color change range (43.48%), a shorter response time (coloring response time = 1.2 s; fade response time = 2 s), and a higher coloring efficiency (189.86 cm2·C−1) when compared with normal PEDOT:PSS films. The introduction of EMI-TFSI in the films ultimately resulted in superior electrochemical and optical properties along with higher stability.
Highlights
Electrochromic (EC) materials are smart materials that can change their optical properties reversibly and continuously through an electrochemical reaction under theTo overcome this complication and facilitate processing and preparation, EDOT is usually doped with watersoluble electrolytes to prepare PEDOT composites like polystyrene sulfonic acid (PSS)
Dobbin and Mecerreyes reported that PEDOT:PSS composite films were prepared by doping different ionic liquids (ILs) as conductivity enhancers to improve the electrochemical performance of the films [24,25]
In order to illustrate the influence of EMI-TFSI on the composite film, its electrochemical performance was analyzed with cyclic voltammetry (CV)
Summary
Electrochromic (EC) materials are smart materials that can change their optical properties reversibly and continuously through an electrochemical reaction under the To overcome this complication and facilitate processing and preparation, EDOT is usually doped with watersoluble electrolytes to prepare PEDOT composites like polystyrene sulfonic acid (PSS). Dobbin and Mecerreyes reported that PEDOT:PSS composite films were prepared by doping different ILs as conductivity enhancers to improve the electrochemical performance of the films [24,25]. It has been proven that conductive polymers composed of ILs and PEDOT:PSS have high affinities and supramolecular ordering abilities Because of their unique characteristics, ILs have a wide range of applications in many fields, such as the synthesis, catalysis, and separation of organic and inorganic solvents, electrolytes in electrochemical devices, storage of enzymes, and reaction media [28]. The results are important for the basic research of electrochromism and open a new direction for achieving the long-desired green synthesis, durable, and large optical-modulation EC devices
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