Abstract
Five carbazole-containing polymeric membranes (PDTC, P(DTC-co-BTP), P(DTC-co-BTP2), P(DTC-co-TF), and P(DTC-co-TF2)) were electrodeposited on transparent conductive electrodes. P(DTC-co-BTP2) shows a high ΔT (68.4%) at 855 nm. The multichromic properties of P(DTC-co-TF2) membrane range between dark yellow, yellowish-green, gunmetal gray, and dark gray in various reduced and oxidized states. Polymer-based organic electrochromic devices are assembled using 2,2′-bithiophene- and 2-(2-thienyl)furan-based copolymers as anodic membranes, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as the cathodic membrane. P(DTC-co-TF)/PEDOT-PSS electrochromic device (ECD) displays a high transmittance change (ΔT%) (43.4%) at 627 nm as well as a rapid switching time (less than 0.6 s) from a colored to a bleached state. Moreover, P(DTC-co-TF2)/PEDOT-PSS ECD shows satisfactory optical memory (the transmittance change is less than 2.9% in the colored state) and high coloration efficiency (512.6 cm2 C−1) at 627 nm.
Highlights
Electrochromism refers to when electroactive species undergo a reversible change in optical absorption properties during the electrochemical oxidation/reduction process, and the species are electrochromic materials [1,2,3]
Five electrochromic device (ECD) consisted of PDTC, P(DTC-co-BTP), P(DTC-co-BTP2), P(DTC-co-TF), or P(DTC-co-TF2) as the anodic membrane, and PEDOT-PSS as the cathodic membrane were built and their spectroelectrochemical behaviors, electrochromic switching kinetics, and redox stability were explored in detail
P(DTC-co-TF)/PEDOT-PSS and P(DTC-co-TF2)/ PEDOT-PSS ECDs showed better cycling stability than those of P(DTC-coBTP)/PEDOT-PSS and P(DTC-co-BTP2)/PEDOT-PSS ECDs, displaying ECDs employed 2-(2-thienyl)furan-containing P(DTC-co-TF) (or P(DTC-co-TF2)) as anodic layer led to a better cycling stability than that of 2,2 -bithiophene-containing P(DTC-co-BTP) (or P(DTCco-BTP2))
Summary
Electrochromism refers to when electroactive species undergo a reversible change in optical absorption properties during the electrochemical oxidation/reduction process, and the species are electrochromic materials [1,2,3]. A homopolymer (PDTC), two 2,2 -bithiophene (BTP)-based copolymers (P(DTC-co-BTP) and P(DTC-co-BTP2)), and two 2-(2-thienyl) furan (TF)-based copolymers (P(DTC-co-TF) and P(DTC-co-TF2)) with different DTC/BTP and DTC/TF feed molar ratios are synthesized electrochemically to explore their promising applications in electrochromic products. It is interesting to explore the difference of electrochromic behaviors for 2,2 -bithiopheneand 2-(2-thienyl)furan-based polymer membranes. Five ECDs consisted of PDTC, P(DTC-co-BTP), P(DTC-co-BTP2), P(DTC-co-TF), or P(DTC-co-TF2) as the anodic membrane, and PEDOT-PSS as the cathodic membrane were built and their spectroelectrochemical behaviors, electrochromic switching kinetics, and redox stability were explored in detail. Tphoenesnpteccetlrlo. eTlhecetwroocrhkeimngicealel cetxropdeer,imcoeunnttseroef lpecotlryomdee,rafnidlmresfearnedncEeCelDecstrwoderee wmeeraesaunreIdTOuscionagteadngellaescstrpolcahtee,maicpalal twinourmkstwatiiroen, aannddaanJAAgS/CAOgVC-l6e3l0ecUtrVod-Ve,isriebslpeescptievcetrlyo.Tphheostpomecetrtoeer.lectrochemical experiments of polymer films and ECDs were measured using an electrochemical workstation and a JASCO V-630 UV-Visible spectrophotometer
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