Use of polymer/ionic liquid plasticizers as gel electrolytes in electrochromic devices

Bircan, H; Seshadri, Venkataramanan; Padilla, Javier; Invernale, Michael A.; Otero, Toribio F.; Sotzing, Gregory A.

doi:10.1088/1742-6596/127/1/012011

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The manufacture of the electrochromic windows is based on references [ 1 , 25 , 26 ]. However, the electropolymerization was carried out with a self-made potentiostat and a self-made electrosynthesis cell.…”

Section: Methodsmentioning

confidence: 99%

Thin Polymer Films by Oxidative or Reductive Electropolymerization and Their Application in Electrochromic Windows and Thin-Film Sensors

et al. 2023

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Electrically conducting and semiconducting polymers represent a special and still very attractive class of functional chromophores, especially due to their unique optical and electronic properties and their broad device application potential. They are potentially suitable as materials for several applications of high future relevance, for example flexible photovoltaic modules, components of displays/screens and batteries, electrochromic windows, or photocatalysts. Therefore, their synthesis and structure elucidation are still intensely investigated. This article will demonstrate the very fruitful interplay of current electropolymerization research and its exploitation for science education issues. Experiments involving the synthesis of conducting polymers and their assembly into functional devices can be used to teach basic chemical and physical principles as well as to motivate students for an innovative and interdisciplinary field of chemistry.

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Section: Methodsmentioning

confidence: 99%

Thin Polymer Films by Oxidative or Reductive Electropolymerization and Their Application in Electrochromic Windows and Thin-Film Sensors

et al. 2023

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“…34 Previously, complementary ECD based on organic polymers such as cathodically coloring poly(3,4ethylenedioxythiophene) (PEDOT) and anodically coloring bis(3,4-ethylenedioxythiophene)-N-methylcarbazole (PBE-DOT-NMCz) were reported. 35 The oxidized form of PEDOT and the reduced form of PBEDOT-NMCz constitute the bleached state. Both reduced PEDOT and oxidized PBEDOT-NMCz show a dark blue color.…”

Section: Introductionmentioning

confidence: 99%

“…Combining NiHCF with cathodically coloring Fe(II)-based metallo-supramolecular polymer results in a durable complementary ECD with low energy consumption . Previously, complementary ECD based on organic polymers such as cathodically coloring poly(3,4-ethylenedioxythiophene) (PEDOT) and anodically coloring bis(3,4-ethylenedioxythiophene)- N -methylcarbazole (PBEDOT-NMCz) were reported . The oxidized form of PEDOT and the reduced form of PBEDOT-NMCz constitute the bleached state.…”

Section: Introductionmentioning

confidence: 99%

Nonconventional Symmetric Double-Side Electrochromic Devices Employing a Nafion Conductive Layer to Unlock Superior Durability

DiPalo,

Ahmad,

Ebralidze

et al. 2023

ACS Appl. Mater. Interfaces

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In this work, we present a methodology to create an effective novel double-sided symmetric architecture of solid-state electrochromic devices. This principally new nonconventional configuration provides access to novel electrochromic systems that could be applicable for the creation of smart double-side signage, smart boards, nonemissive displays, and other smart interactive devices that change their color upon application of a voltage. The proposed configuration is based on the assembly of two identical electrochromic materials facing each other through an opaque optical separator. As a proof of concept, we use an electrochromic material based on bis(4′-(pyridin-4-yl)-2,2′:6′,2″-terpyridine) iron complex, covalently immobilized on screenprinted surface-extended ITO support. The symmetric configuration allows for a drastic enhancement of the overall stability of the device due to both attenuation of the counter electrode polarization and minimization of electrolyte decomposition. A nontransparent ion-permeable separator, in turn, allows observing the color change of only one of the electrodes by cutting off the optical contribution of the electrode located behind it. Further functionalization of the electrochromic material with a thin layer of Nafion is a beneficial strategy to significantly boost up long-term durability of the devices. Applying a layer of Nafion to the electrochromic material results in an increase in ionic conductivity within the device and ensures better retention of electrochromic molecules on the surface, thus minimizing device decomposition during long-term electrochemical cycling. An electrochromic device that bears Nafion-functionalized electrodes can operate (i) in the dual-side mode, where both sides demonstrate effective electrochromic performance; or (ii) in a one-side manner, where only one side of the device changes color. Notably, when operating in the one-side mode, the device withstands 70,000 cycles, after which the performance of the device can be resumed by simply turning the device to the other side (via switching the polarity of the electrodes).

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“…Hence, in this work, LiTFSI salt is doped into PEO since it has a bulky anion, which suppresses crys-tallization of the polymer [6] and it has low dissociation energy so that it can easily be dissociated into ions, which in turn contribute to ionic conductivity enhancement. The polymer electrolyte PEO-LiTFSI is also incorporated with ionic liquid as plasticizer, which is thought to enhance both ionic conductivity and safety of the polymer electrolyte at the same time [7]. The ionic liquid helps to dissociate more salt leading to higher ionic conductivity since it increases the amorphous region, dissociate ion aggregates and lowers the glass transition tempearature [8].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Studies of PEO-based Polymer Electrolytes Doped with LiTFSI Salt and EMIMTFSI Ionic Liquid

Hashim¹,

Subban²

2019

IJET

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In this work, poly (ethylene oxide) (PEO) is doped with Lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) salt and 1-Ethyl-3-methylimidazolium bis (trifluromethanesulfonyl) imide (EMIm-TFSI) ionic liquid, a plasticiser, for preparation of PEO-LiTFSI-EMImTFSI plasticised polymer electrolyte (PPE) system. Impedance spectroscopy is used to analyse the dependence of dielectric behaviour of the films on frequency and temperature. It is performed in the temperature range between 303K to 343K for frequencies between 50 Hz to 1 MHz. The cationic transport in the films may be explained from the dielectric constant, ԑr and dielectric loss, ԑi where they are found to increase with temperature at lower frequency and decrease at higher frequency, showing that the electrodes were being polarized. Both real parts, Mr and imaginary part, Mi of the modulus showed an increase at high frequency that indicates the spread of conductivity relaxation. The highest temperature (343K) achieved the lowest relaxation time, τ due to increase in number of ions and increase in mobility of ions in the polymer system indicating that conductivity in this system is thermally activated.

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Use of polymer/ionic liquid plasticizers as gel electrolytes in electrochromic devices

Cited by 11 publications

References 11 publications

Thin Polymer Films by Oxidative or Reductive Electropolymerization and Their Application in Electrochromic Windows and Thin-Film Sensors

Thin Polymer Films by Oxidative or Reductive Electropolymerization and Their Application in Electrochromic Windows and Thin-Film Sensors

Nonconventional Symmetric Double-Side Electrochromic Devices Employing a Nafion Conductive Layer to Unlock Superior Durability

Dielectric Studies of PEO-based Polymer Electrolytes Doped with LiTFSI Salt and EMIMTFSI Ionic Liquid

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