Energy Saving Electrochromic Polymer Windows with a Highly Transparent Charge‐Balancing Layer

Kim, Young-Hoon; Shin, Haijin; Han, Minsu; Seo, Seogjae; Lee, Woo‐Jae; Na, Jongbeom; Park, Chihyun; Kim, Eunkyoung

doi:10.1002/adfm.201701192

Cited by 86 publications

(72 citation statements)

References 21 publications

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“…As a result, TMPD •+ generated by electrochemical oxidation causes a more effective insertion/extraction of ions with opposite charges to balance the internally created electric fields. Thus, the balanced charge transport in the ECD containing TMPD significantly influences optical modulation and response speed 34,35 . In order to evaluate electrochemical durability of the ECD, cyclic stability was tested from − 1.2 V to 0 V at 590 nm (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Design of intrinsically stretchable and highly conductive polymers for fully stretchable electrochromic devices

Kim

Park

et al. 2020

Sci Rep

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Stretchable materials are essential for next generation wearable and stretchable electronic devices. Intrinsically stretchable and highly conductive polymers (termed ISHCP) are designed with semi interpenetrating polymer networks (semi-IPN) that enable polymers to be simultaneously applied to transparent electrodes and electrochromic materials. Through a facile method of acid-catalyzed polymer condensation reaction, optimized ISHCP films show the highest electrical conductivity, 1406 S/cm, at a 20% stretched state. Without the blending of any other elastomeric matrix, ISHCP maintains its initial electrical properties under a cyclic stretch-release of over 50% strain. A fully stretchable electrochromic device based on ISHCP is fabricated and shows a performance of 47.7% ∆T and high coloration efficiency of 434.1 cm2/C at 590 nm. The device remains at 45.2% ∆T after 50% strain stretching. A simple patterned electrolyte layer on a stretchable electrochromic device is also realized. The fabricated device, consisting of all-plastic, can be applied by a solution process for large scale production. The ISHCP reveals its potential application in stretchable electrochromic devices and satisfies the requirements for next-generation stretchable electronics.

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Section: Resultsmentioning

confidence: 99%

Design of intrinsically stretchable and highly conductive polymers for fully stretchable electrochromic devices

Kim

Park

et al. 2020

Sci Rep

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“…d Schematic diagram of the electrical double layers formed by dopant ions 50 . e Schematic diagram of an EC device containing a TiO 2 layer (BMIL, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; WE, working electrode; CE, counter electrode; RE, reference electrode) 55 . f Mechanism of the charge-balancing effect of the ion storage layer containing TiO 2 and PW 11…”

Section: V-offmentioning

confidence: 99%

“…At the same time, the toxicity of organic Se has always been a controversial issue, which has hindered its use and development. (c) By adjusting the size/amount/structure/properties of the electrolyte and electroactive material in the ion storage layer, the device bistability can also be enhanced within a certain range [55][56][57] . The classic solid (or semisolid) ECD structure is as follows: ITO electrode/EC layer/conducting layer/ion storage layer/ITO electrode.…”

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confidence: 99%

Green revolution in electronic displays expected to ease energy and health crises

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“…[ 1–7 ] Generally, ECDs are assembled with four or five layers, including two transparent conductive electrodes, EC and electrolyte layers, with or without charge‐balancing materials (CBMs). [ 8 ] Compared to organic EC materials, inorganic EC materials feature a higher thermal and photostability. [ 9,10 ] Polyoxometalates (POMs) recently emerged as promising inorganic materials due to their varying structures, high electrochemical activities, and EC performances.…”

Section: Introductionmentioning

confidence: 99%

Charge‐Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates

Wang

et al. 2020

Adv Materials Technologies

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POMs) recently emerged as promising inorganic materials due to their varying structures, high electrochemical activities, and EC performances. [11,12] The most common and widely investigated POM structure is the Keggin structure, which is applied in biochemical, electrochemical, and catalytic areas. [13] However, studies on the EC properties of Keggin-structured POMs are limited, and their reported EC performances were inferior to other POM types. [14] Several attempts were made to improve the EC performance, including modifying the molecular structure or atomic composition, and optimizing the nanostructures [15-19] Notably, for POM-based EC materials, these approaches were employed by simultaneously selecting and controlling their nanostructures. Porous TiO 2 nanoparticle films (TNFs) are successful POMs' hosts displaying satisfactory EC performances due to their large specific surface area and porous morphology. [20-23] Further increases in ΔT were obtained by assisting the EC reaction by charge-balancing species between the working and counter electrodes in a full cell structure. Although some full cell type ECDs were achieved with POMs, [20,23] charge-balancing reactions were rarely examined, possibly because of the complicated EC mechanism, which makes it difficult to select CBMs for POMs. To create a CBM, a redox active material or electron reservoir was coated on the counter electrode (film type) or dissolved in the electrolyte (solution type). To simplify the ECD structure and avoid increasing its thickness, the solution type could be promising for high-performance ECDs. For example, a WO 3-based ECD showed enhanced EC performance when it was assembled with an electrolyte containing a tetramethylthiourea redox couple. [24,25] Similarly, viologen-based ECDs displayed fast switching times and high cycling stability in the presence of an I − /I 3 − redox mediator in a gelatin-electrolyte. [26,27] However, POM-based ECDs with redox couples in the electrolyte are not reported in literature. Noticeably, POM-based ECDs suffer from limited electrolyte choices and low optical contrast (ΔT), and POM-based EC films are mainly operated in aqueous media. [28] Also, the limited electrochemical window (1.23 V) of the aqueous electrolyte restricted their broader application in ECDs. [29] In general, water can be electrolyzed, but generates bubbles at the voltage range for coloration and bleaching of EC materials. In a A nonaqueous charge-balancing electrolyte with a redox couple (I − /I 3 −) is investigated to improve the electrochromic (EC) performance of polyoxometalate (POM)-based electrochromic devices (ECDs). PW 12 O 40 3− (PW 12)-coated porous TiO 2 nanoparticle films (PWTNF) with different thicknesses are used as the working electrode. The optical contrast (ΔT) of the optimized PW 12-ECDs reached 59.4% with the electrolyte containing the I − /I 3 − redox couple. PW 12-ECDs also show a fast response time for bleaching (t b,90% = 1.9 s) and coloration (t c,90% = 3.1 s). On the contrary, without the I − /I 3 − redox ...

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Energy Saving Electrochromic Polymer Windows with a Highly Transparent Charge‐Balancing Layer

Cited by 86 publications

References 21 publications

Design of intrinsically stretchable and highly conductive polymers for fully stretchable electrochromic devices

Design of intrinsically stretchable and highly conductive polymers for fully stretchable electrochromic devices

Green revolution in electronic displays expected to ease energy and health crises

Charge‐Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates

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