Isomeric effects of poly-viologens on electrochromic performance and applications in low-power electrochemical devices

Ye Ryeong In; Hyo Jin Park; Jin Han Kwon; Yong Min Kim; Keon Woo Kim; Devesh K. Pathak; Se Hyun Kim; Seung Woo Lee; Hong Chul Moon

doi:10.1016/j.solmat.2022.111734

Isomeric effects of poly-viologens on electrochromic performance and applications in low-power electrochemical devices

Ye Ryeong In, Hyo Jin Park, Jin Han Kwon, Yong Min Kim, Keon Woo Kim, Devesh K. Pathak, Se Hyun Kim, Seung Woo Lee, Hong Chul Moon

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Electrochromic (EC) behaviors of poly-viologens are tuned by selecting positions (ortho (o), meta (m), and para (p)) of the benzene rings linked to 4,4′-bipyridine. All-in-one type EC devices (ECDs) are conveniently fabricated by adding poly-viologens to highly conductive solid-state polymeric gel electrolytes. The maximum transmittance contrast (ΔT) of the o-poly-viologen based ECD is much lower than that of the other isomers, and its bleaching is not reversible, whereas a large ΔT and high stability are achieved with the m- and p-poly-viologens. Considering the high solubility of the m-poly-viologen in ion gels, it is anticipated to have a larger hydrodynamic size, leading to low diffusivity (∼1.1 × 10⁻¹² cm²/s for cationic and ∼2.7 × 10⁻¹² cm²/s for anionic current). As a result, the m-poly-viologen ECD shows a superior memory effect and long-lasting colored state without voltage supply. This feature allows us to demonstrate a low-power ECD based on the m-poly-viologen, which only requires ∼3.54 μW/cm² to maintain the transmittance below 30%. The results indicate that adjusting the isomeric molecular structure of poly-viologen EC chromophores is an effective way to control their EC performance.

Original language	English
Article number	111734
Journal	Solar Energy Materials and Solar Cells
Volume	240
DOIs	https://doi.org/10.1016/j.solmat.2022.111734
State	Published - 15 Jun 2022

Keywords

Electrochromism
Ion gels
Isomers
Low-power displays
Poly-viologens

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.solmat.2022.111734

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@article{dfe49dfbc8d448c39379db35fe6e35c4,

title = "Isomeric effects of poly-viologens on electrochromic performance and applications in low-power electrochemical devices",

abstract = "Electrochromic (EC) behaviors of poly-viologens are tuned by selecting positions (ortho (o), meta (m), and para (p)) of the benzene rings linked to 4,4′-bipyridine. All-in-one type EC devices (ECDs) are conveniently fabricated by adding poly-viologens to highly conductive solid-state polymeric gel electrolytes. The maximum transmittance contrast (ΔT) of the o-poly-viologen based ECD is much lower than that of the other isomers, and its bleaching is not reversible, whereas a large ΔT and high stability are achieved with the m- and p-poly-viologens. Considering the high solubility of the m-poly-viologen in ion gels, it is anticipated to have a larger hydrodynamic size, leading to low diffusivity (∼1.1 × 10−12 cm2/s for cationic and ∼2.7 × 10−12 cm2/s for anionic current). As a result, the m-poly-viologen ECD shows a superior memory effect and long-lasting colored state without voltage supply. This feature allows us to demonstrate a low-power ECD based on the m-poly-viologen, which only requires ∼3.54 μW/cm2 to maintain the transmittance below 30%. The results indicate that adjusting the isomeric molecular structure of poly-viologen EC chromophores is an effective way to control their EC performance.",

keywords = "Electrochromism, Ion gels, Isomers, Low-power displays, Poly-viologens",

author = "In, {Ye Ryeong} and Park, {Hyo Jin} and Kwon, {Jin Han} and Kim, {Yong Min} and Kim, {Keon Woo} and Pathak, {Devesh K.} and Kim, {Se Hyun} and Lee, {Seung Woo} and Moon, {Hong Chul}",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2022",

month = jun,

day = "15",

doi = "10.1016/j.solmat.2022.111734",

language = "English",

volume = "240",

journal = "Solar Energy Materials and Solar Cells",

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TY - JOUR

T1 - Isomeric effects of poly-viologens on electrochromic performance and applications in low-power electrochemical devices

AU - In, Ye Ryeong

AU - Park, Hyo Jin

AU - Kwon, Jin Han

AU - Kim, Yong Min

AU - Kim, Keon Woo

AU - Pathak, Devesh K.

AU - Kim, Se Hyun

AU - Lee, Seung Woo

AU - Moon, Hong Chul

PY - 2022/6/15

Y1 - 2022/6/15

N2 - Electrochromic (EC) behaviors of poly-viologens are tuned by selecting positions (ortho (o), meta (m), and para (p)) of the benzene rings linked to 4,4′-bipyridine. All-in-one type EC devices (ECDs) are conveniently fabricated by adding poly-viologens to highly conductive solid-state polymeric gel electrolytes. The maximum transmittance contrast (ΔT) of the o-poly-viologen based ECD is much lower than that of the other isomers, and its bleaching is not reversible, whereas a large ΔT and high stability are achieved with the m- and p-poly-viologens. Considering the high solubility of the m-poly-viologen in ion gels, it is anticipated to have a larger hydrodynamic size, leading to low diffusivity (∼1.1 × 10−12 cm2/s for cationic and ∼2.7 × 10−12 cm2/s for anionic current). As a result, the m-poly-viologen ECD shows a superior memory effect and long-lasting colored state without voltage supply. This feature allows us to demonstrate a low-power ECD based on the m-poly-viologen, which only requires ∼3.54 μW/cm2 to maintain the transmittance below 30%. The results indicate that adjusting the isomeric molecular structure of poly-viologen EC chromophores is an effective way to control their EC performance.

AB - Electrochromic (EC) behaviors of poly-viologens are tuned by selecting positions (ortho (o), meta (m), and para (p)) of the benzene rings linked to 4,4′-bipyridine. All-in-one type EC devices (ECDs) are conveniently fabricated by adding poly-viologens to highly conductive solid-state polymeric gel electrolytes. The maximum transmittance contrast (ΔT) of the o-poly-viologen based ECD is much lower than that of the other isomers, and its bleaching is not reversible, whereas a large ΔT and high stability are achieved with the m- and p-poly-viologens. Considering the high solubility of the m-poly-viologen in ion gels, it is anticipated to have a larger hydrodynamic size, leading to low diffusivity (∼1.1 × 10−12 cm2/s for cationic and ∼2.7 × 10−12 cm2/s for anionic current). As a result, the m-poly-viologen ECD shows a superior memory effect and long-lasting colored state without voltage supply. This feature allows us to demonstrate a low-power ECD based on the m-poly-viologen, which only requires ∼3.54 μW/cm2 to maintain the transmittance below 30%. The results indicate that adjusting the isomeric molecular structure of poly-viologen EC chromophores is an effective way to control their EC performance.

KW - Electrochromism

KW - Ion gels

KW - Isomers

KW - Low-power displays

KW - Poly-viologens

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DO - 10.1016/j.solmat.2022.111734

M3 - Article

AN - SCOPUS:85127534816

SN - 0927-0248

VL - 240

JO - Solar Energy Materials and Solar Cells

JF - Solar Energy Materials and Solar Cells

M1 - 111734

ER -

Isomeric effects of poly-viologens on electrochromic performance and applications in low-power electrochemical devices

Abstract

Keywords

UN SDGs

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