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

Shi Ming Wang; Yuhao Wang; Tao Wang; Zhengbo Han; Cheolhyun Cho; Eunkyoung Kim

doi:10.1002/admt.202000326

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

Shi Ming Wang, Yuhao Wang, Tao Wang, Zhengbo Han, Cheolhyun Cho, Eunkyoung Kim

Department of Chemical and Biomolecular Engineering

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

8 Citations (Scopus)

Abstract

A nonaqueous charge-balancing electrolyte with a redox couple (I⁻/I₃⁻) is investigated to improve the electrochromic (EC) performance of polyoxometalate (POM)-based electrochromic devices (ECDs). PW₁₂O₄₀³⁻ (PW₁₂)-coated porous TiO₂ nanoparticle films (PWTNF) with different thicknesses are used as the working electrode. The optical contrast (ΔT) of the optimized PW₁₂-ECDs reached 59.4% with the electrolyte containing the I⁻/I₃⁻ redox couple. PW₁₂-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⁻/I₃⁻ redox couple, PW₁₂-ECDs show a poor ΔT of 4.0% and slow response times (>9.0 s). The role of the I⁻/I₃⁻ couple is identified as a charge-balancing redox mediator between PW₁₂ and the counter electrode. Li⁺ is the effective intercalating/deintercalating cation required for the EC reaction of PW₁₂. Thus, by simply introducing the I⁻/I₃⁻ redox couple into the electrolyte significantly boosts the EC performance of POMs.

Original language	English
Article number	2000326
Journal	Advanced Materials Technologies
Volume	5
Issue number	10
DOIs	https://doi.org/10.1002/admt.202000326
Publication status	Published - 2020 Oct 1

Bibliographical note

Funding Information:
This research was supported by the National Natural Science Foundation of China (no. 21501084), the General Scientific Research Project of the Educational Department of Liaoning Province (LFW201904), and Global Research Laboratory (GRL) through the National Research Foundation of Korea (NRF) (No. 2016K1A1A2912753).

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

Materials Science(all)
Mechanics of Materials
Industrial and Manufacturing Engineering

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10.1002/admt.202000326

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title = "Charge-Balancing Redox Mediators for High Color Contrast Electrochromism on Polyoxometalates",

abstract = "A nonaqueous charge-balancing electrolyte with a redox couple (I−/I3−) is investigated to improve the electrochromic (EC) performance of polyoxometalate (POM)-based electrochromic devices (ECDs). PW12O403− (PW12)-coated porous TiO2 nanoparticle films (PWTNF) with different thicknesses are used as the working electrode. The optical contrast (ΔT) of the optimized PW12-ECDs reached 59.4% with the electrolyte containing the I−/I3− redox couple. PW12-ECDs also show a fast response time for bleaching (tb,90% = 1.9 s) and coloration (tc,90% = 3.1 s). On the contrary, without the I−/I3− redox couple, PW12-ECDs show a poor ΔT of 4.0% and slow response times (>9.0 s). The role of the I−/I3− couple is identified as a charge-balancing redox mediator between PW12 and the counter electrode. Li+ is the effective intercalating/deintercalating cation required for the EC reaction of PW12. Thus, by simply introducing the I−/I3− redox couple into the electrolyte significantly boosts the EC performance of POMs.",

author = "Wang, {Shi Ming} and Yuhao Wang and Tao Wang and Zhengbo Han and Cheolhyun Cho and Eunkyoung Kim",

note = "Funding Information: This research was supported by the National Natural Science Foundation of China (no. 21501084), the General Scientific Research Project of the Educational Department of Liaoning Province (LFW201904), and Global Research Laboratory (GRL) through the National Research Foundation of Korea (NRF) (No. 2016K1A1A2912753). Publisher Copyright: {\textcopyright} 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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doi = "10.1002/admt.202000326",

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AU - Wang, Shi Ming

AU - Wang, Yuhao

AU - Wang, Tao

AU - Han, Zhengbo

AU - Cho, Cheolhyun

AU - Kim, Eunkyoung

N1 - Funding Information: This research was supported by the National Natural Science Foundation of China (no. 21501084), the General Scientific Research Project of the Educational Department of Liaoning Province (LFW201904), and Global Research Laboratory (GRL) through the National Research Foundation of Korea (NRF) (No. 2016K1A1A2912753). Publisher Copyright: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2020/10/1

Y1 - 2020/10/1

N2 - A nonaqueous charge-balancing electrolyte with a redox couple (I−/I3−) is investigated to improve the electrochromic (EC) performance of polyoxometalate (POM)-based electrochromic devices (ECDs). PW12O403− (PW12)-coated porous TiO2 nanoparticle films (PWTNF) with different thicknesses are used as the working electrode. The optical contrast (ΔT) of the optimized PW12-ECDs reached 59.4% with the electrolyte containing the I−/I3− redox couple. PW12-ECDs also show a fast response time for bleaching (tb,90% = 1.9 s) and coloration (tc,90% = 3.1 s). On the contrary, without the I−/I3− redox couple, PW12-ECDs show a poor ΔT of 4.0% and slow response times (>9.0 s). The role of the I−/I3− couple is identified as a charge-balancing redox mediator between PW12 and the counter electrode. Li+ is the effective intercalating/deintercalating cation required for the EC reaction of PW12. Thus, by simply introducing the I−/I3− redox couple into the electrolyte significantly boosts the EC performance of POMs.

AB - A nonaqueous charge-balancing electrolyte with a redox couple (I−/I3−) is investigated to improve the electrochromic (EC) performance of polyoxometalate (POM)-based electrochromic devices (ECDs). PW12O403− (PW12)-coated porous TiO2 nanoparticle films (PWTNF) with different thicknesses are used as the working electrode. The optical contrast (ΔT) of the optimized PW12-ECDs reached 59.4% with the electrolyte containing the I−/I3− redox couple. PW12-ECDs also show a fast response time for bleaching (tb,90% = 1.9 s) and coloration (tc,90% = 3.1 s). On the contrary, without the I−/I3− redox couple, PW12-ECDs show a poor ΔT of 4.0% and slow response times (>9.0 s). The role of the I−/I3− couple is identified as a charge-balancing redox mediator between PW12 and the counter electrode. Li+ is the effective intercalating/deintercalating cation required for the EC reaction of PW12. Thus, by simply introducing the I−/I3− redox couple into the electrolyte significantly boosts the EC performance of POMs.

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

Abstract

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