Synthesis of high-performance electrochromic material for facile fabrication of truly black electrochromic devices

Li, Fangwei; Yen, Tzu-Chieh; Liou, Guey‐Sheng

doi:10.1016/j.electacta.2020.137474

Cited by 33 publications

(16 citation statements)

References 38 publications

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“…This may be the reason why the volume ratio of the AA and DEAM is 1:1, the compatibility between the polymer and the solvent is optimal—forming a compatible gel system which exhibits high transparency [ 32 ]—and its optical transmittance exceeds 98% in the range of 610–800 nm, and reaches 99.88% at 800 nm. However, the transmittance of some organic polymer gel electrolytes such as PEO and PI is within 80–90% [ 33 , 34 , 35 , 36 , 37 , 38 ]. The high transmittance of the gel electrolyte is better used in electrochromic devices; the difference in transmittance or reflectivity between the colored state and the bleached state of the electrochromic device can be clearly observed.…”

Section: Resultsmentioning

confidence: 99%

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

Chen

Zhang

et al. 2022

Polymers

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Most ECDs are coated with an electrochromic material on the transparent conductive oxide (TCO) substrate. A novel electrochromic device (ECD), having a variable optical performance, was prepared by using tungsten foil as a substrate in this study. It was found that the WO3 discoloration layer, having a monoclinic phase crystalline structure made of 600 °C calcined, had optimum charge transmission performance with PADA gel polymer electrolyte. Ionic conductivity of PADA gel polymer electrolyte was 2.3 × 10−3 S cm−1 at −20 °C, and it was possible to help Li+ to implement embedding and extraction from WO3 even in low-temperature conditions. The colored time (tc) and the bleached time (tb) of the electrochromic device were 15 s and 26 s, and it showed yellowish-brown in the colored state and navy blue in the bleached state. The ECD (WO3-600) exhibited good cycle stability reach at least 150 times.

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Section: Resultsmentioning

confidence: 99%

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

Chen

Zhang

et al. 2022

Polymers

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“…50 The preparation of AgNW/ TPPA hybrid electrodes is similar to our previous reports, as shown in Figure S4, with a film thickness of about 200 nm. 18,53 The fabrication of ECDs based on AgNW/TPPA hybrid electrodes was according to our previous report. 47 Finally, the fabricated ECDs were used for the experiment.…”

Section: Methodsmentioning

confidence: 99%

“…The cathodic EC material, heptyl viologen tetrafluoroborate HV(BF 4 ) 2 , and the electrolyte tetrabutylammonium tetrafluoroborate (TBABF 4 ) was prepared as our previous report . The preparation of AgNW/TPPA hybrid electrodes is similar to our previous reports, as shown in Figure S4, with a film thickness of about 200 nm. , The fabrication of ECDs based on AgNW/TPPA hybrid electrodes was according to our previous report . Finally, the fabricated ECDs were used for the experiment.…”

Section: Experimental Sectionmentioning

confidence: 99%

Electroactive Triphenylamine-Based Polymer Films as Passivation Layers for Improving Electrochemical Oxidation Stability of Silver Nanowires

Yen

Manavalan

et al. 2021

ACS Appl. Polym. Mater.

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Silver nanowires (AgNWs) have emerged as a greater promising material for transparency-based electrodes compared to indium-tin-oxide (ITO) electrodes because of the tunable figures of merit, large-scale processability, and flexibility. However, they still suffered from a crucial problem of instability under the thermal condition, mechanical stimuli, and particularly sustained electrical currents, which is a challenge persisting to date. Here, we demonstrate the improved electrochemical stability of AgNWs by a simple cost-effective electroactive triphenylamine (TPA)-based polymer film as a passivation layer onto the AgNW networks. The AgNW/TPPA hybrid electrode could not only enhance the overall performance including electrical oxidation stability and adhesion to the substrates but also has little effect on transparency contrary to typical passivation films. Besides, the electrochromic behaviors of the obtained AgNW/TPPA hybrid electrode demonstrated obvious multicolor appearance changes during their two oxidation stages. Finally, the AgNW/TPPA hybrid was fabricated as an electrochromic device (ECD) according to the ambipolar conduction behavior. The fabricated ECDs were also used in cyclic and differential pulse voltammetry techniques at a wide-range applied potential for continuous 300 switching cycles, which signifies that our proposed method has long-term operational stability. Thus, our fabrication strategy platform should enable an improved pathway to the development of optoelectronic devices and offer considerable promise for addressing growing concerns of device stability.

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“…5–9 Liou prepared PAs with high contrast transmittance from colorless to black between bleached and colored states when oxidized. 13 Sun synthesized PAs with fast response; 14 Liaw prepared PIs with strong optical contrast. 15 PAs with pyrene, TAA derivatives and spirofluorene as the core synthesized by our group have good physicochemical stability and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

From gas separation to ion transport in the cavity of hyperbranched polyamides based on triptycene aimed for electrochromic and memory devices

et al. 2022

Polym. Chem.

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Synthesis of high-performance electrochromic material for facile fabrication of truly black electrochromic devices

Cited by 33 publications

References 38 publications

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

Study of a Novel Electrochromic Device with Crystalline WO3 and Gel Electrolyte

Electroactive Triphenylamine-Based Polymer Films as Passivation Layers for Improving Electrochemical Oxidation Stability of Silver Nanowires

From gas separation to ion transport in the cavity of hyperbranched polyamides based on triptycene aimed for electrochromic and memory devices

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