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Method for improving cycle stability of polymer electrochromic film

A cycle stability, electrochromic technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of easy peeling off of the film, low mechanical strength, cumbersome steps, etc., achieve no pollution in the preparation process, improve cycle stability, Simple operation effect

Active Publication Date: 2019-12-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the polymer film prepared by electrochemical polymerization has low mechanical strength, is easily broken, and the bonding force between the film and the electrode is weak, and the film is easy to fall off, which leads to the cycle of polymer electrochromic materials and devices. Poor stability
[0004] There are methods to improve the stability of electrochromic thin films through the design of molecular structure and the covalent bond of organic-inorganic materials formed on ITO electrodes, but the modification process is complicated and the steps are cumbersome.

Method used

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  • Method for improving cycle stability of polymer electrochromic film
  • Method for improving cycle stability of polymer electrochromic film
  • Method for improving cycle stability of polymer electrochromic film

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Effect test

Embodiment 1

[0027] Add 0.25g of PEDOT:PSS and 50mL of deionized water into a 100mL beaker, and stir at room temperature until completely dissolved. Filter three times, and store the obtained saturated solution in a centrifuge tube for future use. Then the PEDOT:PSS aqueous solution was spin-coated on the ITO surface at a speed of 3000rpm for 30s, and then dried in an oven at 140°C for 10min to obtain an indium tin oxide glass spin-coated with a PEDOT:PSS film.

Embodiment 2

[0029] A method for modifying the electrode surface to improve the stability of electrochromic thin films, using modified indium tin oxide conductive glass after spin-coating PEDOT:PSS spin-coating as a working electrode, a platinum electrode as an auxiliary electrode, and a silver / silver chloride electrode as a reference The specific electrode is polymerized at a constant voltage of 1.2V in a dichloro solution containing 0.75mol / L TBTPA and 0.1mol / L 1-butyl-3-methylimidazolium tetrafluoroborate. At the end, dedope at a negative potential of -0.6V for 60s, rinse the polymer film deposited on the working electrode with dichloromethane; then dry it in a vacuum oven at 60°C for 4 hours to obtain a PTBTPA film, which is smooth and flat The surface morphology (scanning electron microscope as shown in figure 1 shown).

Embodiment 3

[0031] Morphological characterization, spectroelectrochemical and electrochromic performance tests of the electrochromic thin film, the different applied voltage ranges are 0-1.2V, and different voltages (0V, 0.2V, 0.4V, 0.6V, 0.8V V, 0.9V, 1.0V, 1.1V, 1.2V) UV-visible absorption spectrum (such as figure 2 ), a new absorption peak was generated at 700 nm as the voltage increased, indicating that the film changed from yellow to blue. Using the multi-potential step method, the electrochromic switching response between 0V and 1.1V, the voltage step time is 5s, and the stability test is carried out on the PTBTPA film, and the stability test results of the film are as follows: image 3 shown. Compared to unmodified electrodes (such as Figure 4 ), the PTBTPA film prepared on the electrode modified by PEDOT:PSS showed more excellent cycle stability, that is, after 1000 cycles, the film could maintain an optical contrast of 55%.

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Abstract

The invention discloses a method for improving cycle stability of a polymer electrochromic film. The method comprises the following steps: dissolving poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) in deionized water to obtain a PEDOT:PSS aqueous solution, uniformly coating a transparent conductive electrode with the mixed solution in a rotary drop coating mode, and then carrying out drying to obtain a conductive electrode covered with a PEDOT:PSS film; and in a three-electrode electrolytic cell system, preparing an electrolyte by a monomer, a supporting electrolyte and a mixed solvent, taking the obtained conductive electrode covered with the PEDOT:PSS film as a working electrode, taking a platinum electrode as an auxiliary electrode and taking a silver / silver chlorideelectrode as a reference electrode to carry out an electrochemical polymerization reaction at room temperature by adopting a potentiostatic method, carrying out dedoping for 50-70s under a negative potential from -0.4 to -0.8 after the polymerization is finished to obtain a polymer deposited on the working electrode, and carrying out leaching and drying to obtain the polymer film. The method has the advantages of low cost, simple operation and no pollution in the preparation process.

Description

technical field [0001] The invention belongs to the field of electrochromic polymers, and in particular relates to a method for improving the cycle stability of electrochromic polymer films. Background technique [0002] Polymer electrochromic materials usually have the advantages of easy processing, rich color changes, high optical contrast, and fast response, and have good application prospects in the fields of displays and electronic paper. [0003] However, the polymer film prepared by electrochemical polymerization has low mechanical strength, is easily broken, and the bonding force between the film and the electrode is weak, and the film is easy to fall off, which leads to the cycle of polymer electrochromic materials and devices. Less stable. [0004] There are methods to improve the stability of the electrochromic thin film through the design of the molecular structure and the covalent bond of organic-inorganic materials formed on the ITO electrode, but the modifica...

Claims

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Application Information

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IPC IPC(8): C25B3/00C25B11/04
CPCC25B3/00C25B11/095
Inventor 张诚徐丽斌吕晓静毕茜
Owner ZHEJIANG UNIV OF TECH
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