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Quasi-solid tungsten trioxide electrochromic device and preparation method thereof

An electrochromic device, tungsten trioxide technology, applied in instruments, nonlinear optics, optics, etc., can solve the problems of unobvious optical contrast, poor cycle performance, long response time, etc., achieve simple process and promote commercialization The development, fast response effect

Inactive Publication Date: 2019-04-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of poor cycle performance, low coloring efficiency, inconspicuous optical contrast, long response time, and high preparation cost of existing electrochromic devices, a quasi-solid-state tungsten trioxide electrochromic device and its preparation method are provided. The invention is realized through the following technical solutions:

Method used

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  • Quasi-solid tungsten trioxide electrochromic device and preparation method thereof
  • Quasi-solid tungsten trioxide electrochromic device and preparation method thereof
  • Quasi-solid tungsten trioxide electrochromic device and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Example 1 Preparation of electrochromic device

[0043] 1. Preparation of tungsten trioxide working electrode:

[0044] Step a: Take 3.3 g Na 2 WO 4 .2H 2 O was dissolved in 76 mL deionized water, the concentration of sodium tungstate solution was 0.13M, and 2 g (NH 4 ) 2 SO 4 , adding hydrochloric acid to adjust the pH to 2.0.

[0045] Step b: Take 60 mL of the solution obtained in step a and place it in a 100 mL reactor, seal it and put it into a blast drying oven for hydrothermal reaction, react at 200 °C for 48 hours, and then dry at 60 °C; obtain WO 3 Nanowire; WO obtained in this step 3 Nanowire scanning electron microscope picture as figure 2 shown, WO 3 The diameter of the nanowire is about 50 nm, which can form a nano-void structure, which is conducive to ion intercalation and extraction, and improves the cycle life of the electrochromic device.

[0046] Step c: Take the WO obtained in step b 3 nanowires, adding isopropanol to form a mixed solution ...

Embodiment 2

[0061] Example 2 Preparation of electrochromic device

[0062] In the preparation method of this example, except for the following steps of preparing the tungsten trioxide working electrode, other steps are the same as in Example 1.

[0063] Preparation of tungsten trioxide working electrode:

[0064] Step a: Take 3.3 g Na 2 WO 4 .2H 2 O was dissolved in 76 mL of deionized water, and hydrochloric acid was added to adjust the pH to 2.0.

[0065] Step b: Take 60 mL of the above solution and place it in a 100 mL reactor, seal it well and put it into a blast drying oven for hydrothermal reaction at a reaction temperature of 200 °C for 48 hours. WO 3 Collect by centrifugation and dry at 60°C.

[0066] Step c: Take the WO obtained in step b 3 , adding isopropanol to form WO 3 A mixed solution with a mass fraction of 0.5% was ultrasonically dispersed for 2 hours to obtain WO 3 Mixed solution, its SEM picture is as follows Figure 5 As shown, it can be seen that without addi...

Embodiment 3

[0069] Example 3 Preparation of electrochromic device

[0070] Except for the following steps of preparing the tungsten trioxide working electrode, other steps are the same as in Example 1.

[0071] Preparation of tungsten trioxide working electrode:

[0072] Step a: Take 3.3 g Na 2 WO 4 .2H2 O was dissolved in 76 mL deionized water, and 2 g (NH 4 ) 2 SO 4 , adding hydrochloric acid to adjust the pH to 2.0.

[0073] Step b: Take 60 mL of the above solution and place it in a 100 mL reactor, seal it well and put it into a blast drying oven for hydrothermal reaction at a reaction temperature of 200 °C for 48 hours. collect WO 3 nanowires, dried at 60 °C.

[0074] Step c: Take the WO obtained in step b 3 For nanowires, add isopropanol to form a mixed solution with a mass fraction of 0.5%, and ultrasonically disperse for 2 hours.

[0075] Step d: Take the solution after ultrasonic dispersion in step c for spraying. The spraying gun model is Taiwan Polaroid spray gun RH-BS...

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Abstract

The invention discloses a quasi-solid tungsten trioxide electrochromic device and a preparation method thereof. The quasi-solid tungsten trioxide electrochromic device comprises a working electrode, an electrolyte layer, a counter electrode and a transparent conducting layer, wherein the working electrode is tungsten oxide, the electrolyte layer is a choline chloride ethylene glycol gel containinglithium salt, and the counter electrode is nano cerium oxide. A tungsten trioxide electrochromic film electrode and a cerium oxide counter electrode are prepared by adopting a spraying method, gel electrolyte is taken as pseudo ionic liquid, the gel electrolyte has the advantages of being low in cost, green and environment-friendly, highly transparent, not easy to leak, and high in ionic conductivity, so that the device prepared by the electrolyte has the characteristics of high response speed, large optical density difference and low cost.

Description

technical field [0001] The invention belongs to the field of preparation of electrochromic thin film devices, in particular to a quasi-solid-state tungsten trioxide electrochromic device and a preparation method thereof. Background technique [0002] Electrochromism refers to the implantation and extraction of electrons and ions under the electrochemical action of the material, which changes the valence state and chemical composition, thereby changing the reflective and transmissive properties of the material. In terms of appearance, it is manifested as color and A reversible change in transparency. Electrochromic materials are divided into inorganic electrochromic materials (transition metal oxides or their derivatives) and organic electrochromic materials (viologens and conductive polymers). The performance of inorganic electrochromic materials is stable, and its light absorption changes are caused by the double injection and double extraction of ions and electrons. Its t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1524G02F1/153
CPCG02F1/1525G02F1/1533
Inventor 窦辉龙雪媛董升阳徐呈旸申来法张校刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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