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Porous tungsten oxide electrochromic film and preparation method thereof

An electrochromic and tungsten oxide technology, applied in the direction of coating, etc., can solve the problems of affecting the electrochromic performance of the film, the destruction of the porous structure, the complicated process, etc., and achieve the effect of excellent electrochromic performance, low cost and simple operation

Active Publication Date: 2021-08-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing porous tungsten oxide film by the above template method is not only complicated and costly, but also the process of removing the template can easily cause damage to the porous structure, thereby affecting the electrochromic performance of the film.

Method used

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  • Porous tungsten oxide electrochromic film and preparation method thereof
  • Porous tungsten oxide electrochromic film and preparation method thereof
  • Porous tungsten oxide electrochromic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Clean the conductive glass substrate: Clean the ITO conductive glass substrate with an area of ​​5cm×5cm (square resistance 7-10Ω) with acetone, ethanol, and deionized water for 10 minutes, and dry it at 60°C to obtain a clean ITO conductive glass substrate. glass substrate.

[0036] 2. Configure electrodeposition solution:

[0037] (1) Weigh 4.596g of tungsten powder and put it into a container.

[0038] (2) Measure 14 mL of hydrogen peroxide solution (mass fraction 30%), pour it into a container with tungsten powder for reaction, and react at room temperature, stirring simultaneously during the reaction.

[0039] (3) When the temperature of the solution after the reaction drops to room temperature, a platinum plate is inserted to catalyze, so that the unreacted hydrogen peroxide is partially decomposed. After 12 hours of catalytic reaction, the platinum sheet was taken out to stop the reaction.

[0040] (4) According to the volume ratio V 水 :V 异丙醇 = Mixed solu...

Embodiment 2

[0052] 1. Clean the conductive glass substrate: Clean the ITO conductive glass substrate with an area of ​​5cm×5cm (square resistance 7-10Ω) with acetone, ethanol, and deionized water for 10 minutes, and dry it at 60°C to obtain a clean ITO conductive glass substrate. glass substrate.

[0053] 2. Configure electrodeposition solution:

[0054] (1) Weigh 4.596g of tungsten powder and put it into a container.

[0055] (2) Measure 18 mL of hydrogen peroxide solution (mass fraction 30%), pour it into a container with tungsten powder, and react at room temperature, stirring simultaneously during the reaction.

[0056] (3) When the temperature of the solution after the reaction drops to room temperature, a platinum plate is inserted to catalyze, so that the unreacted hydrogen peroxide is partially decomposed. After 12 hours of catalytic reaction, the platinum sheet was taken out to stop the reaction.

[0057] (4) According to the volume ratio V 水 :V 异丙醇 = Mixed solution of water...

Embodiment 3

[0073] The surface morphology of the porous tungsten oxide obtained in Example 3 is as follows: figure 1 (e), (f) shown.

[0074] The electrochromic performance of the porous tungsten oxide film prepared in Example 3 was tested, and the results are shown in Table 1. The transmittance of the film at 633nm in the faded state reaches 98.6%, the transmittance in the color-developed state reaches 16.3%, and the optical control range is >80%. more, the cycle stability is significantly reduced.

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Abstract

The invention relates to a porous tungsten oxide electrochromic film and a preparation method thereof. The preparation method comprises the following steps: cleaning a conductive glass substrate; preparing an electro-deposition solution, weighing a certain amount of tungsten powder, adding 30wt% of hydrogen peroxide aqueous solution, enabling the volume of the hydrogen peroxide aqueous solution corresponding to each 1g of tungsten powder to be 3.046-3.916 mL, and continuously stirring in the reaction process; making the unreacted hydrogen peroxide partially decomposed under the catalysis of the platinum sheet; adding a mixed solution of water and isopropanol into the reacted solution, diluting the solution, and continuously stirring to obtain an electro-deposition solution; depositing a tungsten oxide film by adopting a constant voltage method; and performing washing and drying to obtain the porous tungsten oxide electrochromic film. Compared with the prior art, the method adopted by the invention is simple to operate and low in cost, a template agent and complex processes such as heat treatment are not needed, and the prepared film is complete, crack-free, uniform in pore structure, excellent in electrochromic performance and good in cycling stability.

Description

technical field [0001] The invention relates to a preparation method of a porous film, in particular to a porous tungsten oxide electrochromic film and a preparation method thereof. Background technique [0002] Electrochromic glass is an important energy-saving material. It uses the change of the polarity and intensity of the applied electric field to cause the oxidation or reduction reaction of the electrochromic material, thereby causing a reversible change in the color of the glass and realizing the protection against light and solar radiation heat. active dynamic control. Since the electrochromic phenomenon was reported in the 1960s, the smart window based on this mechanism has attracted extensive attention from researchers, and related products have also been initially applied to automatic anti-glare rearview mirrors for cars and porthole glass for aircraft. , car side windows and sunroof glass and display screens, etc. [0003] Among many electrochromic materials, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/34
CPCC03C17/3417C03C2217/231C03C2217/241C03C2217/219C03C2217/70C03C2218/115
Inventor 姚爱华宋艳玲
Owner TONGJI UNIV
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