Method for preparing titanium-doped multistage porous silica/nano tungsten oxide composite electrochromic thin film

A nano-tungsten oxide and silicon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, tungsten oxide/tungsten hydroxide, etc., can solve the problem of slow response speed of film discoloration, limited electrochromic film, unfavorable ion diffusion and electron interference Transmission and other issues, to achieve excellent electrochromic performance, simplify the process, improve the effect of electrochemical and optical properties

Active Publication Date: 2020-02-18
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, pure tungsten oxide films generally exist in a dense structure, which is not conducive to the diffusion of ions and the transmission of electrons during the electrochromic process, resulting in a slow response speed of the film's discoloration, which limits the practical application of tungsten oxide electrochromic films.

Method used

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  • Method for preparing titanium-doped multistage porous silica/nano tungsten oxide composite electrochromic thin film
  • Method for preparing titanium-doped multistage porous silica/nano tungsten oxide composite electrochromic thin film
  • Method for preparing titanium-doped multistage porous silica/nano tungsten oxide composite electrochromic thin film

Examples

Experimental program
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Embodiment 1

[0043] This embodiment provides a method for preparing a titanium-doped hierarchical porous silica / nano-tungsten oxide composite electrochromic film, which specifically includes the following steps:

[0044] S1. Preparation of composite mesogen template: Dissolve 0.54g cetylpyridinium chloride monohydrate and 4g polyacrylic acid in 25mL molecular water to form a transparent mixed solution, add 4g ammonia water to the mixed solution to obtain composite mesogen template;

[0045]S2. Preparation of titanium-doped hierarchical porous silica microspheres: sequentially mix 2.08g tetraethyl orthosilicate and 1.67mL peroxotitanic acid solution (the preparation method of peroxotitanic acid is as follows: add 0.01mol (1.60 g) sulfuric acid oxygen Dissolve titanium in 25mL molecular water, add 0.04mmol hydrogen peroxide at 2°C, and continue to stir for 2 hours to obtain a peroxotitanic acid solution) Add the complex mesogenic template to form an emulsion, and transfer the emulsion into a...

Embodiment 2

[0050] This embodiment provides a method for preparing a titanium-doped hierarchical porous silica / nano-tungsten oxide composite electrochromic film, which specifically includes the following steps:

[0051] S1. Preparation of composite mesogen template: Dissolve 0.54g cetylpyridinium chloride monohydrate and 4g polyacrylic acid in 25mL molecular water to form a transparent mixed solution, add 4g ammonia water to the mixed solution to obtain composite mesogen template;

[0052] S2. Preparation of titanium-doped hierarchical porous silica microspheres: sequentially mix 2.08 g of tetraethyl orthosilicate and 1.67 mL of peroxotitanic acid solution (the preparation method of peroxotitanic acid is as follows: add 0.01 mol (1.60 g) of sulfuric acid oxygen Dissolve titanium in 25mL molecular water, add 0.04mmol hydrogen peroxide at 2°C, and continue to stir for 2 hours to obtain a peroxotitanic acid solution) Add the complex mesogenic template to form an emulsion, and transfer the em...

Embodiment 3

[0057] This example provides a method for preparing a titanium-doped hierarchical porous silica / nano-tungsten oxide composite electrochromic film. The specific operation steps refer to Example 1, and the differences from Example 1 are as follows:

[0058] S4. Preparation of electrochemical deposition solution: dissolve 0.99g tungsten chloride in 100mL molecular water and stir for 2h, then add 2.8mL hydrogen peroxide and 1.2mL nitric acid in turn, with an interval of 30min, and then stir for 30min to form a peroxytungstic acid solution. Add 0.20 g of titanium-doped hierarchical porous silica microspheres to the solution to obtain an electrochemical deposition solution;

[0059] S5. Constant potential deposition: use the FTO conductive glass cleaned in step S3 as the working electrode, Ag / AgCl as the reference electrode, and the platinum sheet as the counter electrode, and use a three-electrode system to deposit at a constant potential of -0.8V for 5 minutes. After completion, r...

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Abstract

The invention discloses a method for preparing a titanium-doped multistage porous silica / nano tungsten oxide composite electrochromic thin film. The method comprises the following steps: preparing a composition mesocrystal mold plate, preparing titanium-doped multistage porous silica microspheres, cleaning a working electrode, preparing an electrochemical deposition liquid, and performing constantpotential deposition, so as to obtain the titanium-doped multistage porous silica / nano tungsten oxide composite electrochromic thin film. As titanium-doped multistage porous silica is introduced intoa nano tungsten oxide thin film, the prepared titanium-doped multistage porous silica / nano tungsten oxide composite electrochromic thin film has a conspicuous porous structure when being compared with a pure nano tungsten oxide thin film, and the specific surface area of the composite thin film can be remarkably increased; and in addition, due to introduction of titanium, active sites are provided for the composite thin film, diffusion routes of ions and electrons in the composite thin film can be shortened, rapid embedding and dissociation of the ions and the electrons can be facilitated, and the optical modulation range, the coloring efficiency and the circulation stability of the composite thin film can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of functional materials and electrochromic thin films, and more specifically, to a method for preparing a titanium-doped hierarchical porous silicon dioxide / nano-tungsten oxide composite electrochromic thin film. Background technique [0002] Electrochromic material is a special material, under the action of an external electric field, the optical properties of the material such as transmittance, reflectivity and absorptivity can undergo stable and reversible changes. This unique property makes it widely used in digital displays, automotive anti-glare rearview mirrors, and smart windows. [0003] Tungsten oxide electrochromic materials have been widely studied by researchers because of their advantages of large optical contrast, wide source of raw materials and low cost. The electrochromic principle of tungsten oxide is that under the action of an external electric field, ions (Li + , H + ) and electrons ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01G41/02C25D15/00
CPCC01B33/18C01G41/02C25D15/00C01P2002/85C01P2004/03C01P2004/01
Inventor 杜晶晶宋娅许利剑许建雄
Owner HUNAN UNIV OF TECH
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