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A kind of tungsten trioxide nanobowl electrochromic material and preparation method thereof

An electrochromic material, tungsten trioxide technology, applied in the direction of coating, etc., can solve the problems of slow response speed, poor metastable structure, poor chemical stability and cycle life

Active Publication Date: 2021-09-10
合肥庐阳科技创新集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, optical contrast, response time, cycling stability, and some other electrochromic performance indicators are still unsatisfactory, especially for bulk WO. 3 For the compact structure, the ion transport capacity is limited
It is well known that the degree of crystallinity in WO 3 plays a crucial role in the electrochromic properties of the amorphous WO 3 In general, its large capacity for small ions means high optical modulation capability, and its multi-type transport channels and thermally induced defects associated with oxygen vacancies ensure a high ion diffusion coefficient, making color switching fast, but its sub- Steady-state structure and poor chemical stability lead to poor cycle life
On the other hand, crystalline WO 3 It has high electrical conductivity and stable microstructure, which makes it have good chemical stability and structural stability, but its dense structure leads to relatively low diffusion coefficient and relatively slow response speed

Method used

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  • A kind of tungsten trioxide nanobowl electrochromic material and preparation method thereof
  • A kind of tungsten trioxide nanobowl electrochromic material and preparation method thereof
  • A kind of tungsten trioxide nanobowl electrochromic material and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a preparation method of the tungsten trioxide nanobowl electrochromic material described in the above technical solution, comprising the following steps:

[0036] Mixing the polystyrene microsphere dispersion, ethanol and acetone to obtain a suspension;

[0037] Put water and FTO conductive glass into a petri dish, drop the suspension and triton into the water surface in turn, then take out the FTO conductive glass, and dry it naturally to obtain FTO conductive glass wrapped by a single-layer PS sphere film;

[0038] Na 2 WO 4 Powder, H 2 o 2 After the solutions are mixed, the pH value is adjusted to 1.0-2.0 with perchloric acid to obtain an electrolyte solution;

[0039] The FTO conductive glass wrapped by the single-layer PS spherical film is used as the working electrode, the platinum wire is used as the counter electrode, and the Ag / AgCl electrode is used as the reference electrode, and the working electrode is pulse-deposited...

Embodiment 1

[0057] (1) Place the FTO conductive glass in acetone, ethanol, and deionized water for ultrasonic cleaning in sequence, and dry it in a vacuum oven after cleaning.

[0058] (2) Mix PS sphere dispersion with a diameter of 500nm (8% concentration, dispersed in deionized water) with ethanol and acetone at a ratio of 5:5:2, ultrasonically disperse to form a milky white suspension, take a clean culture Fill the dish with deionized water and cleaned FTO conductive glass, take a little of the above milky white suspension and drop it on the deionized surface under the guidance of the glass slide, and drop a few drops of Triton diluted 100 times on the deionized water On the surface, a single layer of dense PS sphere film is formed, and then the FTO conductive glass is pulled out, and after natural drying, a single layer of PS sphere film is formed.

[0059] (3) Na under magnetic stirring 2 WO 4 Powder dissolved in 0.4wt% H 2 o 2 solution, forming 12.5mM H 2 WO 4 The solution was...

Embodiment 2

[0066] A preparation method of a tungsten trioxide nanobowl electrochromic material, the specific steps are as follows:

[0067] (1) Place the FTO conductive glass in acetone, ethanol, and deionized water for ultrasonic cleaning in sequence, and dry it in a vacuum oven after cleaning.

[0068] (2) Mix PS sphere dispersion with a diameter of 500nm (8% concentration, dispersed in deionized water) with ethanol and acetone at a ratio of 5:5:2, ultrasonically disperse to form a milky white suspension, take a clean culture Fill the dish with deionized water and cleaned FTO conductive glass, take a little of the above milky white suspension and drop it on the deionized surface under the guidance of the glass slide, and drop a few drops of Triton diluted 100 times on the deionized water On the surface, a single layer of dense PS sphere film is formed, and then the FTO conductive glass is pulled out, and naturally dried in the air to form a single layer of PS sphere film.

[0069] (3)...

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Abstract

The invention provides a tungsten trioxide nanobowl electrochromic material and a preparation method thereof, belonging to the field of electrochromic thin films. The electrochromic material of the present invention has a hierarchical porous structure. The tungsten trioxide nanobowl electrochromic material is based on FTO conductive glass, and the surface of the substrate is wrapped with the bottom layer and the outer layer in turn, and the bottom layer is crystalline tungsten trioxide. , using amorphous tungsten trioxide as the outer layer, the outer layer has a porous structure and contains independently dispersed micro-domain crystalline structures, and the outer layer is distributed with tungsten trioxide crystal nuclei with a diameter of 2-5 nm. The invention realizes the combination of crystalline and amorphous tungsten trioxide on the nanoscale, greatly improves the electrochromic performance, realizes complementary advantages, increases the specific surface area of ​​the nanobowl electrochromic material, and significantly enhances the discoloration reaction The kinetic process, thereby improving the electrochromic performance.

Description

technical field [0001] The invention relates to the technical field of electrochromic thin films, in particular to a tungsten trioxide nanobowl electrochromic material and a preparation method thereof. Background technique [0002] Electrochromic materials have attracted much attention due to their tunable and reversible modulation of optical properties (transmittance, absorbance, or reflectance) driven by low voltages, and are promising materials for energy-saving applications. WO 3 The electrochromic material has received extensive attention because it consists of a three-dimensional network of WO 6 The octahedral composition, which can provide abundant channels for transporting small ions, facilitates switchable color changes, and is also suitable for outdoor applications due to good environmental stability. However, so far, optical contrast, response time, cycling stability, and some other electrochromic performance indicators are still unsatisfactory, especially for b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34C03C17/25C03C17/245
CPCC03C17/006C03C17/245C03C17/25C03C17/3417C03C2217/425C03C2217/70C03C2217/94C03C2218/115C03C2218/155
Inventor 张勇史英迪汤凯宋艳斌崔接武王岩秦永强舒霞吴玉程
Owner 合肥庐阳科技创新集团有限公司
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