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Vanadium-doped crystalline tungsten trioxide electrochromic film and preparation method thereof

A tungsten trioxide and electrochromic technology, applied in the direction of coating, can solve the problem of thin film particles and other problems, and achieve the effects of low cost, simple preparation process and simple operation

Pending Publication Date: 2022-03-15
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vanadium-containing tungsten oxide films have better neutral color than pure tungsten oxide films, and are more suitable for electrochromic windows. However, the existing methods for preparing vanadium-doped tungsten trioxide films mainly include magnetron sputtering, pulsed laser Deposition method, involving complex physical and chemical processes, requires vacuum or high temperature, and there are particles on the surface of the film

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  • Vanadium-doped crystalline tungsten trioxide electrochromic film and preparation method thereof
  • Vanadium-doped crystalline tungsten trioxide electrochromic film and preparation method thereof
  • Vanadium-doped crystalline tungsten trioxide electrochromic film and preparation method thereof

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preparation example Construction

[0029] The preparation method specifically includes the following steps: dissolving tungsten source and vanadium source in quantitative deionized water to obtain a mixed solution; adding hydrogen peroxide (H2O2) and strong acid, adjusting the pH value of the mixed solution to 1-1.6 and stirring evenly to obtain an electrochemical Deposition solution; place the transparent conductive substrate as the working electrode in the obtained electrochemical deposition solution and apply a negative potential, adopt a three-electrode electrodeposition system, and deposit vanadium-doped crystalline tungsten trioxide electrochromic film by pulse electrodeposition method .

[0030] In the embodiment of the present invention, after dissolving the tungsten source and the vanadium source in deionized water, a mixed solution is obtained. Then add strong acid and hydrogen peroxide to the mixed solution to adjust the pH value of the mixed solution to between 1 and 1.6 and stir it with a magnetic ...

Embodiment 1

[0033] 1. Clean the conductive glass substrate: Clean the ITO conductive glass substrate with an area of ​​1cm×4cm (square resistance 6-7Ω) with acetone, absolute ethanol, and deionized water for 10 minutes, and then dry it at 60°C. A clean conductive glass substrate is obtained.

[0034] 2. Configure the electrodeposition solution:

[0035] ①Weigh 1.4g of sodium tungstate dihydrate (analytical grade) and 0.01g of sodium metavanadate, and put them into a beaker.

[0036] ② Measure 60ml of deionized water into the beaker and stir with a glass. Measure 0.3ml of hydrogen peroxide solution (30% mass fraction) and add it to the container filled with sodium tungstate dihydrate and sodium metavanadate.

[0037] ③Add a certain amount of 2mol / L sulfuric acid aqueous solution, adjust the mixed solution to ph=1.4, and magnetically stir the mixed solution for 20 minutes at a speed of 1200 rpm to prepare an electrochemical deposition solution.

[0038] 3. Thin film deposited by electroc...

Embodiment 2

[0043] 1. Clean the conductive glass substrate: Clean the ITO conductive glass substrate with an area of ​​1cm×4cm (square resistance 6-7Ω) with acetone, absolute ethanol, and deionized water for 10 minutes, and then dry it at 60°C. A clean conductive glass substrate is obtained.

[0044] 2. Configure the electrodeposition solution:

[0045] ①Weigh 1.4g of sodium tungstate dihydrate (analytical grade) and 0.02g of sodium metavanadate, and put them into a beaker.

[0046] ② Measure 60ml of deionized water into the beaker and stir with a glass. Measure 0.1ml of hydrogen peroxide solution (30% mass fraction) and add it to the container containing sodium tungstate dihydrate and sodium metavanadate.

[0047] ③Add a certain amount of 2mol / L sulfuric acid aqueous solution to adjust the mixed solution to ph=1.4, and magnetically stir the mixed solution for 20 minutes at a speed of 1200 rpm to prepare an electrochemical deposition solution.

[0048] 3. Electrochemical deposition of ...

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Abstract

The invention provides a vanadium-doped crystalline tungsten trioxide electrochromic film and a preparation method thereof.The molar ratio of vanadium atoms to tungsten atoms in the vanadium-doped crystalline tungsten trioxide electrochromic film is (0.01-0.1), and the preparation process comprises the steps that 1 cm * 4 cm ITO glass is subjected to ultrasonic cleaning through acetone, ethyl alcohol and deionized water respectively, and the ITO glass is put into a drying oven to be dried; the preparation method comprises the following steps: respectively weighing sodium metavanadate and sodium tungstate, dissolving the sodium metavanadate and the sodium tungstate in deionized water, adding a 30% hydrogen peroxide solution, adding a proper amount of a sulfuric acid solution, and adjusting the pH value; depositing by adopting a three-electrode system to obtain a tungsten oxide film; and roasting in a muffle furnace to obtain the crystalline tungsten oxide film. The method adopted by the invention is simple to operate and low in cost, a template agent does not need to be added, and the prepared film is uniform in pore structure, excellent in electrochromic performance and good in cycling stability.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a vanadium-doped crystalline tungsten trioxide electrochromic film and a preparation method thereof. Background technique [0002] Electrochromic technology provides a new solution for the energy saving of modern buildings. Electrochromic devices produce reversible optical changes in a wide range of electromagnetic spectrum from visible light to infrared light and microwaves, and can adjust the temperature of glass according to human will. Visible light transmittance and sunlight radiation have broad application prospects in energy-saving buildings, automobile industry, displays, military camouflage, satellite thermal control and other fields. Vanadium-containing tungsten oxide films have better neutral color than pure tungsten oxide films, and are more suitable for electrochromic windows. However, the existing methods for preparing vanadium-doped tungsten trioxide films mainl...

Claims

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Application Information

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IPC IPC(8): C03C17/22C03C17/23
CPCC03C17/22C03C17/23C03C2218/11
Inventor 袁家虎崔月华杨锋
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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