Method for synthesizing tungsten trioxide electrochromic material by one step with assistance of citric acid

A technology of tungsten trioxide and electrochromism, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, tungsten oxide/tungsten hydroxide, etc., can solve the problems of reducing electrochromic performance, increasing preparation cost and complexity, and achieving Excellent electrochromic performance, low cost, and controllable preparation effect

Inactive Publication Date: 2018-03-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional hydrothermal technology requires high temperature (120-200°C), high pressure, and the assistance of a seed layer to realize the synthesis of tungsten trioxide nanomaterials.
This not only increases the fabrication cost and complexity, but also reduces its electrochromic performance

Method used

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  • Method for synthesizing tungsten trioxide electrochromic material by one step with assistance of citric acid
  • Method for synthesizing tungsten trioxide electrochromic material by one step with assistance of citric acid
  • Method for synthesizing tungsten trioxide electrochromic material by one step with assistance of citric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 0.8246g sodium tungstate dihydrate (Na 2 WO 4 2H 2 O) and 1.0507g citric acid monohydrate (C 6 h 8 o 7 ·H 2 O) Dissolve in 100mL deionized water, stir magnetically at room temperature until completely dissolved, and form Na 2 WO 4 2H 2 O and C 6 h 8 o 7 ·H 2 O molar ratio is the solution of 1:2; Then the hydrochloric acid of 5mol / L is dripped in the above-mentioned solution dropwise, adjusts the solution pH value to 0.5, after stirring at room temperature, obtains the tungsten trioxide precursor solution;

[0042] Fluorine-doped tin oxide (FTO) transparent conductive glass substrates were ultrasonically cleaned in acetone, ethanol, and deionized water for 15 minutes and dried, and placed obliquely in the lining of a hydrothermal kettle with the transparent conductive layer facing down. Transfer the tungsten trioxide precursor solution to the lining of the hydrothermal kettle, and then tighten the hydrothermal kettle; place the hydrothermal kettle in an oven,...

Embodiment 2

[0045] 1.3194g sodium tungstate dihydrate (Na 2 WO 4 2H 2 O) and 1.0507g citric acid monohydrate (C 6 h 8 o 7 ·H 2 O) Dissolve in 100mL deionized water, stir magnetically at room temperature until completely dissolved, and form Na 2 WO 4 2H 2 O and C 6 h 8 o 7 ·H 2 O molar ratio is the solution of 1:1.25; Then the hydrochloric acid of 5mol / L is dripped in the above-mentioned solution dropwise, adjusts the solution pH value to 1, after stirring at room temperature, obtains the tungsten trioxide precursor solution;

[0046] Fluorine-doped tin oxide (FTO) transparent conductive glass substrates were ultrasonically cleaned in acetone, ethanol, and deionized water for 15 minutes and dried, and placed obliquely in the lining of a hydrothermal kettle with the transparent conductive layer facing down. Transfer the tungsten trioxide precursor solution to the inner lining of the hydrothermal kettle, and then tighten the hydrothermal kettle; place the hydrothermal kettle in a...

Embodiment 3

[0049] 2.0616g sodium tungstate dihydrate (Na 2 WO 4 2H 2 O) and 1.3134g citric acid monohydrate (C 6 h 8 o 7 ·H 2 O) Dissolve in 100mL deionized water, stir magnetically at room temperature until completely dissolved, and form Na 2 WO 4 2H 2 O and C 6 h 8 o 7 ·H 2 O molar ratio is the solution of 1:1; Then the hydrochloric acid of 5mol / L is dripped in the above-mentioned solution dropwise, adjusts the solution pH value to 0.5, after stirring at room temperature, obtains the tungsten trioxide precursor solution;

[0050] Fluorine-doped tin oxide (FTO) transparent conductive glass substrates were ultrasonically cleaned in acetone, ethanol, and deionized water for 15 minutes and dried, and placed obliquely in the lining of a hydrothermal kettle with the transparent conductive layer facing down. Transfer the tungsten trioxide precursor solution to the inner lining of the hydrothermal kettle, and then tighten the hydrothermal kettle; place the hydrothermal kettle in an...

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Abstract

The invention relates to a method for synthesizing a tungsten trioxide electrochromic material by one step with assistance of citric acid. The method comprises the following steps: dissolving a tungsten source and a chelating agent in a molar ratio of (0.4-1.2):1 in water, stirring the mixture uniformly, and adding a morphology control agent to obtain a mixed solution, wherein the molar ratio of the morphology control agent to the tungsten source is (0-0.1):1; adjusting the pH value of the mixed solution to be 0.5-2 by acid to obtain a tungsten trioxide precursor solution; placing a conductiveglass substrate in the tungsten trioxide precursor solution, and growing a tungsten trioxide electrochromic nano-material on the surface of the conductive glass substrate at 85-95 DEG C. The method is easy to operate, and has the characteristics of low cost, low temperature requirement and the like.

Description

technical field [0001] The invention belongs to the technical field of functional materials and devices, and in particular relates to a method for synthesizing tungsten trioxide electrochromic materials by one-step method assisted by citric acid. Background technique [0002] The phenomenon of electrochromic (Electrochromic) refers to the reversible change of the material between the coloring and fading states through the injection and extraction of ions or electrons under the action of alternating voltage, which is manifested in the appearance of the material color and transparency. reversible change. Electrochromic materials have broad application prospects in smart windows, automotive anti-glare rearview mirrors, goggles, displays and other fields. Compared with liquid crystal and suspended particle dimming, electrochromic has the advantages of adjustable color, low energy consumption, and memory effect. [0003] Tungsten trioxide (WO 3 ) as a traditional cathodic elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02C09K9/00B82Y40/00
CPCB82Y40/00C01G41/02C01P2002/72C01P2004/03C01P2004/64C09K9/00
Inventor 李效民毕志杰陈永博何晓利高相东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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