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A tungsten trioxide/vanadium pentoxide core-shell nanowire array electrochromic material and its preparation method

A technology of vanadium pentoxide core-shell nanometer and electrochromic materials, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, nanotechnology, etc., and can solve the problems of small conductivity, lithium ion diffusion coefficient, poor cycle stability, and low coloring efficiency and other problems, to achieve the effect of speeding up the reaction kinetics process, improving the contrast, and controlling the film thickness

Active Publication Date: 2019-06-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, vanadium pentoxide thin films also have some disadvantages in electrochromic devices, such as poor cycle stability, low conductivity and lithium ion diffusion coefficient, poor contrast and low coloring efficiency, etc.

Method used

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  • A tungsten trioxide/vanadium pentoxide core-shell nanowire array electrochromic material and its preparation method
  • A tungsten trioxide/vanadium pentoxide core-shell nanowire array electrochromic material and its preparation method
  • A tungsten trioxide/vanadium pentoxide core-shell nanowire array electrochromic material and its preparation method

Examples

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Embodiment 1

[0034] A preparation method of a tungsten trioxide / vanadium pentoxide core-shell nanowire array electrochromic material, the specific steps are as follows:

[0035] (1) Place the FTO conductive glass in a beaker filled with acetone, ethanol, and deionized water in turn, and ultrasonicate for 30 minutes respectively, and then put it on filter paper and dry it with an infrared lamp;

[0036] (2) Preparation of peroxytungstic acid solution: Dissolve 2.5g of tungstic acid in 60mL of deionized water by heating and stirring, then add 20mL of hydrogen peroxide with a mass fraction of 30% to it, stir until the solution is clear, and then dissolve it with deionized water Dilute the solution to a tungsten concentration of 0.05mol / L, and the diluted solution is peroxytungstic acid solution;

[0037] (3) Preparation of precursor solution: 10mL of peroxytungstic acid prepared in step (2), 10mL of deionized water and 40mL of acetonitrile were made into a mixed solution, and then the pH of t...

Embodiment 2

[0043] A preparation method of a tungsten trioxide / vanadium pentoxide core-shell nanowire array electrochromic material, the specific steps are as follows:

[0044] (1) Place the FTO conductive glass in a beaker filled with acetone, ethanol, and deionized water in turn, and ultrasonicate for 20 minutes respectively, and then put it on filter paper and dry it with an infrared lamp;

[0045] (2) Preparation of peroxytungstic acid solution: Dissolve 2.5g of tungstic acid in 60mL of deionized water by heating and stirring, then add 20mL of hydrogen peroxide with a mass fraction of 30% to it, stir until the solution is clear, and then dissolve it with deionized water Dilute the solution to a tungsten concentration of 0.05mol / L, and the diluted solution is peroxytungstic acid solution;

[0046] (3) Preparation of precursor solution: 10mL of peroxytungstic acid prepared in step (2), 40mL of acetonitrile, and 10mL of deionized water were made into a mixed solution, and then the pH of ...

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Abstract

The invention discloses preparation and electrochromic characteristics of a tungsten trioxide / vanadium pentoxide core-shell-structured nanowire array. According to the invention, tungsten trioxide is used as a core and vanadium pentoxide is used as a shell; the lengths of tungsten trioxide nanowires are in a range of 400 to 1000 nm, and the diameters of the tungsten trioxide nanowires gradually decrease from 80 nm to 30 nm; and vanadium pentoxide is of an amorphous porous structure and uniformly coats the nanowires, and after compounding, the diameters of the nanowires are in a range of 100 to 200 nm. An electrochemical workstation and a three-electrode system are employed for electrochemical deposition of vanadium pentoxide onto the surfaces of the tungsten trioxide nanowires prepared through a solvothermal process so as to prepare a core-shell-structured electrochromic material. The tungsten trioxide nanowires grow along a direction perpendicular to a substrate and are uniformly distributed, and vanadium pentoxide is a porous film and uniformly coats the surfaces of the nanowires to form a novel core-shell structure; and the prepared material has excellent electrochromic performance, can realize rapid and reversible conversion among a blue grey color, a yellow green color and an orange yellow color, shows good stability and is applicable to fields like camouflage materials and intelligent chromotropic film materials.

Description

technical field [0001] The invention belongs to the field of electrochromic thin films, and in particular relates to a tungsten trioxide / vanadium pentoxide core-shell nanowire array electrochromic material and a preparation method thereof. Background technique [0002] Electrochromism refers to the reversible and permanent change of light transmittance and (or) reflectance associated with electrochemical redox reactions after a material is applied with an appropriate voltage. Applications of electrochromic devices mainly include: smart windows for cars and buildings, controllable light reflective or light transmissive display devices (for optical information and storage), controllable aircraft canopies, reusable price tags, spacecraft thermal control and more. Electrochromic devices have attracted more and more attention in recent years due to their low energy consumption, improved living comfort, great application prospects in the fields of stealth materials, intelligent c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00C03C17/34B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C03C17/3411C03C2217/23C03C2217/241C03C2217/70C03C2218/11C03C2218/115C09K9/00
Inventor 张勇汤凯史英迪宋艳斌王岩崔接武舒霞秦永强吴玉程
Owner HEFEI UNIV OF TECH
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