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An electrochemical method for preparing tungsten trioxide nanosheets

A tungsten trioxide, electrochemical technology, applied in the direction of nanotechnology, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of low utilization rate of metal anode, single structure, no economic benefits, etc., and achieve low requirements for reaction equipment , cost-effective, and structured

Active Publication Date: 2019-04-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the usually formed film is thin and has a single structure, and the utilization rate of the metal anode is very low, so it does not have high economic benefits in industrial production and application.
At present, domestic and foreign reports on the use of metal tungsten electrooxidation to prepare nanomaterials mainly focus on the formation of porous film layers on the surface of tungsten metal. to report

Method used

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  • An electrochemical method for preparing tungsten trioxide nanosheets
  • An electrochemical method for preparing tungsten trioxide nanosheets
  • An electrochemical method for preparing tungsten trioxide nanosheets

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Cut the tungsten sheet with a thickness of 0.085mm into 1×1cm 2 The specifications were ultrasonically cleaned in acetone, ethanol and deionized water for 15 minutes, rinsed with deionized water and dried to obtain a metal tungsten electrode after degreasing; the ionic liquid 1-ethyl-3 methylimidazolium tetrafluoroboron Salt ([EMim]BF 4 ) 0.6mL and 12mL of deionized water were added in 47.4mL of ethylene glycol to obtain an electrolyte solution (wherein the volume fraction of ionic liquid was 1%, and the volume fraction of deionized water was 20%). Use tungsten sheet as anode, titanium sheet (thickness 0.2mm, specification 2×2cm 2 ) as the cathode, put it into the electrolyte, keep the electrode distance at 1.5cm, control the temperature of the electrolyte at 25°C, and oxidize it at 20V until the tungsten is completely dissolved and oxidized into powder (8h); collect the solid powder, deionize Washing with water, filtering, and drying to obtain the product tungsten tr...

Embodiment 2

[0027] Cut the tungsten sheet with a thickness of 0.085mm into 1×1cm 2 The specifications were ultrasonically cleaned in acetone, ethanol and deionized water for 15 minutes, rinsed with deionized water and dried to obtain a metal tungsten electrode after degreasing; the ionic liquid 1-ethyl-3 methylimidazolium tetrafluoroboron Salt ([EMim]BF 4 ) 0.6mL and 12mL of deionized water were added in 47.4mL of ethylene glycol to obtain an electrolyte solution (wherein the volume fraction of ionic liquid was 1%, and the volume fraction of deionized water was 20%). Use tungsten sheet as anode, titanium sheet (thickness 0.2mm, specification 2×2cm 2 ) as the cathode, put it into the electrolyte, keep the distance between the electrodes at 1.5cm, control the temperature of the electrolyte at 100°C, oxidize at 20V until the tungsten is completely dissolved, and oxidize into powder (2h); collect the solid powder, deionize Washing with water, filtering, and drying to obtain tungsten trioxid...

Embodiment 3

[0029] Cut the tungsten sheet with a thickness of 0.085mm into 1×1cm 2 The specifications were ultrasonically cleaned in acetone, ethanol and deionized water for 15 minutes, rinsed with deionized water and dried to obtain a metal tungsten electrode after degreasing; the ionic liquid 1-ethyl-3 methylimidazolium tetrafluoroboron Salt ([EMim]BF 4 ) 0.6mL and 12mL of deionized water were added in 47.4mL of ethylene glycol to obtain an electrolyte solution (wherein the volume fraction of ionic liquid was 1%, and the volume fraction of deionized water was 20%). Use tungsten sheet as anode, titanium sheet (thickness 0.2mm, specification 2×2cm 2 ) as the cathode, put it into the electrolyte, keep the electrode distance at 1.5cm, control the temperature of the electrolyte at 0°C, and oxidize it at 20V until the tungsten is completely dissolved and oxidized into powder (24h); collect the solid powder, deionize Washing with water, filtering, and drying to obtain tungsten trioxide nanos...

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Abstract

The invention provides an electrochemical method for preparing tungsten trioxide nanosheets. The method is characterized in that metal tungsten serves as a substrate, in the organic solvent electrolyte containing ionic liquid, and an electrochemical anodic oxidation method is adopted to prepare nano-scale flaky-structure tungsten trioxide powder material; the tungsten oxide nanosheets of differentsize structures are obtained by controlling electrolyte components, the reaction temperature, the oxidation voltage and the oxidation time; and the prepared tungsten trioxide nanosheets are regular in structure and uniform in size, and have relatively large specific surface area. According to the electrochemical method for preparing the tungsten trioxide nanosheets, the preparation process is simple, operation is simple and convenient, the requirement for reaction equipment is low, and being economical and efficient is achieved; and the prepared tungsten trioxide nanosheet powder is high in yield and stable in property, the utilization rate of the powder to the metal tungsten substrate is high, the economic benefit is high, and a wide application prospect in the aspect of industrial application is achieved.

Description

(1) Technical field [0001] The invention relates to an electrochemical method for preparing tungsten trioxide nanosheets, in particular to a method for preparing tungsten trioxide nanosheets through electrochemical anodic oxidation in an organic solvent electrolyte containing ionic liquid. (2) Background technology [0002] Tungsten trioxide and its hydrated oxides are very important n-type semiconductor materials with a bandgap between 2.4-2.8eV. They have excellent physical and chemical properties and unique electrocatalytic activity. They are used in electrochromic, gas sensitive It has very important applications in the fields of electrocatalysis, photocatalysis and so on. Tungsten trioxide nanomaterials with sheet-like structure can effectively expose more catalytic active sites and reduce photogenerated holes- The recombination of electrons prolongs the lifetime of photogenerated carriers and improves the catalytic activity. In recent years, the preparation of tungst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26B82Y40/00
CPCB82Y40/00C25D11/26
Inventor 李国华吴世照周浩
Owner ZHEJIANG UNIV OF TECH
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