Method for preparing vanadium pentoxide/graphene composite aerogel material

A vanadium pentoxide sol and vanadium pentoxide technology, applied in the field of electrochemistry, can solve problems affecting the overall performance of capacitors, poor aerogel conductivity, and large internal resistance of capacitors, and achieve light weight, low cost, and high power density. high effect

Active Publication Date: 2015-03-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As disclosed in the above patent, the current V 2 o 5 The vast majority of aerogels are prepared by using organic vanadium salts or vanadium alkoxides as precursors. The raw materials must be imported, and the cost is very high, and V cannot be fully utilized. 2 o 5 Due to the advantage of low price, the preparation of vanadium oxide airgel with inorganic vanadium source as precursor has important application value
[0006] However a single V 2 o 5 The cond...

Method used

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  • Method for preparing vanadium pentoxide/graphene composite aerogel material
  • Method for preparing vanadium pentoxide/graphene composite aerogel material
  • Method for preparing vanadium pentoxide/graphene composite aerogel material

Examples

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Effect test

Embodiment 1

[0033] Stir and mix 30g of vanadium pentoxide powder, 17.5ml of benzyl alcohol and 500ml of isopropanol (molar ratio 1:1:40), reflux and condense at 90°C for 4 hours, filter and recover unreacted vanadium pentoxide powder to obtain Vanadium pentoxide sol. The obtained vanadium pentoxide sol was concentrated by distillation at 100°C to 1 / 2 of the original volume to obtain concentrated vanadium pentoxide sol. 15ml of graphene oxide aqueous dispersion with a concentration of 2mg / ml and 1ml of formic acid were added to the concentrated vanadium pentoxide sol, stirred for 1 minute and aged at 50°C for 2 days to obtain a vanadium pentoxide / graphene oxide wet gel. The vanadium pentoxide / graphene oxide wet gel was soaked in acetone, the solvent was replaced for 2 days, and the vanadium pentoxide / graphene oxide composite airgel was obtained after supercritical drying with carbon dioxide. The vanadium pentoxide / graphene oxide composite airgel was heat-treated in air at 300° C. for 3 ho...

Embodiment 2

[0036]30g of vanadium pentoxide powder, 35ml of benzyl alcohol and 750ml of isopropanol (molar ratio 1:2:60) were stirred and mixed, refluxed and condensed at 95°C for 4 hours, filtered and unreacted vanadium pentoxide powder was recovered to obtain five Vanadium oxide sol. The obtained vanadium pentoxide sol was concentrated by distillation at 100°C to 1 / 3 of the original volume to obtain concentrated vanadium pentoxide sol. 15ml of graphene oxide aqueous dispersion with a concentration of 4mg / ml and 1ml of acetic acid were added to the concentrated vanadium pentoxide sol, stirred for 1 minute and aged at 50°C for 3 days to obtain a vanadium pentoxide / graphene oxide wet gel. The vanadium pentoxide / graphene oxide wet gel was soaked in methanol, the solvent was replaced for 2 days, and the vanadium pentoxide / graphene oxide composite airgel was obtained after freeze-drying. The vanadium pentoxide / graphene oxide composite airgel was heat-treated in air at 350° C. for 3 hours to ...

Embodiment 3

[0039] 30g of vanadium pentoxide powder, 70ml of benzyl alcohol and 500ml of isopropanol (molar ratio 1:4:40) were stirred and mixed, refluxed and condensed at 100°C for 4 hours, filtered and unreacted vanadium pentoxide powder was recovered to obtain five Vanadium oxide sol. The obtained vanadium pentoxide sol was concentrated by distillation at 100°C to 2 / 5 of the original volume to obtain concentrated vanadium pentoxide sol. 15ml of graphene oxide aqueous dispersion with a concentration of 6mg / ml and 2ml of acetic acid were added to the concentrated vanadium pentoxide sol, stirred for 2 minutes and aged at 50°C for 3 days to obtain a vanadium pentoxide / graphene oxide wet gel. The vanadium pentoxide / graphene oxide wet gel was soaked in ethanol, the solvent was replaced for 2 days, and the vanadium pentoxide / graphene oxide composite airgel was obtained after freeze-drying. The vanadium pentoxide / graphene oxide composite airgel was heat-treated at 400° C. in the air for 3 hou...

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Abstract

The invention relates to a method for preparing a vanadium pentoxide/graphene composite aerogel material. The method comprises the following steps: firstly, evenly mixing vanadium pentoxide powder, benzyl alcohol and isopropyl alcohol, refluxing, condensing, and filtering to obtain vanadium pentoxide sol; evaporating and concentrating to obtain concentrated vanadium pentoxide sol; adding an aqueous dispersion of graphene oxide and a catalyst to the concentrated vanadium pentoxide gel; stirring and ageing, so as to obtain vanadium pentoxide/graphene composite wet gel; carrying out solvent replacement in replaced solvent; drying to obtain vanadium pentoxide/graphene composite aerogel; and carrying out thermal treatment, so as to obtain the vanadium pentoxide/graphene composite aerogel. Compared with the prior art, the method disclosed by the invention is simple and easy to achieve; and meanwhile, inorganic vanadium pentoxide powder is adopted as the raw material, so that the cost is relatively low; and popularization and application are facilitated; meanwhile, a metallic oxide is evenly compounded with graphene through in-situ growth; and a new way is provided for the preparation of metallic oxide/graphene composite aerogel.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a vanadium pentoxide / graphene composite airgel material. Background technique [0002] With the rapid development of economy and society and the continuous improvement of people's living standards, environmental pollution, climate change and energy crisis have become important issues in China and the world today. In order to reduce the use of fossil energy, countries around the world are actively developing clean, sustainable and renewable energy such as solar energy, wind energy and tidal energy. New energy is usually converted into electrical energy for storage and transportation, and batteries and electrochemical capacitors have become the focus of attention as the most important electrical energy storage devices. [0003] As a traditional energy storage device, batteries have been widely developed and applied, and play an importan...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 高国华武英杰吴广明沈军周斌
Owner TONGJI UNIV
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