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Method for preparing silver nanowire-graphene composite aerogel

A graphene composite, silver nanowire technology, applied in the field of catalyst preparation, can solve problems such as unsatisfactory catalytic results, and achieve the effects of adjustable shape, super large porosity and low density

Active Publication Date: 2016-04-20
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of catalyst, and it is the catalyst of graphene and silver nanowire composite, is used for overcoming the catalytic efficiency problem of catalyst in optical, electrical catalysis in the prior art. , the defect of unsatisfactory catalytic results

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  • Method for preparing silver nanowire-graphene composite aerogel
  • Method for preparing silver nanowire-graphene composite aerogel
  • Method for preparing silver nanowire-graphene composite aerogel

Examples

Experimental program
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Embodiment 1

[0039] 200 mg of graphene oxide was dissolved in 100 mL of deionized water, and ultrasonically oscillated for 2 hours to prepare a graphene oxide aqueous solution with a mass concentration of 2 mg / ml. Take 15ml of graphene oxide aqueous solution and put it into a beaker, then add 90mg of reducing agent, mix evenly, transfer the mixed solution into a closed container, and keep it warm at 90°C for 20h to prepare graphene hydrogel. After the reaction, rinse the graphene hydrogel with deionized water, adjust the pH to 6.5, freeze the above product in a refrigerator at -75°C for 4 hours, and then dry the product in a freeze dryer for 12 hours to prepare the sample graphene Airgel A. The reducing agent is sodium sulfite.

Embodiment 2

[0041] 200 mg of graphene oxide was dissolved in 100 mL of deionized water, and ultrasonically oscillated for 2 hours to prepare a graphene oxide aqueous solution with a mass concentration of 2 mg / ml. Take 15ml of graphene oxide aqueous solution and add it to a beaker, then add 1.5ml of Ag nanowire aqueous solution (mass concentration is 10mg / ml), then add 90mg of reducing agent, after mixing evenly, transfer the mixed solution into a closed container, and keep it warm at 90°C 20h, the silver nanowire / graphene hydrogel was prepared. After the reaction, rinse the silver nanowire / graphene hydrogel with deionized water, adjust the pH to 6.5, freeze the above product in a -75°C refrigerator for 4 hours, and then dry the product in a freeze dryer for 12 hours to prepare Obtain sample silver nanowire / graphene airgel B.

[0042] In this embodiment, the width of the silver nanowires is 20-80 nm. The reducing agent is sodium sulfite.

Embodiment 3

[0044]200 mg of graphene oxide was dissolved in 100 mL of deionized water, and ultrasonically oscillated for 2 hours to prepare a graphene oxide aqueous solution with a mass concentration of 2 mg / ml. Take 15ml of graphene oxide aqueous solution and add it to a beaker, then add 3ml of Ag nanowire aqueous solution (mass concentration is 10mg / ml), then add 90mg of reducing agent, after mixing evenly, transfer the mixed solution into a closed container, and keep it warm at 90°C for 20h , to prepare silver nanowire / graphene hydrogels. After the reaction, rinse the silver nanowire / graphene hydrogel with deionized water, adjust the pH to 6.5, freeze the above product in a -75°C refrigerator for 4 hours, and then dry the product in a freeze dryer for 12 hours to prepare Obtain sample silver nanowire / graphene airgel C.

[0045] In this embodiment, the width of the silver nanowires is 20-80 nm. The reducing agent is sodium sulfide.

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Abstract

The invention discloses a method for preparing silver nanowire-graphene composite aerogel. The method comprises steps as follows: 1) preparation of a graphene oxide aqueous solution: graphene oxide sheets are added to water for mixing, and the graphene oxide aqueous solution with the mass concentration being 0.5-10 mg / mL is prepared; 2) a silver nanowire solution with the mass concentration being 1-20 mg / mL is added to the graphene oxide aqueous solution prepared in the step 1) for mixing, and a mixed solution is prepared; 3) a reducing agent is added to the mixed solution, the reducing agent and the mixed solution react in a closed container, and hydrogel is prepared; 4) the hydrogel is cleaned and dried, and the aerogel is prepared. The particle size of a silver nanowire-graphene composite aerogel material can obviously reduce volume shrinkage of the hydrogel, a large quantity of high-activity silver nanoparticles are loaded in graphene, and the material has the advantages of ultra-large porosity, low density, large specific surface area, adjustable shape, simple preparation process and the like.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a method for preparing silver nanowire-graphene composite airgel. Background technique [0002] Graphene is a two-dimensional crystal with sp2 hybridized atomic layers. It has unique electrical, mechanical, thermal, large specific surface area, and low manufacturing costs. It has attracted widespread attention from scientific researchers in recent years. Graphene airgel is a three-dimensional porous structure material formed by overlapping graphene. In addition to a series of excellent properties of traditional carbon material aerogels, its developed voids, ultra-low density and excellent electrical conductivity It endows graphene airgel with broad application prospects in the fields of energy, environmental protection and catalysis. In the structure of graphene airgel, the coiled stacking of graphene nanosheets creates the voids of the airgel, which keeps a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 韩婷李小鹏孙予罕肖亚宁刘斌孙志强
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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