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ZIF-8/graphene composite aerogel as well as preparation method and application thereof

A graphene composite, ZIF-8 technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve problems such as agglomeration and difficulty in control, and achieve the effect of improving efficiency, stable structure, and simple raw materials

Pending Publication Date: 2021-12-10
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ZIF-8 is prone to agglomeration during the preparation process, which is difficult to control

Method used

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  • ZIF-8/graphene composite aerogel as well as preparation method and application thereof
  • ZIF-8/graphene composite aerogel as well as preparation method and application thereof
  • ZIF-8/graphene composite aerogel as well as preparation method and application thereof

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preparation example Construction

[0035] The embodiment of the present invention provides a kind of preparation method of ZIF-8 / graphene composite airgel, comprises the following steps:

[0036] S1, graphite powder and sodium nitrate NaNO 3 Mix, slowly drop into the acid solution, then add the manganese source, stir the reaction, wash and centrifuge to obtain the graphene oxide solution;

[0037] S2. Add a zinc source and an aqueous solution of dimethylimidazole to the graphene oxide solution, stir evenly with ultrasonic waves, place in a high-pressure reactor for hydrothermal reaction, and freeze-dry the product after the reaction to obtain an airgel;

[0038] S3. Calcining the airgel in a muffle furnace to obtain a ZIF-8 / graphene composite airgel.

[0039] In the present invention, the metal-organic framework structure grown on the surface of graphene in directional in-situ is used as a precursor, and the carbon-wrapped metal nano-compounds are obtained after calcining and reducing, and the metal nano-compo...

Embodiment 1

[0054] The present embodiment provides a kind of preparation method of ZIF-8 / graphene composite airgel, comprises the steps:

[0055] 1) Mix 0.5g graphite powder with 0.3g NaNO 3 Put it into a 50mL three-necked flask, ice bath, and stir mechanically. During the stirring process, 25mL H 2 SO 4 (98%) was slowly added dropwise, then 2g KMnO 4 Add slowly in 5 times, remove the ice bath after 50 minutes of reaction, and stir mechanically at 15°C for 24 hours. Then add 25mL of water and continue to stir for 30min; then add 30% H 2 o 2 Slowly add to the reaction until no bubbles are produced; after the reaction is over, take out the mixture, wash 3 times with 10wt% HCI aqueous solution, centrifuge, wash the precipitate with water several times until neutral, centrifuge, take a certain amount of precipitate and redisperse in In deionized water, sonicate for 30 minutes to obtain a brown graphene oxide solution.

[0056] 2) The configuration concentration is 40mg·L -1 80mL of zin...

Embodiment 2

[0066] The present embodiment provides a kind of preparation method of ZIF-8 / graphene composite airgel, comprises the steps:

[0067] 1) Mix 0.5g graphite powder with 0.45g NaNO 3 Put it into a 50mL three-necked flask, ice bath, and stir mechanically. During the stirring process, 15mLH 2 SO 4 (98%) was slowly added dropwise, then 3g KMnO 4 Add slowly in 5 times, remove the ice bath after 45 minutes of reaction, and stir mechanically at 15°C for 48 hours. Then add 50mL of water and continue to stir for 30min; then add 30% H 2 o 2 Slowly add to the reaction until no bubbles are produced; after the reaction is over, take out the mixture, wash 3 times with 15wt% HCI aqueous solution, centrifuge, and repeatedly wash the precipitate with water several times until neutral, centrifuge, take a certain amount of precipitate and redisperse In deionized water, sonicate for 30 minutes to obtain a brown graphene oxide solution.

[0068] 2) The configuration concentration is 40mg·L -1...

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Abstract

The invention provides ZIF-8 / graphene composite aerogel as well as a preparation method and application thereof. The preparation method comprises the following steps of: mixing graphite powder with sodium nitrate, slowly dropwise adding an acid solution, then adding a manganese source, stirring for reaction, performing washing and centrifuging to obtain a graphene oxide solution; adding a zinc source and a dimethylimidazole aqueous solution into the graphene oxide solution, ultrasonically stirring a mixed solution uniformly, putting the solution into a high-pressure reaction kettle, carrying out hydrothermal reaction, and freeze-drying a product after the reaction is finished, so as to obtain aerogel; placing the aerogel in a muffle furnace to calcine the aerogel so as to obtain the ZIF-8 / graphene composite aerogel. The preparation method is simple and mild in reaction condition; the prepared ZIF-8 / graphene composite aerogel is stable in structure and large in number of active sites, and is beneficial to improving the efficiency of electro-catalytic hydrogen evolution.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a ZIF-8 / graphene composite airgel and its preparation method and application. Background technique [0002] Among many new energy sources, hydrogen energy has high combustion calorific value and non-polluting products, which is a very popular clean energy in recent years. Hydrogen production by electrolysis of water is the most mature hydrogen production process at present. Water is used as a raw material, and protons are reduced to hydrogen gas, that is, the reduction half-reaction of water decomposition. However, this reaction needs to be carried out under the action of some catalysts. An efficient catalyst can reduce the overpotential of hydrogen evolution, or increase its current density in the process of hydrogen evolution. The application research of transition metal compounds in hydrogen evolution reaction has attracted much attention. [0003] Metal-organic framewo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/095C25B1/04
CPCC25B11/095C25B1/04Y02E60/36
Inventor 王建芝左训行郭自依
Owner WUHAN INSTITUTE OF TECHNOLOGY
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