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Composite material based on metal single atoms and graphene as well as preparation method and application of composite material

A composite material and graphene technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of lack of strong interaction, limit practical application, low load capacity, etc., achieve high load capacity, fast heat transfer, catalytic highly active effect

Active Publication Date: 2022-01-11
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of strong interactions between single atoms and supports, the current loading of single atom catalysts is very low, which limits their practical application.

Method used

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  • Composite material based on metal single atoms and graphene as well as preparation method and application of composite material
  • Composite material based on metal single atoms and graphene as well as preparation method and application of composite material
  • Composite material based on metal single atoms and graphene as well as preparation method and application of composite material

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preparation example Construction

[0049] A method for preparing a composite material based on metal single atoms and graphene, comprising the following steps:

[0050] mixing graphene, metal oxide and etchant to prepare a mixture;

[0051] The mixture is subjected to microwave heat treatment to prepare a metal single-atom precursor supported by graphene;

[0052]Carrying out water washing treatment to the metal monatomic precursor supported by graphene;

[0053] The etchant is water or potassium hydroxide.

[0054] (1) Using water as an etchant, the method for preparing a composite material based on metal single atoms and graphene provided by the invention comprises the following steps:

[0055] mixing graphene, metal oxide and water to prepare a mixture;

[0056] The mixture is subjected to microwave heat treatment to prepare a metal single-atom precursor supported by graphene;

[0057] The metal single atom precursor supported by graphene is washed with water.

[0058] On the one hand, the high temperat...

Embodiment 1

[0099] This embodiment provides a composite material based on metal single atoms and graphene and a preparation method thereof. details as follows:

[0100] Weigh 1g of graphene and 0.5g of KOH, and disperse them in 500ml and 1L of deionized water respectively to obtain graphene solution and KOH solution; mix the graphene solution and KOH solution, stir and dry at 60°C, and grind to obtain graphite Graphene / KOH powder; Weigh 200mg of MgO, and mix it with graphene / KOH powder by grinding to obtain a graphene / KOH / MgO mixture; put the graphene / KOH / MgO mixture in a quartz tube Then place the quartz reaction vessel in the microwave reaction equipment, start the microwave under vacuum conditions, and carry out the microwave reaction for 30s at 5kW to obtain the graphene-supported Mg metal single-atom catalyst precursor, then wash with deionized water, and finally dry , that is, a graphene-supported Mg metal single-atom catalyst is obtained.

Embodiment 2

[0102] This embodiment provides a composite material based on metal single atoms and graphene and a preparation method thereof. details as follows:

[0103] Weigh 1g of graphene and 0.8g of KOH, and disperse them in 500ml and 1L of deionized water respectively to obtain graphene solution and KOH solution; mix the graphene solution and KOH solution, stir and dry at 60°C, and grind to obtain graphite ene / KOH powder; Weigh 100mg of ZnO, and mix it with graphene / KOH powder by grinding to obtain graphene / KOH / ZnO mixture; put the graphene / KOH / ZnO mixture in a quartz tube Then place the quartz reaction vessel in the microwave reaction equipment, start the microwave under vacuum conditions, and carry out the microwave reaction for 30s under 15kW to obtain the graphene-supported Zn metal single-atom catalyst precursor, then wash with deionized water, and finally dry , that is, a graphene-supported Zn metal single-atom catalyst is obtained.

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Abstract

The invention relates to a composite material based on metal single atoms and graphene as well as a preparation method and application of the composite material. The preparation method of the composite material based on metal single atoms and graphene comprises the steps of mixing graphene, a metal oxide and an etching agent (water or potassium hydroxide) to prepare a mixture; carrying out microwave heat treatment on the mixture to prepare a graphene-loaded metal monatomic precursor; and carrying out water washing treatment on the graphene-loaded metal monatomic precursor. The high temperature generated by microwaves can enable water or potassium hydroxide to etch graphene to form carbon defects and increase the specific surface area of graphene on the one hand, and can enable metal oxide to form steam which is uniformly distributed in graphene and reduced by carbon to be doped into the carbon defects in the form of metal single atoms on the other hand, so that the metal single atoms are doped into the graphene, the metal single atoms are high in loading capacity and not prone to agglomeration, and when the metal single atoms are applied to the electrochemical oxygen reduction reaction, the catalytic activity is high, and the stability is good.

Description

technical field [0001] The invention relates to the technical field of graphene composite materials, in particular to a composite material based on metal single atoms and graphene, its preparation method and application. Background technique [0002] The electrochemical oxygen reduction reaction (ORR) plays a decisive role in the performance of energy storage and conversion systems such as fuel cells and metal-air batteries. ORR is a kinetically slow process, and a suitable catalyst is needed to accelerate the ORR process. Noble metal-based catalysts such as Pt exhibit high catalytic performance for ORR. However, the commercial application of noble metal catalysts is limited due to reasons such as high cost, low reserves, poor stability, and easy poisoning. Therefore, it is necessary to develop low-cost, high-activity, and stable catalysts to replace noble metal catalysts. [0003] Single atom catalyst is a new type of catalyst with greatly reduced cost, high catalytic act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9041H01M4/9083Y02E60/50
Inventor 杜真真王晶王珺于帆李炯利王旭东王刚罗圭纳
Owner 北京石墨烯技术研究院有限公司
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