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High-loading-capacity loaded metal single-atom graphene material and preparation method thereof

A technology for supporting metals and graphene, which is applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve the problems of restricting the application of fuel cells, the thickness of the catalytic layer is large, and affects mass transfer, etc., to achieve Improved utilization rate, large specific surface area, and simple operation

Active Publication Date: 2019-05-10
北京海得利兹新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the thickness of the catalytic layer is too large, which seriously affects the mass transfer and restricts its application in fuel cells.

Method used

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  • High-loading-capacity loaded metal single-atom graphene material and preparation method thereof
  • High-loading-capacity loaded metal single-atom graphene material and preparation method thereof
  • High-loading-capacity loaded metal single-atom graphene material and preparation method thereof

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Embodiment 1

[0030] Take 100 mg of heme and add it into 50 mL of ethanol solution, stir and disperse evenly, then mix with 15 g of dicyandiamide and grind into a uniform powder. The powder is placed in a tube furnace with argon as the protective gas (flow rate of 80 sccm), and the temperature rises to 350°C at a rate of 5°C / min. The heat treatment time is 3 hours under argon, and the temperature continues to rise to 650°C. After 3 hours of low temperature treatment, continue to heat up to 900° C., treat for 1 hour, and cool down to room temperature. Take out the black sample. Call it Sample 1.

Embodiment 2

[0032] Add 50mg heme and 50mg cobalt nitrate into 50mL ethanol solution, stir and disperse evenly, mix with 15g melamine and grind into uniform powder. The powder is placed in a tube furnace with argon as the protective gas (flow rate of 80 sccm), and the temperature rises to 350°C at a rate of 5°C / min. The heat treatment time is 3 hours under argon, and the temperature continues to rise to 650°C. After 3 hours of low temperature treatment, the temperature was further raised to 900° C., treated for 1 hour, and then cooled to room temperature to obtain a black single-atom catalyst sample. Iron and cobalt single atoms in the sample are uniformly dispersed without particles, and the carbon material is a layered graphene structure. Energy spectrum analysis shows that Fe and Co are exposed on the surface of graphene with high density and uniformity, and the iron single atom loading is about 8.8wt%. .

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Abstract

The invention discloses a high-loading-capacity loaded metal single-atom graphene material and a preparation method thereof. Heme and a nitrogen-rich material are uniformly mixed, a solvent is added and ground to obtain uniform powder; and segmented heat treatment is carried out on the obtained uniform powder, so that a black product is obtained, namely a high-loading-capacity loaded metal single-atom graphene material is obtained. According to the method, a graphene material loaded with metal single atoms is generated by adopting an in-situ growth method, thereby effectively preventing wrapping of carbon loaded with the single atoms, improving the utilization rate of the single atom participating in a functional reaction, effectively solving the difficulty that a large number of single atoms are wrapped due to the fact that conventional salt is mixed with a carbon source and a nitrogen source as well as effectively maintaining the integrity of the carbon carrier material, and avoidingthe carrier material from introducing excessive single atomic defects to influence electron conduction.

Description

technical field [0001] The invention relates to a high-capacity metal single-atom graphene material and a preparation method thereof, belonging to the technical field of fuel cells. Background technique [0002] Proton exchange membrane fuel cells are a clean, efficient mobile power source widely considered to replace car engines. After a lot of research in the past two decades, proton exchange membrane fuel cells have entered the eve of industrialization. However, despite the good potential of proton exchange membrane fuel cells, their widespread application still faces challenges. One of them is that the electrodes of proton exchange membrane fuel cells rely on Pt-based catalysts to realize H 2 and O 2 Efficient catalysis. The abundance of Pt in the earth's crust is very low, and its high price restricts the application of proton exchange membrane fuel cells. Therefore, finding non-noble metal catalytic materials that can replace Pt-based catalysts is of great signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCY02E60/50
Inventor 蒋三平程义郭志斌张艳
Owner 北京海得利兹新技术有限公司