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Triazinyl covalent network loaded metal single atom composite material, preparation method and application thereof

A composite material, network loading technology, applied in the field of electrocatalysis, can solve problems such as easy agglomeration

Pending Publication Date: 2021-04-09
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high surface energy, mobility, and easy aggregation of isolated metals, the stability of single-atom catalysts during catalytic reactions is a major challenge.

Method used

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  • Triazinyl covalent network loaded metal single atom composite material, preparation method and application thereof
  • Triazinyl covalent network loaded metal single atom composite material, preparation method and application thereof
  • Triazinyl covalent network loaded metal single atom composite material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The invention provides a composite material with a triazine-based covalent network supporting metal single atoms. The composite material comprises a triazine-based covalent network and transition metal single-atom cobalt supported on the triazine-based covalent network. Its preparation method comprises the following steps:

[0060] (1) Mix 2,6-pyridinedicarbonitrile, Ketjen Black EC600JD and zinc chloride, grind and mix them evenly in a glove box, then put them into sealed tubes, and use double-row tubes for argon gas exchange during the tube sealing process After three times, the sealed tube was vacuumed, sintered and sealed, and the sealed tube was placed in a muffle furnace, and the temperature was raised to 400 °C at a rate of 5 °C / min for cyanotrimerization reaction for 21 h; wherein 2,6-pyridinedicarbonitrile and The molar ratio of zinc chloride is 1:5, and the mass ratio of 2,6-pyridinedicarbonitrile to Ketjen Black EC600JD is 1:1;

[0061] (2) The product obtai...

Embodiment 2

[0072] The invention provides a composite material with a triazine-based covalent network supporting metal single atoms. The composite material comprises a triazine-based covalent network and transition metal single-atom cobalt supported on the triazine-based covalent network. Its preparation method comprises the following steps:

[0073] (1) Mix 2,6-pyridinedicarbonitrile, Ketjen Black EC600JD and zinc chloride, grind and mix them evenly in a glove box, then put them into sealed tubes, and use double-row tubes for argon gas exchange during the tube sealing process After three times, the sealed tube was vacuumed, sintered and sealed, and the sealed tube was placed in a muffle furnace, and the temperature was raised to 600 °C at a rate of 10 °C / min for cyanotrimerization reaction for 30 h; wherein 2,6-pyridinedicarbonitrile and The molar ratio of zinc chloride is 1:10, and the mass ratio of 2,6-pyridinedicarbonitrile to Ketjen Black EC600JD is 1:5;

[0074] (2) The product obt...

Embodiment 3

[0079] The invention provides a composite material with a triazine-based covalent network supporting metal single atoms. The composite material comprises a triazine-based covalent network and transition metal single-atom cobalt supported on the triazine-based covalent network. Its preparation method comprises the following steps:

[0080] (1) Mix 2,6-pyridinedicarbonitrile, Ketjen Black EC600JD and zinc chloride, grind and mix them evenly in a glove box, then put them into sealed tubes, and use double-row tubes for argon gas exchange during the tube sealing process After three times, the sealed tube was vacuumed, sintered and sealed, and the sealed tube was placed in a muffle furnace, and the temperature was raised to 700 °C at a rate of 2 °C / min for cyanotrimerization reaction for 20 h; in which 2,6-pyridinedicarbonitrile and The molar ratio of zinc chloride is 1:20, and the mass ratio of 2,6-pyridinedicarbonitrile to Ketjen Black EC600JD is 1:2;

[0081] (2) The product obt...

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Abstract

The invention relates to a triazinyl covalent network loaded metal single atom composite material, a preparation method and application thereof. The composite material comprises a triazinyl covalent network and transition metal single atoms loaded on the triazinyl covalent network, the triazinyl covalent network is composed of a structural unit shown in a formula (I), and the structural unit is formed by crosslinking a pyridine unit and a triazinyl ring. The composite material has a multilayer hierarchical porous structure, endows the material with extremely high specific surface area and rich catalytic active sites, and has excellent catalytic activity, excellent stability and methanol resistance in electrocatalytic oxygen reduction reaction. The method overcomes the defect that in the prior art, a monatomic catalyst is prone to agglomeration and causes unstable catalysis, single atoms can be evenly loaded in a triazinyl covalent network structure, the utilization rate of the single atoms is increased, side reactions in the electrocatalytic reaction are inhibited, and the selectivity of the electrocatalytic reaction is improved.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and specifically relates to a composite material and its preparation method and application, in particular to a composite material with a triazine-based covalent network supporting metal single atoms, its preparation method and application. Background technique [0002] With the continuous consumption of global fossil energy and the aggravation of environmental pollution, electrochemical energy storage and conversion devices have become a research hotspot for scientists all over the world. As a new type of energy conversion device that converts the chemical energy of substances into electrical energy, fuel cells have received extensive attention and rapid development in recent years. However, the kinetics of the oxygen reduction reaction at the fuel cell cathode is slow, and a catalyst must be used to speed up the reaction process. Traditional electrocatalysts, such as platinum-based no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/10
CPCB01J31/28B01J35/33B01J35/60B01J35/61
Inventor 智林杰周善柯马英杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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