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Regularly coordinated cobalt or iron-doped cobalt-based electrocatalyst and its preparation and use

An electrocatalyst, iron doping technology, applied in fuel cell type half cells and secondary cell type half cells, circuits, electrical components, etc. Clear and clear, coordination rules, fast response effect

Active Publication Date: 2022-06-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. The structure of the prepared single-atom catalyst is not clear, and it often requires extremely advanced characterization methods such as synchrotron radiation and spherical aberration electron microscopy to confirm the coordination state of the metal

Method used

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  • Regularly coordinated cobalt or iron-doped cobalt-based electrocatalyst and its preparation and use
  • Regularly coordinated cobalt or iron-doped cobalt-based electrocatalyst and its preparation and use
  • Regularly coordinated cobalt or iron-doped cobalt-based electrocatalyst and its preparation and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A preparation method of a regularly coordinated cobalt-based electrocatalyst, comprising the following steps:

[0075] A. Mix 4.37g of cobalt nitrate hexahydrate with a certain amount of formamide, stir to dissolve it, and obtain 30ml of pink solution, which is recorded as the first solution, and the concentration of the formamide solution of cobalt salt is: 0.5M.

[0076] B, feed ammonia into a certain amount of formamide until the concentration of ammonia is 0.5M, measure the formamide solution of 30ml of ammonia, and denote it as the second solution.

[0077] C. Pour the first solution into the second solution, stir and mix evenly, place in a polytetrafluoroethylene reaction kettle, and heat to 160 degrees Celsius in an oven for 6 hours.

[0078] D. After the reaction is finished, the temperature is naturally cooled, the solid-liquid mixture is taken out, the solid-liquid mixture is separated by centrifugation, the solid product is collected, and the solid product is...

Embodiment 2

[0087] A preparation method of a regularly coordinated cobalt-based electrocatalyst, comprising the following steps:

[0088] A. Mix 1.75g ​​of cobalt nitrate hexahydrate with a certain amount of formamide, stir to dissolve it, and obtain 60ml of pink solution, which is recorded as the first solution, and the concentration of the formamide solution of cobalt salt is 0.1M.

[0089] B. Mix 4ml of ethylenediamine with a certain amount of formamide, and stir evenly to obtain 30ml of solution, which is designated as the second solution, and the concentration of the formamide solution of ethylenediamine is 2M;

[0090] C. Pour the first solution into the second solution, stir and mix evenly, place in a polytetrafluoroethylene reaction kettle, and heat to 210 degrees Celsius in an oven for 12 hours.

[0091] D. After the reaction is finished, the temperature is naturally cooled, the solid-liquid mixture is taken out, the solid-liquid mixture is separated by centrifugation, the solid ...

Embodiment 3

[0098] A preparation method of a regularly coordinated cobalt-based electrocatalyst, comprising the following steps:

[0099] A. Mix 17.46g of cobalt nitrate hexahydrate with a certain amount of formamide, stir to dissolve it, and obtain 30ml of dark red solution, which is denoted as the first solution, and the formamide solution concentration of cobalt salt is 2M.

[0100] B. Mix 0.12g of sodium hydroxide with a certain amount of formamide, stir to dissolve it, and obtain 30ml of dissolved

[0101] solution, denoted as the second solution. The concentration of sodium hydroxide in formamide solution is 0.1M;

[0102] C. Pour the first solution into the second solution, stir and mix evenly, place in a polytetrafluoroethylene reactor, heat to 110 degrees Celsius, and keep for 24 hours.

[0103] D. After the reaction is finished, the temperature is naturally cooled, the solid-liquid mixture is taken out, the solid-liquid mixture is separated by centrifugation, the solid product...

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Abstract

The invention belongs to the field of preparation of catalyst materials, and in particular relates to a regularly coordinated cobalt or iron-doped cobalt-based electrocatalyst and its preparation method and application. The electrocatalyst is a crystalline material, which belongs to a simple cubic crystal system. The eight vertices of the unit cell are cobalt or isomorphously substituted iron, and the metal atoms are in a 6-coordination structure, which is connected by its ligand cyanide (-CN) , that is, each side of the unit cell is connected to the cyano group formed by C and N, the unit cell parameter is α=β=γ=90°, and the crystal can present a monodisperse regular cube, Truncated cubic or octahedral morphology. The catalyst has excellent crystallinity, regular and single coordination, has a single-site active center, and the reaction site is clear and definite, which can be used for the study of crystal face-dependent catalytic activity. The catalyst has excellent catalytic activity and stability as a working electrode for oxygen reduction, oxygen evolution, hydrazine hydrate oxidation, metal-air battery and hydrazine hydrate fuel cell.

Description

technical field [0001] The invention belongs to the field of preparation of catalytic materials, in particular to a cobalt- or iron-doped cobalt-based electrocatalyst with regular coordination and a preparation method and application thereof. Background technique [0002] In recent years, single-atom catalysts have been widely used in various fields due to their extremely high catalytic activity, such as electrochemical catalysis, electrochemical energy storage, and photoelectric catalysis. At present, there are many preparation methods of single-atom catalysts, but there are the following problems: [0003] 1. The preparation process is more complicated, and most of them require high-temperature pyrolysis of a specific heating instrument to obtain higher conductivity. Therefore, it is difficult to realize large-scale preparation, and the energy consumption of the preparation process is extremely high. [0004] 2. In order to ensure the single atomicity of the single-atom ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/08
CPCH01M4/9091H01M12/08
Inventor 孙晓明孙恺田书博
Owner BEIJING UNIV OF CHEM TECH
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