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Cobalt-containing monatomic catalyst as well as macro preparation method and application thereof

A catalyst and atom technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the complex and difficult to control the preparation process of cobalt single-atom catalysts, the low yield of cobalt single-atom catalysts, and the unfriendly environment. and other problems, to achieve the effects of efficient atomic utilization, high cost-effectiveness of raw materials, and convenient operation.

Pending Publication Date: 2022-05-03
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the differences in the prior art, the present invention provides a cobalt-containing single-atom catalyst and its macro-preparation method and application, aiming to solve the complex and difficult-to-control preparation process of the existing cobalt single-atom catalyst, high energy consumption, and post-treatment. Environmentally unfriendly or the relatively low yield of cobalt single-atom catalysts produced

Method used

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  • Cobalt-containing monatomic catalyst as well as macro preparation method and application thereof
  • Cobalt-containing monatomic catalyst as well as macro preparation method and application thereof
  • Cobalt-containing monatomic catalyst as well as macro preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] A method for the macro-preparation of a cobalt-containing single-atom catalyst, comprising the following steps:

[0036] 1) Disperse 1 mmol of 3-aminophenol and 2 mmol of hexamethylenetetramine in water, add 0.2 mmol of cetyltrimethylammonium bromide as a shape-directing agent, react at 85°C for 24 hours, and freeze-dry Obtain phenolic resin fiber;

[0037] 2) Weigh 0.3g of phenolic resin fiber, add 30 mL of 0.1 mol / L cobalt nitrate mixed solution, stir at 25°C for 12 hours at a stirring speed of 200 r / min, centrifuge and freeze-dry the precipitate and freeze-dry the obtained product In an inert atmosphere, the carbonization temperature is 900°C, and the temperature is kept for 60 minutes to obtain the cobalt-containing single-atom catalyst, which is denoted as Co-SA@N-CNFs;

[0038] 3) Increasing the feed amount of the precursor and using a larger reactor can realize the macro-production of cobalt-containing single-atom catalysts, such as Figure 5 shown.

[0039]...

Embodiment 2

[0051] A method for the macro-preparation of a cobalt-containing single-atom catalyst, comprising the following steps:

[0052] 1) Disperse 1 mmol of 3-aminophenol and 1 mmol of hexamethylenetetramine in water, add 0.2 mmol of cetyltrimethylammonium bromide as a shape-directing agent, react at 85°C for 24 hours, and freeze-dry Obtain phenolic resin fiber;

[0053] 2) Weigh 0.3g of phenolic resin fiber, add 30 mL of 0.1 mol / L cobalt nitrate mixed solution, stir at 25°C for 12 hours at a stirring speed of 200 r / min, centrifuge and freeze-dry the precipitate and freeze-dry the obtained product In an inert atmosphere, the carbonization temperature is 900° C., and the temperature is kept for 60 minutes to obtain the final product.

Embodiment 3

[0055] A method for the macro-preparation of a cobalt-containing single-atom catalyst, comprising the following steps:

[0056] 1) Disperse 1 mmol of 3-aminophenol and 3 mmol of hexamethylenetetramine in water, add 0.2 mmol of cetyltrimethylammonium bromide as a shape-directing agent, react at 85°C for 24 hours, and freeze-dry Obtain phenolic resin fiber;

[0057] 2) Weigh 0.3g of phenolic resin fiber, add 30 mL of 0.1 mol / L cobalt nitrate mixed solution, stir at 25°C for 12 hours at a stirring speed of 200 r / min, centrifuge and freeze-dry the precipitate and freeze-dry the obtained product In an inert atmosphere, the carbonization temperature is 900° C., and the temperature is kept for 60 minutes to obtain the final product.

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Abstract

The invention discloses a cobalt-containing monatomic catalyst as well as a macro preparation method and application thereof. The preparation method comprises the following specific steps: 1) dispersing 3-aminophenol and hexamethylenetetramine in water, and reacting at 75-95 DEG C for 24 hours by taking hexadecyl trimethyl ammonium bromide as a morphology guiding agent, so as to obtain phenolic resin fibers; and 2) stirring the obtained phenolic resin fiber and a cobalt salt solution at normal temperature for 12 hours at the stirring speed of 200rpm, centrifuging, taking the precipitate, freeze-drying, carbonizing the freeze-dried product to 800-950 DEG C in an inert atmosphere, and keeping the temperature for 60 minutes to obtain the cobalt-containing monatomic catalyst. Compared with the prior art, the method disclosed by the invention is simple to operate and easy for large-scale production, and the prepared carbon nanofiber loaded cobalt monatomic material has the advantages of maximized atom utilization rate, unique electronic structure, good conductivity, high catalytic activity and the like.

Description

technical field [0001] The invention belongs to the technical field of oxygen reduction catalysts, and in particular relates to a cobalt-containing single-atom catalyst and a macro-scale preparation method and application thereof. Background technique [0002] In recent years, with the combustion of fossil fuels causing CO 2 The country has proposed the concept of carbon neutrality and carbon peaking. In order to achieve this goal, research on electrochemical energy conversion devices has become particularly important. Common ones include: fuel cells, electrolyzed water devices, metal-air batteries, etc. Among them, metal-air batteries have attracted extensive attention from researchers because of their high theoretical energy density, high safety, and no pollution. [0003] The oxygen reduction reaction is used as the cathode reaction of the zinc-air battery. In the alkaline electrolyte, oxygen molecules get electrons and are reduced to OH. - , because the ORR reaction is...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B11/091
CPCB01J27/24C25B11/091B01J35/33
Inventor 徐林张思可王睿方琳雅周光耀唐亚文孙冬梅
Owner NANJING NORMAL UNIVERSITY
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