Iron-containing monatomic catalyst and application thereof

A catalyst and atom technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of complex and difficult to control the preparation process, unfriendly environment, high energy consumption, improve chemical reaction sites, good electrical conductivity, graphite good effect

Pending Publication Date: 2022-07-29
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems that the preparation process of the existing iron single-atom catalyst is complex and difficult to control, high energy consumption, post-treatment is not friendly to the environment, or the yield of the prepared iron single-atom catalyst is relatively low, the present invention provides an iron-containing single-atom catalyst Catalyst and its application, the iron-containing single-atom catalyst is a uniform nanosphere with a diameter of 40 nm ± 1 nm, and can be prepared in large quantities by existing methods

Method used

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  • Iron-containing monatomic catalyst and application thereof
  • Iron-containing monatomic catalyst and application thereof
  • Iron-containing monatomic catalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] An iron-containing single-atom catalyst, comprising the following steps:

[0036] 1) Disperse 1 mmol 3-aminophenol and 2 mmol hexamethylenetetramine in water, add 0.2 mmol cetyltrimethylammonium bromide as a morphology directing agent, react at 100 °C for 24 h, and freeze-dried to obtain phenolic resin balls;

[0037] 2) Weigh 0.3 g of phenolic resin balls, add 30 mL of 0.1 mol / L ferric nitrate mixed solution, stir at 25 °C for 16 h, stirring at a speed of 200 rpm, centrifuge and freeze-dry the precipitate and freeze-dry the resulting product in an inert The carbonization temperature in the atmosphere was 800° C., and the temperature was kept for 60 min to obtain the iron-containing single-atom catalyst, denoted as Fe-SA@N-CSs.

[0038] The TEM results of the phenolic resin obtained in step 1) of this example are as follows figure 1 As shown, the results show that the precursor material is a uniform nanosphere structure. like figure 2 and image 3 The SEM and HR-T...

Embodiment 2

[0049] A macro-scale preparation method of an iron-containing single-atom catalyst, comprising the following steps:

[0050] 1) Disperse 1 mmol 3-aminophenol and 1 mmol hexamethylenetetramine in water, add 0.2 mmol cetyltrimethylammonium bromide as a morphology directing agent, react at 100 °C for 24 h, and freeze-dried to obtain phenolic resin balls;

[0051] 2) Weigh 0.3 g of phenolic resin balls, add 30 mL of 0.1 mol / L ferric nitrate mixed solution, stir at 25 °C for 16 h, stirring at a speed of 200 rpm, centrifuge and freeze-dry the precipitate and freeze-dry the resulting product in an inert The carbonization temperature in the atmosphere was 800° C., and the temperature was maintained for 60 min, to obtain the final product.

Embodiment 3

[0053] A macro-scale preparation method of an iron-containing single-atom catalyst, comprising the following steps:

[0054] 1) Disperse 1 mmol 3-aminophenol and 3 mmol hexamethylenetetramine in water, add 0.2 mmol cetyltrimethylammonium bromide as a morphology directing agent, react at 100 °C for 24 h, and freeze-dried to obtain phenolic resin balls;

[0055] 2) Weigh 0.3 g of phenolic resin balls, add 30 mL of 0.1 mol / L ferric nitrate mixed solution, stir at 25 °C for 16 h, stirring at a speed of 200 rpm, centrifuge and freeze-dry the precipitate and freeze-dry the resulting product in an inert The carbonization temperature in the atmosphere was 800° C., and the temperature was maintained for 60 min, to obtain the final product.

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Abstract

The invention discloses an iron-containing monatomic catalyst and application thereof. The iron-containing monatomic catalyst is in a monodisperse spherical shape, the surface is smooth, the diameter is 40 nm +/-1 nm, and the uniform spherical shape of matrix resin is inherited, which shows that phenolic resin spheres are ideal precursors for producing carbon materials. The preparation method comprises the following steps: dispersing 3-aminophenol and hexamethylenetetramine in water, and reacting at 100 DEG C for 24 hours by taking hexadecyl trimethyl ammonium bromide as a morphology guiding agent to obtain phenolic resin spheres; and stirring the obtained phenolic resin spheres and an iron salt solution at normal temperature for 12-24 hours at the stirring speed of 200rpm, centrifuging, taking the precipitate, freeze-drying, carbonizing the freeze-dried product in an inert atmosphere, and preserving heat for 60 minutes. 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 nanosphere loaded iron 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 an iron-containing single-atom catalyst and applications thereof. Background technique [0002] In recent years, with the continuous consumption of fossil fuels, CO 2 In order to achieve this goal, the research on electrochemical energy conversion devices has become particularly important. The common ones are: fuel cells, water electrolysis devices, metal-air batteries, etc. Among them, metal-air batteries have received extensive attention from researchers due to their high theoretical energy density, high safety, and no pollution. Among them, the theoretical energy density of zinc-air batteries ((1218 W·h·kg -1 ) is about three times that of lithium-ion batteries, but the preparation cost is relatively low. Therefore, zinc-air batteries are considered to be promising to replace lithium-ion batteries in future energy applications. Oxygen reduction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9083
Inventor 徐林张思可方琳雅王睿周光耀唐亚文孙冬梅
Owner NANJING NORMAL UNIVERSITY
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