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Preparation method of pyrrole-derived monatomic iron-based nitrogen-carbon material for oxygen reduction

An iron-based nitrogen and carbon material technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of easy agglomeration of metal atoms, complicated preparation process, low current density, etc. The effect of good performance, simple operation and high limiting current density

Inactive Publication Date: 2020-12-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to synthesize a single-atom iron-based nitrogen-carbon material with high stability and high catalytic performance, thereby solving the problems of easy aggregation of metal atoms, low current density, poor stability and complicated preparation process existing in existing catalysts

Method used

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  • Preparation method of pyrrole-derived monatomic iron-based nitrogen-carbon material for oxygen reduction
  • Preparation method of pyrrole-derived monatomic iron-based nitrogen-carbon material for oxygen reduction
  • Preparation method of pyrrole-derived monatomic iron-based nitrogen-carbon material for oxygen reduction

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preparation example Construction

[0029] A general preparation method of a single-atom iron-based nitrogen-carbon material and its application as a good catalyst for oxygen reduction, the preparation steps are as follows:

[0030] (1) adding an iron source compound and a zinc source compound to the hydrophilic solution to obtain a metal-organic solution of a certain concentration;

[0031] (2) add polymer monomer to the mixed system in step 1;

[0032] (3) stirring and reacting the mixed system in step 2 for a certain period of time to obtain a reaction product, washing and drying the product to obtain a metal-containing polymer;

[0033] (4) The product obtained in step 3 is calcined at a certain temperature for a certain period of time, and then naturally cooled to room temperature to prepare a monoatomic iron-based nitrogen-carbon material.

Embodiment 1

[0035] (1) Take a clean 200mL beaker and add 100mL of anhydrous methanol to the beaker.

[0036] (2) 500 mg of ferric nitrate nonahydrate and 15 g of zinc nitrate hexahydrate were simultaneously added to the methanol solution in step (1), and an orange clear solution was obtained under stirring.

[0037] (3) Add 1000 μL of pyrrole to the clear solution obtained in step 2, and react under stirring for 24 hours to obtain a dark blue turbid solution.

[0038] (4) The turbid solution in step (3) was centrifuged and washed several times with ethanol and deionized water, and the product obtained by suction filtration was dried at 80° C. for 12 hours.

[0039] (5) Calcining the dried product obtained in step (4) at 900° C. for 3 h under an argon atmosphere.

Embodiment 2

[0041] (1) Take a clean 200mL beaker and add 100mL of anhydrous methanol to the beaker.

[0042] (2) Add 500 mg of ferric nitrate nonahydrate into the methanol solution in step (1), and stir to obtain an orange clear solution.

[0043] (3) Add 1000 μL of pyrrole to the clear solution obtained in step 2, and react under stirring for 24 hours to obtain a dark blue turbid solution.

[0044] (4) The turbid solution in step (3) was centrifuged and washed several times with ethanol and deionized water, and the product obtained by suction filtration was dried at 80° C. for 12 hours.

[0045] (5) Calcining the dried product obtained in step (4) at 900° C. for 3 h under an argon atmosphere.

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Abstract

The invention relates to a universal preparation method of a monatomic iron-based nitrogen-carbon material and application of the monatomic iron-based nitrogen-carbon material as an oxygen reduction reaction catalyst material. The preparation method comprises the following steps: dissolving an iron source compound and a zinc source compound in a hydrophilic solution, adding a pyrrole monomer, violently performing stirring for a certain period of time to form a uniformly mixed solution, centrifugally washing the product with deionized water and ethylene glycol for multiple times, performing drying to obtain a product, and calcining the product to obtain the final product. The method has the advantages that the operation is simple, the cost is low, the reaction conditions are mild, the wholereaction is carried out at normal temperature and normal pressure without an additional pickling process, the product is uniform in size and morphology and good in dispersity, and agglomeration of metal particles is not found. As an oxygen reduction reaction catalyst, the material has high conductivity, rich active sites and excellent electrocatalytic activity, and is an ideal oxygen reduction reaction catalytic material with a wide commercial application prospect.

Description

technical field [0001] The invention belongs to the field of single-atom materials, in particular to the preparation of iron single-atom materials based on pyrrole polymerization. Background technique [0002] With the continuous development of human society, traditional fossil energy is being exhausted due to excessive use, and the resulting environmental pollution is becoming more and more serious. People gradually realize the importance of developing sustainable new energy and efficient energy conversion technology. Among these new devices, fuel cells and rechargeable metal-air batteries are two methods that have attracted much attention, but due to the high price of noble metal catalysts, they have not been able to achieve large-scale promotion and application. Therefore, the development of economical and efficient oxygen reduction catalysts has become the focus of promoting the practicality and scale of fuel cells and metal-air batteries. [0003] Non-precious metal ca...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/394B01J35/33
Inventor 曹传宝姚秀云
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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