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A kind of method for adjusting nitrogen content in carbon-nitrogen-based single-atom iron catalyst

An iron catalyst, nitrogen-based single technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of catalyst activity reduction, etc., and achieve the effect of simple and effective preparation process

Active Publication Date: 2019-07-12
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the metal particle size is reduced to the atomic size, its specific surface area and surface energy will double, and it is very easy to agglomerate to form large clusters during the preparation and reaction process, resulting in a decrease in catalyst activity

Method used

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  • A kind of method for adjusting nitrogen content in carbon-nitrogen-based single-atom iron catalyst
  • A kind of method for adjusting nitrogen content in carbon-nitrogen-based single-atom iron catalyst
  • A kind of method for adjusting nitrogen content in carbon-nitrogen-based single-atom iron catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 0.04mol 2-aminopyrimidine in 10mL ethanol (95%) solution to form a transparent solution A; add 0.003mol ferric chloride hexahydrate to the transparent solution A, and stir vigorously at room temperature (20-25°C) for 12 -24h; place the mixture in a vacuum drying oven (80-100°C) and dry (2-4h); place the dried mixture in a tube furnace, and pyrolyze it for 2-4h under a nitrogen atmosphere (heating rate 5°C / min, heated to 1000°C), cooled to room temperature to obtain a black solid; use sulfuric acid or hydrochloric acid (2-6mol / L, 80mL) to acidify the obtained black solid at 80-100°C for 12-24h to remove the material Medium-active metal iron and its oxides; then centrifuge and wash the acid-washed material (until the pH value of the lotion reaches 7) and dry (8-12h) in a vacuum drying oven (80-100°C); The dried product is subjected to secondary high-temperature pyrolysis for 2-4h (the temperature rise rate is 5°C / min, and the temperature is raised to 1000°C), and...

Embodiment 2

[0040]Dissolve 0.04mol N-methylimidazole in 10mL ethanol (95%) solution to form a transparent solution A; add 0.003mol ferric chloride hexahydrate to the transparent solution A, and stir vigorously at room temperature (20-25°C) 12-24h; place the mixture in a vacuum drying oven (80-100°C) and dry (2-4h); place the dried mixture in a tube furnace, and pyrolyze it for 2-4h under a nitrogen atmosphere (heating The rate is 5°C / min, the temperature is raised to 1000°C), cooled to room temperature to obtain a black solid; acidify the obtained black solid with sulfuric acid or hydrochloric acid (2-6mol / L, 80mL) at 80-100°C for 12-24h to remove The active metal iron and its oxides in the material; then the acid-washed material is centrifuged, washed (until the pH value of the washing liquid reaches 7) and dried in a vacuum drying oven (80-100°C) (8-12h) The dried product is subjected to secondary high-temperature pyrolysis for 2-4h (the heating rate is 5° C. / min, and the temperature is...

Embodiment 3

[0042] Dissolve 0.04mol 2-benzimidazolyl acetonitrile in 10mL ethanol (95%) solution to form a transparent solution A; Stir vigorously for 12-24h; place the mixture in a vacuum oven (80-100°C) and dry (2-4h); place the dried mixture in a tube furnace, and pyrolyze it for 2-4h under a nitrogen atmosphere (The heating rate is 5°C / min, the temperature is raised to 1000°C), cooled to room temperature to obtain a black solid; use sulfuric acid or hydrochloric acid (2-6mol / L, 80mL) to acidify the obtained black solid at 80-100°C for 12-24h To remove the active metal iron and its oxides in the material; then centrifuge and wash the acid-washed material (until the pH value of the washing liquid reaches 7) and dry it in a vacuum drying oven (80-100°C) (8- 12h); the dried product is subjected to secondary high-temperature pyrolysis for 2-4h (heating rate is 5°C / min, and the temperature is raised to 1000°C), cooled to room temperature, and a Fe-N-C single-atom catalyst with a nitrogen co...

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Abstract

The invention discloses a method for adjusting nitrogen content in carbon-nitrogen based monatomic ferrous catalyst. The carbon-nitrogen based monatomic ferrous catalyst with adjustable nitrogen content is prepared by taking different types of N-containing organic molecules as C / N sources and ferric salt as Fe source; dispersing the N-containing organic molecules and ferric salt in organic solvent; stirring the mixture to make it react; after finishing the reaction, removing solvent and drying components; performing high-temperature pyrolysis on the obtained mixture under the nitrogen atmosphere ( 700-1000 DEG C); performing acidification, centrifugation, washing, drying and other processes on the product; performing the secondary high-temperature pyrolysis on the product to obtain the catalyst. The invention provides a simple and effective preparation method of carbon-nitrogen based monatomic ferrous catalyst with adjustable nitrogen content; the preparation method is simple and economical, and applicable to the industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and energy battery, and more specifically relates to a method for adjusting the nitrogen content in a carbon-nitrogen-based single-atom iron catalyst. Background technique [0002] A fuel cell is a device that directly converts chemical energy in a substance into electrical energy, and the oxygen reduction process at the cathode is an important reaction process of the fuel cell. The performance of the battery is degraded due to the excessively high overpotential due to the oxygen reduction process at the cathode. Therefore, in order to improve the performance of the battery, scientific researchers are looking for and developing a new type of fuel cell cathode electrode material. [0003] At present, Pt and alloy catalysts are one of the best catalysts for oxygen reduction reaction (ORR). However, the high cost of preparation, easy poisoning and deactivation, high overpotential and poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/90H01M4/9041Y02E60/50
Inventor 胡耀娟蔡称心刘正吴萍高源
Owner NANJING NORMAL UNIVERSITY
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