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A kind of non-precious metal oxygen reduction electrocatalyst and its preparation method and application

An electrocatalyst, non-precious metal technology, used in circuits, electrical components, battery electrodes, etc., can solve problems such as insufficient activity and reduced catalyst active site density, and achieve the effect of high oxygen reduction performance

Active Publication Date: 2020-08-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The common preparation method of Fe-N-C catalyst is to mix iron salt, nitrogen source and carbon source and then conduct heat treatment under an inert atmosphere. Lead to a decrease in the active site density of the catalyst and insufficient activity

Method used

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  • A kind of non-precious metal oxygen reduction electrocatalyst and its preparation method and application
  • A kind of non-precious metal oxygen reduction electrocatalyst and its preparation method and application
  • A kind of non-precious metal oxygen reduction electrocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 2.03g ferric chloride hexahydrate in a beaker, add 25ml DMF, stir to form a solution, weigh 0.618g terephthalic acid in a beaker, add 25ml DMF, stir to form a solution, slowly pour the ferric chloride solution into the terephthalic acid solution, continue to stir for 30 minutes, then transfer to the reactor and heat to 110 ° C for 8 hours. After the reaction, the reactor is cooled to room temperature, and the product is obtained by centrifugation, and washed with ethanol three times to remove the residual solvent. Thus MIL-101(Fe) was obtained. At 20°C, 1.470g of zinc nitrate hexahydrate and 3.260g of 2-methylimidazole were dissolved in 50ml of methanol respectively, and the former was slowly added to the latter under stirring, continued to stir for 12min, and then stood still for 20h. Centrifuge, wash three times, and dry in vacuum at 150° C. for 8 hours to obtain ZIF-8. Mix MIL-101(Fe) and ZIF-8 at a mass ratio of 1:10 and ball mill for 8h, then transfer to a c...

Embodiment 2

[0035] Weigh 2.03g ferric chloride hexahydrate in a beaker, add 25ml DMF, stir to form a solution, weigh 0.618g terephthalic acid in a beaker, add 25ml DMF, stir to form a solution, slowly pour the ferric chloride solution into the terephthalic acid solution, continue to stir for 30 minutes, then transfer to the reactor and heat to 110 ° C for 8 hours. After the reaction, the reactor is cooled to room temperature, and the product is obtained by centrifugation, and washed with ethanol three times to remove the residual solvent. Thus MIL-101(Fe) was obtained. At 20°C, 1.470g of zinc nitrate hexahydrate and 3.260g of 2-methylimidazole were dissolved in 50ml of methanol respectively, and the former was slowly added to the latter under stirring, continued to stir for 12min, and then stood still for 20h. Centrifuge, wash three times, and dry in vacuum at 150° C. for 8 hours to obtain ZIF-8. Mix MIL-101(Fe) and ZIF-8 at a mass ratio of 1:5 and ball mill for 8h, then transfer to a co...

Embodiment 3

[0038] Weigh 2.03g ferric chloride hexahydrate in a beaker, add 25ml DMF, stir to form a solution, weigh 0.618g terephthalic acid in a beaker, add 25ml DMF, stir to form a solution, slowly pour the ferric chloride solution into the terephthalic acid solution, continue to stir for 30 minutes, then transfer to the reactor and heat to 110 ° C for 8 hours. After the reaction, the reactor is cooled to room temperature, and the product is obtained by centrifugation, and washed with ethanol three times to remove the residual solvent. Thus MIL-101(Fe) was obtained. At 20°C, 1.470g of zinc nitrate hexahydrate and 3.260g of 2-methylimidazole were dissolved in 25ml of methanol respectively, and the former was slowly added to the latter under stirring, continued to stir for 12min, and then stood still for 20h. Centrifuge, wash three times, and dry in vacuum at 150° C. for 8 hours to obtain ZIF-8. Mix MIL-101(Fe) and ZIF-8 at a mass ratio of 1:10 and ball mill for 8h, then transfer to a c...

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Abstract

The present invention relates to a preparation method of a non-noble metal oxygen reduction electrocatalyst. The catalyst is obtained by mechanically mixing a ferrous metal organic skeleton and an N-containing metal organic skeleton and then performing further pyrogenation, and the catalyst has high electro-catalysis oxygen reduction activity in the acidic and alkaline electrolytes. Compared to the prior art, the ferrous metal organic skeleton is taken as a Fe source to ensure that Fe in the finally obtained catalyst is existed in a highly dispersed single atom mode. The space structure of theN-containing metal organic skeleton can be retained after the heat treatment to form an N-doped carbon carrier with a high specific surface used as a high-density active site. The catalyst with a high oxygen reduction performance, good stability and a methanol tolerance performance has wide application prospects in a polymer film electrolyte fuel cell and a metal air cell.

Description

technical field [0001] The invention belongs to the technical field of oxygen reduction electrocatalyst and its preparation, and in particular relates to an electrocatalyst for the cathode oxygen reduction reaction of a polymer electrolyte membrane fuel cell or a metal-air fuel cell. Background technique [0002] Electrocatalytic oxygen reduction is an electrochemical reaction that occurs at the cathode of polymer electrolyte membrane fuel cells and metal-air batteries, and plays a very important role. Usually, the electrocatalyst for oxygen reduction is a platinum-based catalyst. Due to the limited reserves of platinum, the commercialization of fuel cells has been greatly restricted. Therefore, non-noble metal oxygen reduction catalysts have been developed to replace them. Among them, Fe-N-C catalysts have the most application prospects. [0003] The common preparation method of Fe-N-C catalyst is to mix iron salt, nitrogen source and carbon source and then conduct heat tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 孙公权许新龙王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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