Non-precious metal oxygen reduction catalyst and preparing method and application thereof

A non-precious metal, catalyst technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. and other problems, to achieve the effect of easy mass production, easy control of feeding amount and low cost

Inactive Publication Date: 2016-02-03
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key cathode oxygen reduction reaction has slow kinetics and requires rare noble metals as catalysts, which seriously hinders the wide application of fuel cells.
Many people have begun to use precious metals and othe

Method used

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  • Non-precious metal oxygen reduction catalyst and preparing method and application thereof
  • Non-precious metal oxygen reduction catalyst and preparing method and application thereof
  • Non-precious metal oxygen reduction catalyst and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, preparation and performance test of non-precious metal oxygen reduction catalyst

[0033] After ultrasonically dispersing 20 mg of carbon nanotubes (40 to 60 nanometers in diameter and 5 to 15 microns in length) in 10 mL of water for 1 hour, add 800 mg of glucose and 600 mg of ferric nitrate nonahydrate, and transfer them to 25 mL for polymerization after being completely dissolved. In a high-pressure reactor lined with tetrafluoroethylene, then carry out hydrothermal reaction at a temperature of 180°C for 15 hours, wash with water and ethanol several times, and filter with suction to obtain a solid, which is dried overnight at 60°C to obtain a precursor ; After mixing the precursor and melamine at a mass ratio of 1:10, transfer it to a porcelain boat, and put it into a quartz tube of a tube furnace, deair it with argon for half an hour, and then raise the temperature to 900°C. After heat treatment for 2 hours under the protection of argon, a non-noble met...

Embodiment 2

[0041] Embodiment 2, preparation and performance test of non-precious metal oxygen reduction catalyst

[0042] A non-noble metal oxygen reduction catalyst was prepared basically in the same manner as in Example 1, except that the amount of iron salt was changed from 600 mg to 200 mg, and the obtained catalyst contained almost no metallic iron or carbonized carbon coated with graphite carbon. Iron nanoparticles, containing only FeN 4 Coordination structure; the half-wave potential obtained by testing the oxygen reduction curve in 0.1 mole per liter of potassium hydroxide solution is 0.862V.

Embodiment 3

[0043] Embodiment 3, preparation and performance test of non-precious metal oxygen reduction catalyst

[0044] A non-noble metal oxygen reduction catalyst was prepared basically in the same manner as in Example 1, except that the amount of iron salt was changed from 600 mg to 1000 mg, and the catalyst obtained was similar in composition to the catalyst obtained in Example 1, but metal iron or The particle size of the iron carbide nanoparticles increases obviously; the half-wave potential obtained by testing the oxygen reduction curve in 0.1 mole per liter of potassium hydroxide solution is 0.885V.

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Abstract

The invention discloses a non-precious metal oxygen reduction catalyst and a preparing method and application thereof. The preparing method comprises the following steps that 1, conductive carbon is dispersed into water, and a carbon source and ferric salt are added to carry out a hydrothermal reaction, so that a precursor is obtained; 2, heat treatment is carried out on the precursor and a nitrogen source to obtain the non-precious metal oxygen reduction catalyst. An iron source is dispersed into a solution phase, a hydrothermal method is used for compounding the iron source and an obtained carbon layer, then high-temperature treatment is carried out, nitrogen is doped to prepare a FeN4 active site, and compared with other methods of directly mixing the iron source with the carbon source and the nitrogen source in a solid phase mode, the method is more uniform in compounding, and effectively prevents iron atoms from aggregating at high temperature and growing up; moreover, the hydrothermal method and high-temperature treatment are convenient to control. The prepared catalyst is excellent in catalytic performance and has higher oxygen reduction activity compared with that of other existing non-precious metal catalysts.

Description

technical field [0001] The invention relates to a non-noble metal oxygen reduction catalyst and its preparation method and application, belonging to the field of fuel cell catalysts. Background technique [0002] In recent years, the problems of energy crisis and environmental pollution have been paid more and more attention by countries all over the world. Fuel cell is a clean and non-polluting power generation device with extremely high energy conversion efficiency, so it plays a pivotal role in solving these two problems. However, the key cathode oxygen reduction reaction has slow kinetics and requires rare noble metals as catalysts, which seriously hinders the wide application of fuel cells. Many people have begun to use precious metals and other transition metals to form alloys or special structures such as core-shell to increase the utilization rate of precious metals and reduce their loading, but this still cannot get rid of the limitations of precious metals themsel...

Claims

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Application Information

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IPC IPC(8): B01J31/18B01J37/08H01M4/88H01M4/92
CPCY02E60/50
Inventor 胡劲松江文杰万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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