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A nitrogen-doped carbon-oxygen reduction catalyst containing iron ferric oxide particles and its preparation method

A technology of ferroferric oxide and nitrogen-doped carbon, which is applied in the field of catalyst research, can solve the problems of poor oxygen reduction reaction activity, difficulty in recombining ferric oxide and nitrogen-doped carbon, etc., to improve the catalytic activity of oxygen reduction reaction, The preparation process is simple and easy, and the effect of better stability

Active Publication Date: 2015-09-23
EAST CHINA UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This may be because the compounding of ferroferric oxide and nitrogen-doped carbon is difficult, and the hybrid material obtained by physical mixing of pure ferric oxide nanoparticles and nitrogen-doped carbon materials has poor oxygen reduction reaction activity.

Method used

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  • A nitrogen-doped carbon-oxygen reduction catalyst containing iron ferric oxide particles and its preparation method
  • A nitrogen-doped carbon-oxygen reduction catalyst containing iron ferric oxide particles and its preparation method
  • A nitrogen-doped carbon-oxygen reduction catalyst containing iron ferric oxide particles and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 201.3mg of pyrrole monomer and 801.9mg of ferric chloride hexahydrate in 30mL of absolute ethanol respectively, and mix them ultrasonically for 40min. The obtained mixed solution was transferred into a 100mL autoclave, and reacted solvothermally at 180°C for 12h. Then it was naturally cooled to room temperature, the solvothermal product was washed with ethanol centrifugation for 3 times, and dried at 60°C for 12h. The dried solid sample was pyrolyzed at 1000°C in an argon atmosphere and kept for 4 hours. Then cool naturally to room temperature to obtain nitrogen-doped carbon catalyst I containing ferric oxide particles.

[0026] Its X-ray diffraction result of catalyst I prepared in embodiment 1 can be found in figure 1 . Depend on figure 1 It can be seen that the catalyst I prepared in Example 1 contains carbon and ferric oxide in the components.

[0027] The scanning electron microscope result of the catalyst I prepared in embodiment 1 can be found in ...

Embodiment 2

[0033] Replace "201.3 mg of pyrrole monomer and 801.9 mg of ferric chloride hexahydrate in 30 mL of absolute ethanol" with "400 mg of pyrrole monomer and 400 mg of ferric chloride hexahydrate respectively in 30 mL of absolute ethanol" Dissolved in 30mL absolute ethanol", replace the "dried solid sample at 1000°C in an argon atmosphere for high temperature pyrolysis" in Example 1 with "the dried solid sample is subjected to high temperature pyrolysis in an argon atmosphere Carrying out high temperature pyrolysis", the other steps and conditions were the same as in Example 1, and nitrogen-doped carbon catalyst II containing ferric oxide particles was prepared.

[0034] The test method for the oxygen reduction activity of the nitrogen-doped carbon catalyst II containing ferric oxide particles prepared in Example 2 is the same as that in Example 1. The results show that the linear sweep voltammetry test result of the catalyst II prepared in embodiment 2 can be found in Figure 4 ...

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Abstract

The invention relates to a nitrogen-doped carbon oxygen reduction catalyst containing ferroferric oxide particles and a preparation method of the catalyst. The atomic ratio of nitrogen to carbon in the catalyst is (0-0.1): 1, the mass fraction of ferroferric oxide accounting for the total mass of the catalyst is 5-50wt%, and the ferroferric oxide particles have the particle size of 5-500nm; the content of nitrogen in the catalyst is not zero. The nitrogen-doped carbon hybrid material containing the ferroferric oxide particles is prepared by solvothermal and then by a high-temperature calcination method in-situ, so that the problem of difficult compounding between the ferroferric oxide and nitrogen-doped carbon in the prior art can be solved; furthermore, the synergistic coupling action is generated between the formed ferroferric oxide nano-particles and the nitrogen-doped carbon material, so that the catalytic activity of the oxygen reduction reaction can be greatly improved; the method is low in cost and simple and easy in preparation process. In alkaline electrolyte, compared with commercial Pt / C catalyst, the nitrogen-doped carbon catalyst containing the ferroferric oxide particles has equivalent oxygen reduction catalytic activity and better oxygen reduction catalytic stability.

Description

technical field [0001] The invention relates to catalyst research in the field of fuel cells, in particular to a nitrogen-doped carbon-oxygen reduction catalyst containing iron ferric oxide particles and a preparation method thereof. Background technique [0002] The oxygen reduction reaction is a very critical process in sustainable energy devices such as fuel cells and metal-air batteries. So far, platinum-based catalysts are considered to be the most catalytically active oxygen reduction catalysts. However, the high price, limited resources, and poor stability of platinum-based catalysts make it difficult to become a widely used oxygen reduction catalyst. Therefore, the development of efficient non-platinum catalysts has become a research hotspot. [0003] The M-N / C type catalyst (M represents non-noble metal, N represents nitrogen, and C represents carbon) material is considered as a low-cost, high-stability alternative platinum-based catalyst for oxygen reduction reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90B01J27/24
CPCH01M4/9008H01M4/9016Y02E60/50
Inventor 朱以华张建鹏苏云鹤杨晓玲周颖
Owner EAST CHINA UNIV OF SCI & TECH
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