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High-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as preparation method and application thereof

A non-precious metal and catalyst technology, applied in the field of highly active Co-Ni-Fe co-embedded non-precious metal catalyst and its preparation, can solve the problems of low catalyst activity and inability to construct a three-dimensional space structure

Inactive Publication Date: 2021-04-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is relatively simple, however, the activity of the prepared catalyst is not high
[0005] Finally, most of the above methods use metal macrocyclides with only 2D structures to prepare related catalyst precursors, and cannot construct materials with a three-dimensional spatial structure with high specific surface area and uniform microporous structure, and realize the uniform distribution of various metals in it. To form a variety of active sites to prepare highly active catalysts

Method used

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  • High-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as preparation method and application thereof
  • High-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as preparation method and application thereof
  • High-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0032] The MOFs metal source ion Zn and Co, Ni, Fe atomic ratio is controlled at 4:4:3:1, wherein the concentration of MOFs metal source Zn ion is controlled at 4mol L -1 , the organic ligand concentration is 0.15mol L -1 : Preparation of mixed salt solution A: Dissolve 11.9g of zinc nitrate, 9.894g of cobalt sulfate, 8.7g of nickel nitrate, and 1.616g of ferrous acetate in 100mL of anhydrous methanol solution, and mix evenly by ultrasonic; dissolve 1.3g of dimethylimidazole in Obtain solution B in 100mL of anhydrous methanol solution; pour solution A into solution B, stir evenly, place in an oil bath at 100°C, and keep stirring for 12 hours. The reacted product was centrifuged and vacuum-dried at 90°C for 1 h, then placed in a tube furnace under an argon atmosphere at 1100°C for 0.5 h of pyrolysis, and the heating rate was controlled at 5°C min -1 . After pyrolysis, the target product Co-Ni-Fe catalyst is obtained.

[0033] figure 1 It is a comparison chart of the perform...

Embodiment 2

[0036] The metal source ions and Co, Ni, Fe atomic ratio are controlled at 4:2:1:1, wherein the concentration of MOFs metal source ions is controlled at 4mol L -1 , the organic ligand concentration is 0.15mol L -1 : Prepare mixed salt solution A: Aluminum chloride 53.36g, cobalt chloride 5.8g, nickel chloride 2.97g, ferric chloride 4.04g are dissolved in 100mL DMF; 7.2g dihydroterephthalic acid is dissolved in 100mL The solution B was obtained in the DMF solution; the solution A was poured into the solution B, stirred evenly and placed in an oil bath at 20°C, and kept stirring for 48 hours. The reacted product was centrifuged and vacuum-dried at 60°C for 4 hours, then placed in a tube furnace for pyrolysis at 800°C for 3 hours under an argon atmosphere, and the heating rate was controlled at 2°C min -1 . After pyrolysis, the target product Co-Ni-Fe catalyst is obtained.

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Abstract

The invention provides a high-activity Co-Ni-Fe co-inlaid non-noble metal catalyst as well as a preparation method and application thereof. Based on a preparation method of an organic metal framework compound, the high-activity Co-Ni-Fe co-inlaid non-noble metal catalyst is synthesized by optimizing the contents of Co, Ni and Fe. The multi-metal inlaid catalyst has three active sites of Co-N-C, Ni-N-C and Fe-N-C, and after optimization, the Co-Ni-Fe co-inlaid non-noble metal catalyst has no metal agglomeration phenomenon. Besides, due to rich active sites, the catalyst shows excellent electrochemical activity, the half-wave potential in a 0.1 M KOH solution is as high as 0.881 V (vs.RHE), and the half-wave potential in a 0.1 M HCLO4 solution is as high as 0.798 V (vs.RHE), which are far superior to those of a conventional non-noble metal catalyst. The catalyst has a huge application prospect in the aspect of effectively reducing the cost of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the field of non-noble metal catalysts for proton exchange membrane fuel cells, and discloses a highly active Co-Ni-Fe co-embedded non-noble metal catalyst, a preparation method and application thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has become a hotspot of extensive research in recent years due to its advantages of high power density, high conversion efficiency and zero emission. At present, the catalysts used in commercial PEMFC are still Pt-based catalysts. However, the current high cost problem is still the bottleneck restricting the commercialization of PEMFC. To further reduce the cost, the development of non-precious metal catalysts has received extensive attention. Fe-N-C catalysts have become good substitutes for noble metal ORR catalysts due to their good ORR activity. [0003] The methods for preparing non-precious metal catalysts generally include template method, ball mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/755B01J35/10H01M4/90
CPCB01J27/24B01J23/755H01M4/9041B01J35/33B01J35/61Y02E60/50
Inventor 侯明高燕燕艾军郑利民邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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