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Novel iron-nickel-nitrogen co-doped carbon catalyst as well as preparation method and application thereof

A carbon catalyst and co-doping technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of slow charging process, unsatisfactory OER performance, and loss of competitiveness of zinc-air batteries. problems, to achieve uniform distribution of active sites, high stability, and well-developed pores.

Active Publication Date: 2020-05-29
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although Pt, RuO 2 and IrO 2 It has been proven to have excellent ORR / OER activity, but the disadvantages of low stability and high cost have made it gradually lose its competitiveness
In the past few years, transition metal-nitrogen-carbon (M-N-C) especially Fe-N-C and Co-N-C have been found to be promising ORR catalysts, however, the OER performance of these two catalysts is not ideal, which will lead to Zinc-air batteries charge slowly

Method used

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  • Novel iron-nickel-nitrogen co-doped carbon catalyst as well as preparation method and application thereof
  • Novel iron-nickel-nitrogen co-doped carbon catalyst as well as preparation method and application thereof
  • Novel iron-nickel-nitrogen co-doped carbon catalyst as well as preparation method and application thereof

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preparation example Construction

[0052] A preparation method of a novel iron-nickel-nitrogen co-doped carbon catalyst, the method comprising the steps of:

[0053] 1) The triaryl imidazolium aniline derivative (TPI-NH 2 ) is dissolved in a mixed solvent, and oxidative polymerization is carried out in the presence of an oxidizing agent to obtain a polyaniline derived polymer (TPANI).

[0054] 2) Dissolving the polyaniline-derived polymer (TPANI) obtained in step 1), iron source and nickel source in a solvent, and then adding melamine for mixing reaction to obtain a TPANI / melamine / Ni-Fe mixture.

[0055] 3) The TPANI / melamine / Ni-Fe mixture obtained in step 2) is heat-treated under the protection of a protective gas atmosphere to obtain an iron-nickel-nitrogen co-doped carbon catalyst (NiFe / N-C).

[0056] As preferably, step 1) is specifically: proportioning the triaryl imidazolium aniline derivative (TPI-NH 2 ) is dissolved in the first solvent. Then add an oxidizing agent (such as ammonium persulfate) and c...

Embodiment 1

[0066] 1) Preparation of polyaniline derived polymer (TPANI):

[0067] Weigh 4.0g (12.8mmol) TPI-NH 2Dissolve in a mixed solvent of 40ml of ethanol and 80ml of 1M HCl; then slowly drop into 60ml of 1M HCl aqueous solution with 2.98g (12.8mmol) of ammonium persulfate dissolved in it under stirring, and react at room temperature for 48h. After the reaction, the system was poured into a large amount of water, the product was collected by suction filtration, extracted with acetone for 48 hours, washed three times with 1M ammonia water and distilled water successively, and dried to obtain a triaryl imidazole polyaniline derivative polymer (TPANI).

[0068] 2) Preparation of TPANI / melamine / Ni-Fe mixture:

[0069] Weigh 2g (6.43mmol) TPANI and dissolve in THF / H 2 O mixed solvent (V THF / V H2O =2 / 1); then add 0.84g (2.88mmol) nickel nitrate hexahydrate and 0.38g (0.96mmol) ferric nitrate nonahydrate, reflux reaction 5h; then add 20g melamine again in reaction system and continue r...

Embodiment 2

[0073] 1) Preparation of polyaniline derived polymer (TPANI):

[0074] Weigh 5.0g (16mmol) TPI-NH 2 Dissolve in a mixed solvent of 50ml ethanol and 100ml 1M HCl; then slowly drop into 80ml of 1M HCl aqueous solution dissolved with 3.725g (16mmol) ammonium persulfate under stirring, and react at room temperature for 48h. After the reaction, the system was poured into a large amount of water, the product was collected by suction filtration, extracted with acetone for 48 hours, washed three times with 1M ammonia water and distilled water, and dried to obtain a triaryl imidazole polyaniline derivative polymer (TPANI).

[0075] 2) Preparation of TPANI / melamine / Ni-Fe mixture:

[0076] Weigh 2.4g (7.72mmol) TPANI and dissolve in THF / H 2 O mixed solvent (V THF / V H2O =2 / 1); then add 1.01g (3.46mmol) nickel nitrate hexahydrate and 0.46g (1.15mmol) ferric nitrate nonahydrate, reflux reaction 8h; then add 24g melamine to the reaction system and continue reflux reaction 8h. After the...

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Abstract

The invention discloses a novel iron-nickel-nitrogen co-doped carbon catalyst. The catalyst is prepared by the following steps: firstly, carrying out oxidative polymerization reactions on a triaryl imidazole aniline derivative (TPI-NH2) to obtain a triaryl imidazole polyaniline derivative polymer (TPANI); mixing TPANI, an iron source, a nickel source and melamine to carry out reactions to obtain aTPANI / melamine / Ni-Fe mixture; and finally, carrying out a heat treatment on the TPANI / melamine / Ni-Fe mixture in a protective gas atmosphere to obtain the iron-nickel-nitrogen co-doped carbon catalyst(NiFe / N-C). The iron-nickel-nitrogen co-doped carbon catalyst has a large specific area and abundant pore structures, and shows excellent ORR and OER catalytic activities in the application of zinc-air batteries at the same time.

Description

technical field [0001] The invention relates to an electrocatalyst, in particular to a novel iron-nickel-nitrogen co-doped carbon catalyst and its preparation method and application, and belongs to the field of oxygen reduction and oxygen precipitation catalysts for zinc-air batteries. Background technique [0002] Metal-air batteries have attracted a lot of research attention due to their wide application in hearing aids, flashlights, clocks and toys, and some other portable devices. The metal anode materials currently used for metal-air batteries mainly include cadmium, zinc, lithium, aluminum, magnesium, etc. Among them, zinc, which is rich in content, low in cost and environmentally friendly, is the most favored by researchers. The theoretical energy density of zinc-air batteries can reach 1350Whkg -1 , 6 times that of lithium-air batteries, and at the same time, zinc-air batteries have a longer shelf life than traditional batteries. [0003] With the intensification o...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10H01M4/90
CPCB01J27/24H01M4/9041H01M4/9083B01J35/61Y02E60/50
Inventor 黎华明李叙锋陈红飙
Owner XIANGTAN UNIV
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