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A kind of nitrogen-doped carbon catalyst and its preparation method and application

A nitrogen-doped carbon and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as homogeneous doping of difficult nitrogen atoms

Active Publication Date: 2021-04-30
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Post-doping pretreats the carbon-based precursor first, and then introduces nitrogen atoms through pyrolysis with the nitrogen-rich precursor. Because of the incompatibility of the two precursors, it is difficult to achieve the incorporation of nitrogen atoms into homogeneous doping

Method used

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  • A kind of nitrogen-doped carbon catalyst and its preparation method and application
  • A kind of nitrogen-doped carbon catalyst and its preparation method and application
  • A kind of nitrogen-doped carbon catalyst and its preparation method and application

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preparation example Construction

[0061] A method for preparing a nitrogen-doped carbon catalyst, the method comprising the steps of:

[0062] 1) The triaryl imidazole benzoxazine monomer (TBZ) is placed in a reactor for thermal polymerization to obtain a triaryl imidazole benzoxazine polymer (TPB).

[0063] 2) The triaryl imidazole benzoxazine polymer (TPB) obtained in step 1) is subjected to a Friedel-Crafts reaction in the presence of a catalyst and a crosslinking agent to synthesize a triaryl imidazole benzoxazine crosslinked polymer (Cross -linked TPB).

[0064] 3) The nitrogen-doped carbon catalyst (NDC) is obtained by heat-treating and acid-treating the triarylimidazole-containing benzoxazine cross-linked polymer (Cross-linked TPB) obtained in step 2).

[0065] Preferably, step 1) specifically includes: putting the triaryl imidazole benzoxazine monomer (TBZ) into a reactor (such as a muffle furnace), and then raising the temperature of the reactor to perform the reaction (the reaction temperature is 15...

Embodiment 1

[0071] 1) Synthesis of triaryl imidazole benzoxazine monomer (TBZ):

[0072] Synthesis of compound A (2-{[4-(4,5-diphenyl-1H-imidazol-2-yl)-phenylimino]-methyl}-phenol): Weigh 10g (32mmol) of 4 -(4,5-Diphenyl-1H-imidazol-2-yl)-aniline and 5.52g (48mmol) of salicylaldehyde were dissolved in 300ml of ethanol, and then heated to 100°C under nitrogen atmosphere for reflux reaction for 24h. After the reaction, the system was poured into 1000ml petroleum ether, suction filtered and washed to obtain bright yellow compound A with a yield of 95%.

[0073] Synthesis of compound B (2-{[4-(4,5-diphenyl-1H-imidazol-2-yl)-phenylamino]-methyl}-phenol): add 1.67 g (43.2mmol) sodium borohydride, 9g (21.6mmol) compound A and 100ml dry tetrahydrofuran were stirred at room temperature for 12h. After the reaction, slowly add 70ml of water, continue to stir for 12h, then pour the system into a large amount of cold water, and filter with suction. The obtained product was first dried under vacuum ...

Embodiment 2

[0082] 1) Synthesis of triaryl imidazole benzoxazine monomer (TBZ):

[0083] Synthesis of compound A (2-{[4-(4,5-diphenyl-1H-imidazol-2-yl)-phenylimino]-methyl}-phenol): Weigh 10g (32mmol) of 4 -(4,5-Diphenyl-1H-imidazol-2-yl)-aniline and 5.52g (48mmol) of salicylaldehyde were dissolved in 300ml of ethanol, and then heated to 100°C under nitrogen atmosphere for reflux reaction for 24h. After the reaction, the system was poured into 1000ml petroleum ether, suction filtered and washed to obtain bright yellow compound A with a yield of 95%.

[0084] Synthesis of compound B (2-{[4-(4,5-diphenyl-1H-imidazol-2-yl)-phenylamino]-methyl}-phenol): add 1.67 g (43.2mmol) sodium borohydride, 9g (21.6mmol) compound A and 100ml dry tetrahydrofuran were stirred at room temperature for 12h. After the reaction, slowly add 70ml of water, continue to stir for 12h, then pour the system into a large amount of cold water, and filter with suction. The obtained product was first dried under vacuum ...

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Abstract

The invention discloses a nitrogen-doped carbon catalyst, which is prepared by the following preparation method: firstly, a triaryl imidazole benzoxazine monomer (TBZ) is used for thermal polymerization reaction to obtain a triaryl imidazole benzoxazine-containing polymerization substance (TPB). Then, the triaryl imidazole benzoxazine polymer (TPB) was subjected to Friedel-Crafts reaction in the presence of a catalyst and a crosslinking agent to synthesize a triaryl imidazole benzoxazine crosslinked polymer (Cross-linked TPB). Finally, the nitrogen-doped carbon catalyst (NDC) was obtained by heat-treating and acid-treating the triarylimidazole-benzoxazine-containing cross-linked polymer (Cross‑linked TPB). The nitrogen-doped carbon-based (NDC) catalyst has a high specific area and rich pore structure, and exhibits excellent catalytic performance for oxygen reduction (ORR) in the application of zinc-air batteries.

Description

technical field [0001] The invention relates to an electrocatalyst, in particular to a nitrogen-doped carbon catalyst and its preparation method and application, and belongs to the field of oxygen reduction 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 1350Wh kg -1 , 6 times that of lithium-air batteries, and at the same time, zinc-air batteries have a longer shelf life than traditional batteries. However, the slow oxygen reduction (ORR) kinetics of cathode materials for Zn-ai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M12/06H01M12/08B01J27/24C08G73/06
CPCB01J27/24B01J35/0033C08G73/0677H01M4/96H01M12/06H01M12/08
Inventor 黎华明李叙锋陈红飙
Owner XIANGTAN UNIV
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