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A cobalt nitride embedded porous nitrogen-doped graphene material and its preparation method and application

A nitrogen-doped graphene and cobalt nitride technology, applied in the field of electrochemistry, can solve the problems of high cost, limited reserves of precious metal-based catalysts, poor stability, etc.

Active Publication Date: 2021-03-16
山东大学深圳研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as far as the inventors of the present disclosure know, such noble metal-based catalysts have limited reserves, high cost, poor stability, and generally cannot be used as multifunctional electrocatalysts for ORR, HER, and OER at the same time.

Method used

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  • A cobalt nitride embedded porous nitrogen-doped graphene material and its preparation method and application
  • A cobalt nitride embedded porous nitrogen-doped graphene material and its preparation method and application
  • A cobalt nitride embedded porous nitrogen-doped graphene material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0055] 40mL of GO dispersion (1.5mg mL -1 ) sonicated for 20 minutes, then 2 mmol (0.4982 g) of Co(OAc) was added under vigorous stirring 2 4H 2 O. Subsequently, tannic acid (0.75 g) was dissolved in 10 mL of deionized water and added to the above mixed solution. The resulting suspension was centrifuged, washed with water, flash-frozen with liquid nitrogen and then dried for 12 hours. The obtained samples were loaded into a tube furnace and heated under N 2 : NH 3 In an atmosphere with a ratio of 3:1, it was heated to 650°C at a heating rate of 10°C / min, and pyrolyzed for 1 hour to obtain a sample, which was denoted as Co 5.47 N@N-rGO-650.

Embodiment 2

[0057] 40mL of GO dispersion (1.5mg mL -1 ) sonicated for 20 minutes, then 2 mmol (0.4982 g) of Co(OAc) was added under vigorous stirring 2 4H 2 O. Subsequently, tannic acid (0.75 g) was dissolved in 10 mL of deionized water and added to the above mixed solution. The resulting suspension was centrifuged, washed with water, flash-frozen with liquid nitrogen and then dried for 12 hours. The obtained samples were loaded into a tube furnace and heated under N 2 : NH 3 In an atmosphere with a ratio of 3:1, it was heated to 700°C at a heating rate of 10°C / min, and pyrolyzed for 1 hour to obtain a sample, which was denoted as Co 5.47 N@N-rGO-700.

Embodiment 3

[0059] 40mL of GO dispersion (1.5mg mL -1 ) sonicated for 20 minutes, then added 0.4982 g Co(OAc) under vigorous stirring 2 4H 2 O. Subsequently, tannic acid (0.75 g) was dissolved in 10 mL of deionized water and added to the above mixed solution. The resulting suspension was centrifuged, washed with water, flash-frozen with liquid nitrogen and then dried for 12 hours. The obtained samples were loaded into a tube furnace and heated under N 2 : NH 3 In an atmosphere with a ratio of 3:1, it was heated to 750°C at a heating rate of 10°C / min, and pyrolyzed for 1 hour to obtain a sample, which was denoted as Co 5.47 N@N-rGO-750.

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Abstract

The present invention provides a cobalt nitride embedded porous nitrogen-doped graphene material, and a preparation method and an application thereof. The cobalt nitride embedded porous nitrogen-dopedgraphene material comprises nitrogen-doped graphene and Co5.47N nanoparticles, the surface of the nitrogen-doped graphene has a vermiform porous structure, and the Co5.47N nanoparticles are embeddedat the end of the vermiform porous structure. The preparation method comprises the following steps: sequentially adding cobalt acetate and tannic acid to a graphene oxide dispersion, performing mixinguntil uniformity to obtain a suspension, separating out solid materials from the suspension, and heating the obtained solution to a temperature of 60 DEG C or more in a nitrogen and ammonia mixed atmosphere in order to carry out pyrolysis. The material provided by the invention exhibits effective multifunctional catalytic activity for ORR, HER and OER in an alkaline solution.

Description

technical field [0001] The disclosure belongs to the field of electrochemistry and relates to electrocatalysts, in particular to a cobalt nitride embedded porous nitrogen-doped graphene material, a preparation method and application thereof. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The massive consumption of traditional fossil fuels has led to serious climate and environmental issues, which has drawn attention to the development of clean and efficient electrochemical energy conversion and storage technologies, such as fuel cells, metal-air batteries, and water electrolysis devices, etc. The performance of these energy storage and conversion devices is determined by several fundamental electrochemical reactions. For example, rechargeable Zn-air batteries have attracted increasing attention due to their low cost, environmental friendliness,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B21/06B82Y30/00H01M4/86H01M4/90
CPCB82Y30/00C01B21/0622C01P2004/80C01B32/184H01M4/8652H01M4/90Y02E60/50
Inventor 张进涛舒欣欣马继臻
Owner 山东大学深圳研究院
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