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Porous nitrogen-doped carbon sphere material with ultralow cobalt atom content as well as preparation method and application of porous nitrogen-doped carbon sphere material

A nitrogen-doped carbon, ultra-low cobalt technology, applied in chemical instruments and methods, catalyst activation/preparation, electrical components, etc., can solve the problems of low cobalt atom content, high specific surface area and pore structure, etc., and achieve oxygen reduction performance. Excellent effect, improved electrochemical activity, simple preparation method

Pending Publication Date: 2021-02-26
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the application of porous carbon materials in the field of oxygen reduction catalytic reaction, to provide a porous nitrogen-doped carbon sphere material with ultra-low cobalt atom content, its preparation method and its application. The porous nitrogen-doped carbon sphere material of the present invention Carbon spheres have extremely low cobalt atom content and high specific surface and pore structure, which can be applied to oxygen reduction reaction

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  • Porous nitrogen-doped carbon sphere material with ultralow cobalt atom content as well as preparation method and application of porous nitrogen-doped carbon sphere material
  • Porous nitrogen-doped carbon sphere material with ultralow cobalt atom content as well as preparation method and application of porous nitrogen-doped carbon sphere material
  • Porous nitrogen-doped carbon sphere material with ultralow cobalt atom content as well as preparation method and application of porous nitrogen-doped carbon sphere material

Examples

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Embodiment 1

[0050] In this example, see Figure 8 , a porous nitrogen-doped carbon sphere material with ultra-low cobalt atom content, using EDTA disodium cobalt salt as the cobalt source, dopamine hydrochloride as the nitrogen source, in an alkaline environment, through polymer encapsulation and In the high-temperature pyrolysis process, dopamine is used to stir and polymerize to form polydopamine to wrap cobalt atoms, and to form porous carbon spheres after high-temperature pyrolysis, thereby forming a porous nitrogen-doped carbon sphere electrocatalyst with ultra-low cobalt atom content.

[0051] In this example, see Figure 8 , a method for preparing a porous nitrogen-doped carbon sphere material with an ultra-low cobalt atom content in this embodiment, comprising the following steps:

[0052] a. By volume, 2 parts of ammonia water, 36 parts of ethanol and 90 parts of deionized water are placed in a beaker, and fully stirred at a speed of 600 rpm for 30 minutes to obtain a uniform an...

Embodiment 2

[0066] This embodiment is basically the same as Embodiment 1, especially in that:

[0067] In this example, see Figure 8 , a porous nitrogen-doped carbon sphere material with ultra-low cobalt atom content, using EDTA disodium cobalt salt as the cobalt source, dopamine hydrochloride as the nitrogen source, in an alkaline environment, through polymer encapsulation and In the high-temperature pyrolysis process, dopamine is used to stir and polymerize to form polydopamine to wrap cobalt atoms, and to form porous carbon spheres after high-temperature pyrolysis, thereby forming a porous nitrogen-doped carbon sphere electrocatalyst with ultra-low cobalt atom content.

[0068] In this example, see Figure 8 , a method for preparing a porous nitrogen-doped carbon sphere material with an ultra-low cobalt atom content in this embodiment, comprising the following steps:

[0069] a. By volume, 4 parts of ammonia water, 50 parts of ethanol and 150 parts of deionized water are placed in a...

Embodiment 3

[0079] This embodiment is basically the same as Embodiment 1, especially in that:

[0080] In this example, see Figure 8 , a porous nitrogen-doped carbon sphere material with ultra-low cobalt atom content, using EDTA disodium cobalt salt as the cobalt source, dopamine hydrochloride as the nitrogen source, in an alkaline environment, through polymer encapsulation and In the high-temperature pyrolysis process, dopamine is used to stir and polymerize to form polydopamine to wrap cobalt atoms, and to form porous carbon spheres after high-temperature pyrolysis, thereby forming a porous nitrogen-doped carbon sphere electrocatalyst with ultra-low cobalt atom content.

[0081] In this example, see Figure 8 , a method for preparing a porous nitrogen-doped carbon sphere material with an ultra-low cobalt atom content in this embodiment, comprising the following steps:

[0082] a. By volume, 2 parts of ammonia water, 36 parts of ethanol and 90 parts of deionized water are placed in a ...

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Abstract

The invention discloses a porous nitrogen-doped carbon sphere material with an ultralow cobalt atom content as well as a preparation method and application of the porous nitrogen-doped carbon sphere material. According to the preparation method, ethylenediamine tetraacetic acid disodium cobalt salt which is simple and easy to obtain is selected as a cobalt source, dopamine hydrochloride is selected as a nitrogen source, and a porous nitrogen-doped carbon sphere with an ultralow cobalt atom content is obtained through polymer encapsulation and pyrolysis. The porous nitrogen-doped carbon spheresynthesized by the method has a high specific surface area and considerable defect states, which is beneficial for a surface oxygen reduction catalytic reaction, so the catalytic activity of an electrocatalyst is effectively enhanced. The obtained material shows excellent oxygen reduction activity, has good cycling stability and certain methanol toxicity resistance, can generate huge economic benefits and social benefits, and has wide application prospects.

Description

technical field [0001] The invention relates to the field of porous carbon material preparation and electrochemical catalysis, and specifically refers to a nitrogen-doped carbon sphere electrocatalyst and its preparation method and application. Background technique [0002] Oxygen reduction reaction is a key process in energy storage and conversion of devices such as fuel cells and metal-air batteries. However, the multi-step proton-coupled electron transfer reaction pathway in the oxygen reduction process is very complicated, so suitable electrocatalysts can further accelerate its kinetics. So far, a series of noble metal catalysts such as platinum, palladium, iridium and ruthenium and their alloys have been proven to accelerate the oxygen reduction reaction, but such catalysts are expensive, have little reserves and poor durability, and cannot be applied on a large scale. [0003] Carbon-based materials, an ancient and young material, are considered to be one of the promi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/08B01J35/10B01J37/08H01M4/90
CPCB01J27/24B01J37/084H01M4/9083H01M4/9041B01J35/33B01J35/60B01J35/51B01J35/615B01J35/617Y02E60/50
Inventor 王亮乐梦颖郭华章陈佳
Owner SHANGHAI UNIV
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