Metal-free carbon-based electrocatalyst, preparation method and applications thereof

A metal-free and catalyst-free technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy aggregation of metal nanoparticles and low density of catalytic active sites, and achieve simple preparation process , low raw material prices, and the effect of improving electrocatalytic activity

Active Publication Date: 2020-04-14
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that metal nanoparticles are easy to agglomerate and the density of catalytic active sites is low in the pyrolysis process of transition metal materials, the present invention provides a metal-free carbon-based electrocatalyst and its preparation method and application

Method used

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  • Metal-free carbon-based electrocatalyst, preparation method and applications thereof
  • Metal-free carbon-based electrocatalyst, preparation method and applications thereof
  • Metal-free carbon-based electrocatalyst, preparation method and applications thereof

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Embodiment 1

[0040] This embodiment provides a method for preparing a metal-free carbon-based electrocatalyst, which is obtained through the following preparation steps:

[0041] Preparation of ZN-50 precursor: Zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) (5mmol) is dissolved in the DMF solution of 50mL, and benzimidazole (5mmol) and adenine (5mmol) are dissolved in the methanol solution of 100mL, in the process of stirring, will contain Zn(NO 3 ) 2 The DMF solution was quickly added to the methanol solution containing benzimidazole and adenine. After reacting at room temperature for 6 h, the precipitate was collected by centrifugation and dried under vacuum at 60°C to obtain a white powder.

[0042] Preparation of C-ZN-50 electrocatalyst: put the ZN-50 prepared in step (1) into the center of the tube furnace, under a nitrogen atmosphere, raise the temperature to 200°C at a rate of 2°C / min and keep it for 2 hours. Then the temperature was raised to 950° C. at a rate of 3° C. / min and k...

Embodiment 2

[0044] This embodiment provides a method for preparing a metal-free carbon-based electrocatalyst, which is obtained through the following preparation steps:

[0045] (1) Preparation of ZN-50 precursor: Zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) (5mmol) is dissolved in the DMF solution of 50mL, and benzimidazole (5mmol) and adenine (4mmol) are dissolved in the methanol solution of 100mL, in the process of stirring, will contain Zn(NO 3 ) 2 The DMF solution was quickly added to the methanol solution containing benzimidazole and adenine. After reacting at room temperature for 6 h, the precipitate was collected by centrifugation and dried under vacuum at 60°C to obtain a white powder.

[0046] (2) Preparation of C-ZN-50 electrocatalyst: put the ZN-50 prepared in step (1) into the center of the tube furnace, raise the temperature to 200°C at a rate of 2°C / min under a nitrogen atmosphere, and keep After 2 hours, the temperature was raised to 950° C. at a rate of 3° C. / min a...

Embodiment 3

[0048] This embodiment provides a method for preparing a metal-free carbon-based electrocatalyst, which is obtained through the following preparation steps:

[0049] (1) Preparation of ZN-50 precursor: Zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) (5mmol) is dissolved in the DMF solution of 50mL, and benzimidazole (5mmol) and adenine (4.5mmol) are dissolved in the methanol solution of 100mL, in the process of stirring, will contain Zn(NO 3 ) 2 The DMF solution was quickly added to the methanol solution containing benzimidazole and adenine. After reacting at room temperature for 6 hours, the precipitate was collected by centrifugation, and dried in vacuum at 60°C to obtain white powder ZN-50.

[0050] (2) Preparation of C-ZN-50 electrocatalyst: put the ZN-50 prepared in step (1) into the center of the tube furnace, raise the temperature to 200°C at a rate of 2°C / min under a nitrogen atmosphere, and keep After 2 hours, the temperature was raised to 950° C. at a rate of 3° ...

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Abstract

The invention belongs to the field of electrochemistry and new energy, and particularly relates to a metal-free carbon-based electrocatalyst, a preparation method and applications thereof. According to the preparation method, two organic ligands are used as a nitrogen source and a carbon source, a metal organic framework is synthesized through a one-pot reaction at room temperature to serve as a precursor, and the metal-free carbon-based electrocatalytic material is synthesized through high-temperature pyrolysis in an inert atmosphere. According to the invention, the metal-free carbon-based electrocatalyst can be used as an electrocatalyst to be applied to an electrochemical hydrogen evolution reaction, an oxygen evolution reaction and an oxygen reduction reaction, can be applied to air cathodes of rechargeable zinc-air batteries, and has multiple catalytic active sites, wherein the prepared three-functional catalytic material has rich C-Nx active sites, has a layered porous structureand has a synergistic effect with a generated graphitized carbon layer, so that the electrocatalytic activity is improved; and the metal-free electrocatalyst preparation process is simple, low in rawmaterial price and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy, and in particular relates to a metal-free carbon-based electrocatalyst, a preparation method and an application. Background technique [0002] At present, the world's energy consumption is still dominated by mineral energy such as petroleum, coal, and natural gas. While destroying the ecological environment, it is also facing the severe problem of energy depletion. Energy conservation, emission reduction and energy transformation have become the only way for human sustainable development. It is becoming more and more urgent to seek efficient, green, sustainable and safe energy sources. Metal-air batteries are a new generation of green secondary batteries, which have the advantages of low cost, no pollution, high specific power, and high specific energy. They are rich in resources and can be recycled, so they have good development and application prospects. In metal-air batteries, ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00B01J35/10B01J37/08C25B1/04C25B11/06H01M4/90H01M12/08
CPCB01J37/086B01J27/24H01M12/08H01M4/9091C25B1/04C25B11/073B01J35/33B01J35/60Y02E60/10Y02E60/36
Inventor 王俊豪石淼婕张莹张献明
Owner SHANXI UNIV
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