Preparation method of CoN3@N-C composite electrocatalyst

A technology of electrocatalyst and preparation process, applied in catalyst activation/preparation, carbon preparation/purification, chemical instruments and methods, etc., to achieve the effect of high specific surface area, good acidic ORR and alkaline ORR performance

Active Publication Date: 2019-01-04
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metals are generally good electrocatalysts, however, the stability, scarcity, and high cost of these rare metal-based electrocatalysts are major obstacles to the large-scale implementation of this technology, thus, there is an urgent need to develop efficient, durable, and low-cost alternatives

Method used

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  • Preparation method of CoN3@N-C composite electrocatalyst
  • Preparation method of CoN3@N-C composite electrocatalyst
  • Preparation method of CoN3@N-C composite electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh 9.850g of dimethylimidazole into a beaker, add 100ml of absolute methanol and 100ml of absolute ethanol, stir until the dimethylimidazole is dissolved and evenly dispersed in the solution.

[0020] (2) Weigh 0.611g Co(NO 3 ) 2 ·6H 2 O and 8.118g Zn(NO 3 ) 2 ·6H 2 O in the beaker, ie Co(NO 3 ) 2 ·6H 2 O and 8.118g Zn(NO 3 ) 2 ·6H 2 The mass ratio of O is 7:93, add 100ml of absolute methanol and 100ml of absolute ethanol, stir until the solid dissolves and disperses evenly.

[0021] (3) Mix the solutions of step (1) and step (2), and stir quickly until the mixture is uniform, then seal with a parafilm, settle at room temperature for 20 hours, and then filter and wash the solution in the beaker , drying the obtained purple solid for 12 hours to obtain the Zn-Co-ZIF metal-organic framework material.

[0022] (4) Transfer the purple solid obtained in step (3) to a tubular atmosphere furnace for carbonization at 1000°C under an argon atmosphere, with a h...

Embodiment 2

[0025](1) Weigh 9.850g of dimethylimidazole into a beaker, add 100ml of absolute methanol and 100ml of absolute ethanol, stir until the dimethylimidazole is dissolved and evenly dispersed in the solution.

[0026] (2) Weigh 0.436g Co(NO 3 ) 2 ·6H 2 O and 8.293g Zn(NO 3 ) 2 ·6H 2 O in the beaker, ie Co(NO 3 ) 2 ·6H 2 O and 8.118g Zn(NO 3 ) 2 ·6H 2 The mass ratio of O is 5:95, add 100ml of absolute methanol and 100ml of absolute ethanol, stir until the solid dissolves and disperses evenly.

[0027] (3) Mix the solutions of step (1) and step (2), and stir quickly until the mixture is uniform, then seal with a parafilm, settle at room temperature for 20 hours, and then filter and wash the solution in the beaker , drying the obtained purple solid for 12 hours to obtain the Zn-Co-ZIF metal-organic framework material.

[0028] (4) Transfer the purple solid obtained in step (3) to a tubular atmosphere furnace and carry out carbonization at 1000°C, 1050°C, and 1100°C under ...

Embodiment 3

[0031] (1) Weigh 9.850g of dimethylimidazole into a beaker, add 100ml of absolute methanol and 100ml of absolute ethanol, stir until the dimethylimidazole is dissolved and evenly dispersed in the solution.

[0032] (2) Weigh 0.611g Co(NO 3 ) 2 ·6H 2 O and 8.118g Zn(NO 3 ) 2 ·6H 2 O in the beaker, ie Co(NO 3 ) 2 ·6H 2 O and 8.118g Zn(NO 3 ) 2 ·6H 2 The mass ratio of O is 7:93, add 100ml of absolute methanol and 100ml of absolute ethanol, stir until the solid dissolves and disperses evenly.

[0033] (3) Mix the solutions of step (1) and step (2), and stir quickly until the mixture is uniform, then seal with a parafilm, settle at room temperature for 20 hours, and then filter and wash the solution in the beaker , drying the obtained purple solid for 12 hours to obtain the Zn-Co-ZIF metal-organic framework material.

[0034] (4) Transfer the purple solid obtained in step (3) to a tubular atmosphere furnace for carbonization at 1000°C under an argon atmosphere, with a h...

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Abstract

The invention relates to a preparation method of a CoN3@nitrogen doped carbon (CoN3@N-C) composite electrocatalyst. The method comprises the steps that an efficient electrocatalyst is developed in anelectrochemical device, that is to say, a Zn-Co-ZIF metal-organic framework material is prepared first, then high-temperature carbonization is conducted in an atmosphere of argon, and the CoN3@N-C composite electrocatalyst is obtained. The composite electrocatalyst is of a dodecahedron structure and has a large specific surface area, and meanwhile due to the existence of CoN3 matter, the compositeelectrocatalyst has rich active sites, and therefore the half-wave potential and current density performance of the CoN3@N-C composite electrocatalyst in acidic and basic ORR performance tests is good. The preparation process is simple and easy to operate, the price of needed raw materials is low, the price of operation equipment is not expensive, the quality and performance of an obtained product are good, and the product has a bright prospect in application of electrochemical catalysts. Accordingly, the performance of the CoN3@N-C composite electrocatalyst in an electrochemical catalytic reaction is excellent, and the CoN3@N-C composite electrocatalyst is a catalyst material with a very good prospect.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst materials, and relates to a CoN 3 Preparation technology of @N-C composite electrocatalysts, specifically involving Zn-Co-ZIF metal-organic frameworks and CoN 3 Preparation method of @N-C composite electrocatalyst. Background technique [0002] In recent years, electrochemistry has been involved in the ORR reaction, which is an important reaction in electrochemical catalysis, and a highly active and stable electrocatalyst applied to the ORR reaction is crucial. Noble metals are usually good electrocatalysts, however, the stability, scarcity, and high cost of these rare metal-based electrocatalysts are the main obstacles to the large-scale implementation of this technology, thus, there is an urgent need to develop efficient, durable, and low-cost alternatives. In the past few years, metal-organic frameworks have emerged as a new platform for the synthesis of electrocatalysts. As a subcla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01B32/05B01J27/24B01J35/00B01J37/08C08G83/00
CPCC01B21/0622C01B32/05C08G83/008B01J27/24B01J35/0033B01J37/086C01P2002/72C01P2004/03C01P2006/40
Inventor 杨东江邹译慧赵小亮孙瑾
Owner QINGDAO UNIV
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