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Nitrogen-cobalt double-doped porous carbon composite bifunctional oxygen catalyst and its preparation method and application

An oxygen catalyst and composite technology, which is applied in structural parts, electrolysis components, electrolysis processes, etc., to achieve the effects of easy operation, excellent activity and simple preparation method

Active Publication Date: 2019-01-11
江苏世丰企业管理咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature review, there is no report on the preparation of cobalt-nitrogen double-doped porous carbon composites as bifunctional oxygen catalysts using marine polysaccharide sodium alginate (SA) as a carbon source.

Method used

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  • Nitrogen-cobalt double-doped porous carbon composite bifunctional oxygen catalyst and its preparation method and application
  • Nitrogen-cobalt double-doped porous carbon composite bifunctional oxygen catalyst and its preparation method and application
  • Nitrogen-cobalt double-doped porous carbon composite bifunctional oxygen catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (a) Preparation of melamine / Co-SA composite

[0033]Disperse a certain amount of SA in 200mL deionized water, heat and stir at 80°C for 8h to dissolve completely, and prepare a SA solution with a concentration of 5mg / mL; add cobalt chloride hexahydrate into deionized water, and prepare a cobalt ion concentration of 0.02mol / L 150mL of the solution was slowly added dropwise to the SA solution during stirring, centrifuged at 4000rpm for 10min after stirring for 4h, the collected precipitate was redispersed in 200mL of deionized water, then 5g of melamine was added, heated to 80°C and stirred for 1h, the The above mixed solution was transferred into a reaction kettle, subjected to hydrothermal reaction at 120-150°C for 8 hours, the reaction solution was centrifuged and washed three times with deionized water and ethanol in sequence, and dried to obtain a melamine / Co-SA composite;

[0034] (b) Preparation of Co / NPC bifunctional oxygen catalyst

[0035] Grind the melamine / Co...

Embodiment 2

[0037] (a) Preparation of melamine / Co-SA composite

[0038] Disperse a certain amount of SA in 200mL deionized water, heat and stir at 80°C for 8h to dissolve completely, and prepare a SA solution with a concentration of 10mg / mL; add cobalt chloride hexahydrate into deionized water, and prepare a cobalt ion concentration of 0.02mol / L 150mL of the solution was slowly added dropwise to the SA solution during stirring, centrifuged at 4000rpm for 10min after stirring for 4h, the collected precipitate was redispersed in 200mL of deionized water, then 5g of melamine was added, heated to 80°C and stirred for 1h, the The above mixed solution was transferred into a reaction kettle, subjected to hydrothermal reaction at 120-150°C for 8 hours, the reaction solution was centrifuged and washed three times with deionized water and ethanol in sequence, and dried to obtain a melamine / Co-SA composite;

[0039] (b) Preparation of Co / NPC bifunctional oxygen catalyst

[0040] Prepare according t...

Embodiment 3

[0043] (a) Preparation of melamine / Co-SA composite

[0044] Prepare according to the method and conditions of step (a) in Example 2.

[0045] (b) Preparation of Co / NPC bifunctional oxygen catalyst

[0046] Grind the melamine / Co-SA composite obtained in step (a) into powder, put a certain amount in a porcelain boat in a tube furnace, heat at a rate of 5°C / min under a nitrogen atmosphere, and first raise to Heating at 200°C for 1 hour, then heating to 700°C for 4 hours to obtain the Co / NPC bifunctional oxygen catalyst with an average pore diameter of 2.2-6.8nm and a specific surface area of ​​168.84m 2 / g.

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Abstract

The invention discloses a nitrogen and cobalt double-doped porous carbon composite bifunctional oxygen catalyst and a preparation method and application thereof. The preparation method comprises the steps that firstly, under a hydrothermal condition, divalent cobalt ions, melamine and sodium alginate are compounded to obtain melamine / cobalt ion-sodium alginate; and secondly, high-temperature calcination is performed, and then the nitrogen-cobalt double-doped porous carbon bifunctional oxygen catalyst is prepared. The catalyst is made of a porous material, the average hole diameter of the catalyst is 2 nm-8 nm, and the specific area is 148.23 m<2> / g-188.27 m<2> / g. According to the catalyst, cobalt exists in the forms of the Co elementary substance, CoO and Co3O4; and nitrogen atoms doped inthe porous carbon material exist in the forms of pyrrole and pyridine. Due to double doping of the cobalt and nitrogen, the catalyst has high oxygen evolution and oxygen reduction catalytic activity,good stability and excellent methyl alcohol tolerance at the same timeunder alkaline conditions, used raw materials are low in cost, the preparation method is simple, operation is easy, and large-scale production is convenient.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a nitrogen-cobalt double-doped porous carbon composite bifunctional oxygen catalyst; it also relates to a preparation method of the catalyst and its oxygen evolution reaction and fuel in alkaline electrolyzed water anode Electrocatalytic applications in battery cathode oxygen reduction reactions. Background technique: [0002] With the increasing demand for clean and sustainable energy, scientists have devoted a lot of energy to the research and development of efficient, low-cost and environmentally friendly energy conversion and storage systems. Among them, the oxygen reduction reaction (ORR) is a ubiquitous cathodic reaction in fuel cells and metal-air batteries, and the oxygen evolution reaction (OER) plays an important role in solar fuel synthesis and water splitting energy storage systems. Therefore, catalysts, especial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06H01M4/86H01M4/90H01M4/88
CPCY02E60/36Y02E60/50
Inventor 詹天荣丁桂艳刘晓林
Owner 江苏世丰企业管理咨询有限公司
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