Cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst and preparation method and application thereof

A technology of nitrogen-sulfur co-doping and carbon airgel, which is applied in chemical instruments and methods, physical/chemical process catalysts, electrical components, etc., to achieve the effect of simple preparation method, low price and excellent activity

Active Publication Date: 2017-11-03
东营睿港投资服务有限责任公司
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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 and sulfur co-doped carbon aerogels as bifunctional oxygen catalysts using marine polysaccharide sodium alginate (SA) as a carbon source.

Method used

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  • Cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst and preparation method and application thereof
  • Cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst and preparation method and application thereof
  • Cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst and preparation method and application thereof

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Embodiment 1

[0029] (a) Preparation of dopamine / thiol / Co-SA airgel

[0030]Disperse a certain amount of SA in 200mL deionized water, heat and stir at 80°C for 8h to dissolve completely, and prepare an SA solution with a concentration of 40mg / mL; prepare 2.5g of cobalt chloride hexahydrate into an aqueous solution with a concentration of 0.02mol / L, Slowly add it dropwise to the SA solution during the stirring process, continue stirring for 4 hours, then centrifuge at 4000rpm for 10 minutes, collect the precipitate and redisperse it in 200mL deionized water, add 0.6g dopamine and 40mL mercaptan, stir and dissolve, transfer to the hydrothermal reaction kettle, Hydrothermal reaction at 100°C for 2 hours, the reaction solution was centrifuged and washed, then left to stand to obtain the dopamine / thiol / Co-SA hydrogel, which was frozen at minus 20°C in the refrigerator and then freeze-dried for 36 hours, the dopamine / thiol / Co -SA airgel.

[0031] (b) Preparation of Co / NSPC airgel bifunctional ox...

Embodiment 2

[0034] (a) Preparation of dopamine / thiol / Co-SA airgel

[0035] Disperse a certain amount of SA in 200mL deionized water, heat and stir at 80°C for 8h to dissolve completely, and prepare an SA solution with a concentration of 50mg / mL; prepare 2.5g of cobalt chloride hexahydrate into an aqueous solution with a concentration of 0.02mol / L, Slowly add it dropwise to the SA solution during the stirring process, continue stirring for 4 hours, then centrifuge at 4000rpm for 10 minutes, collect the precipitate and redisperse it in 200mL deionized water, add 0.6g dopamine and 40mL mercaptan, stir and dissolve, transfer to the hydrothermal reaction kettle, Hydrothermal reaction at 100°C for 2 hours, the reaction solution was centrifuged and washed, then left to stand to obtain the dopamine / thiol / Co-SA hydrogel, which was frozen at minus 20°C in the refrigerator and then freeze-dried for 36 hours, the dopamine / thiol / Co -SA airgel.

[0036] (b) Preparation of Co / NSPC airgel bifunctional o...

Embodiment 3

[0040] (a) Preparation of dopamine / thiol / Co-SA airgel

[0041] Disperse a certain amount of SA in 200mL deionized water, heat and stir at 80°C for 8h to dissolve completely, and prepare an SA solution with a concentration of 60mg / mL; prepare 2.5g of cobalt chloride hexahydrate into an aqueous solution with a concentration of 0.02mol / L, Slowly add it dropwise to the SA solution during the stirring process, continue stirring for 4 hours, then centrifuge at 4000rpm for 10 minutes, collect the precipitate and redisperse it in 200mL deionized water, add 0.6g dopamine and 40mL mercaptan, stir and dissolve, transfer to the hydrothermal reaction kettle, Hydrothermal reaction at 100°C for 2 hours, the reaction solution was centrifuged and washed, then left to stand to obtain the dopamine / thiol / Co-SA hydrogel, which was frozen at minus 20°C in the refrigerator and then freeze-dried for 36 hours, the dopamine / thiol / Co -SA airgel.

[0042] (b) Preparation of Co / NSPC airgel bifunctional o...

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Abstract

The invention discloses a cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst and a preparation method and application thereof. The method comprises the following steps: uniformly combining cobalt ions with sodium alginate; performing hydrothermal treatment together with dopamine and mercaptan; centrifuging to obtain dopamine / mercaptan / cobalt-sodium alginate hydrogel; performing high-temperature calcination on the dopamine / mercaptan / cobalt-sodium alginate hydrogel obtained after freeze drying to obtain the cobalt-nitrogen-sulfur co-doped carbon aerogel di-functional oxygen catalyst. The catalyst is an aerogel porous material with an average aperture of 2 to 4 nanometers and a specific surface area of 126.8 to 138.3m<2> / g; cobalt exists in the form of a Co simple substance, CoO and Co3O4; a nitrogen atom doped in a porous carbon material mainly exists in the form of pyrrole and graphite. The cobalt, nitrogen and sulfur are co-doped, so that the catalyst has high oxygen evolution and oxygen reduction catalytic activities at the same time under an alkaline condition; moreover, the catalyst has the advantages of adoption of low-cost raw materials, simple preparation method, easiness in operation and convenience for large-scale production.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a cobalt nitrogen and sulfur co-doped carbon airgel bifunctional oxygen catalyst; it also relates to a preparation method of the catalyst and its oxygen evolution reaction at the anode of alkaline electrolyzed water and Electrocatalytic applications in fuel cell 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, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C25B11/06H01M4/86H01M4/90H01M4/88
CPCB01J27/24B01J35/0013C25B11/04H01M4/8647H01M4/88H01M4/90H01M4/9083Y02E60/50
Inventor 詹天荣王志伟丁桂艳
Owner 东营睿港投资服务有限责任公司
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