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Nitrogen-doped graphene/cobalt-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application

A nitrogen-doped graphene, oxygen catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of low price, good catalytic activity, and abundant resources

Active Publication Date: 2018-01-19
JIANGSU SANJI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of NG / LDH high-efficiency composite catalyst by this method, and the application of this catalyst in alkaline electrolysis water anode OER and fuel cell cathode ORR.

Method used

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  • Nitrogen-doped graphene/cobalt-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application
  • Nitrogen-doped graphene/cobalt-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application
  • Nitrogen-doped graphene/cobalt-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (a) Preparation of CoFe-LDO hybrid

[0035] Dissolve cobalt chloride hexahydrate and ferric chloride hexahydrate in ultrapure water at a certain molar ratio, so that the total concentration of metal ions is 0.215mol / L, stir to dissolve completely, and then drop in 1.5mol / L NaOH at a constant speed, Until the pH=8, the mixed solution was transferred into a reaction kettle and reacted at 130°C for 24 hours. After the reaction solution was centrifuged, washed three times with deionized water and ethanol respectively, dried and ground, and calcined at 500°C for 5 hours in an air atmosphere, the obtained product That is CoFe-LDO hybrid;

[0036] (b) Preparation of GO / LDH complex

[0037] Disperse a certain amount of GO in ultrapure water, ultrasonically disperse for 4 hours, and centrifuge at 5000rpm for 10min to remove unstripped GO, so that the final concentration is 1.0mg / mL, pipette 50mL of the solution, and slowly add 50mg of the step ( The CoFe-LDO hybrid obtained in...

Embodiment 2

[0041] (a) Preparation of CoFe-LDO hybrid

[0042] Prepared according to the method and conditions of step (a) in Example 1;

[0043] (b) Preparation of GO / LDH complex

[0044] Disperse a certain amount of GO in ultrapure water, ultrasonically disperse for 4 hours, and centrifuge at 5000rpm for 10min to remove unstripped GO, so that the final concentration is 3.0mg / mL, pipette 50mL of the solution, and slowly add 50mg of the step ( The CoFe-LDO hybrid obtained in a) was stirred at room temperature for 12 hours, and then centrifuged at 3000rpm for 10 minutes, and the resulting precipitate was the GO / LDH complex;

[0045] (c) Preparation of NG / LDH oxygen catalyst

[0046] Prepared according to the method and conditions of step (c) in Example 1, its average particle diameter is 136nm, and the specific surface area is 142.38m 2 / g.

Embodiment 3

[0048] (a) Preparation of CoFe-LDO hybrid

[0049] Prepared according to the method and conditions of step (a) in Example 1;

[0050] (b) Preparation of GO / LDH complex

[0051] Disperse a certain amount of GO in ultrapure water, ultrasonically disperse for 4 hours, and centrifuge at 5000rpm for 10min to remove unstripped GO, so that the final concentration is 6.0mg / mL, pipette 50mL of the solution, and slowly add 50mg of the step ( The CoFe-LDO hybrid obtained in a) was stirred at room temperature for 12 hours, and then centrifuged at 3000rpm for 10 minutes, and the resulting precipitate was the GO / LDH complex;

[0052] (c) Preparation of NG / LDH oxygen catalyst

[0053] Prepared according to the method and conditions of step (c) in Example 1, its average particle diameter is 125nm, and the specific surface area is 168.63m 2 / g.

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Abstract

The invention discloses a nitrogen-doped graphene / ferrocobalt hydrotalcite-like compound non-precious metal difunctional oxygen-reduction catalyst and a preparing method and application thereof. A bimetallic oxide is used as a precursor, the memory effect of a hydrotalcite-like compound is utilized, oxidized graphene and the ferrocobalt hydrotalcite-like compound are assembled, and then the compound is doped with carbon nitride nanosheets under the reduction condition to obtain a nitrogen-doped graphene / ferrocobalt hydrotalcite-like compound composition. The oxygen-reduction catalyst has high catalytic activity to oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) at the same time under the alkaline condition and has high stability and excellent methyl alcohol tolerance, the cost of adopted raw materials is low, the preparing method is simple, operation is easy, and large-scale production can be achieved conveniently.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a nitrogen-doped graphene / cobalt-iron hydrotalcite 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, especial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88B01J27/24B82Y30/00B82Y40/00
CPCB01J27/24B82Y30/00B82Y40/00H01M4/8825H01M4/9016H01M4/9091Y02E60/50
Inventor 詹天荣张御妹谭正伟
Owner JIANGSU SANJI IND
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