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Nitrogen-doped graphene/nickel-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 preparation cost, low price, and abundant resources

Active Publication Date: 2017-12-15
湛江市菱霸润滑油有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of spherical porous NG / LDH catalysts by this method, and the application of this catalyst in alkaline electrolysis water anode OER and fuel cell cathode ORR have not been reported yet.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (a) Preparation of GO / LDH complex

[0035] Disperse a certain amount of GO in ethylene glycol to make the concentration 1.0mg / mL, ultrasonically disperse for 1 hour, and centrifuge at 3000rpm for 10min to remove unstripped GO to obtain a stripped GO dispersion. Take 20mL of the dispersion and press 3: Add nickel chloride hexahydrate and ferric chloride hexahydrate to it at a molar ratio of 1, so that the total concentration of metal ions is 0.04mol / L, stir to make it dissolve completely, then slowly add 0.6g sodium dodecylsulfonate, stir Make it completely dissolved under certain conditions, then drop into 10mL ethylene glycol solution containing 0.16g NaOH at a constant speed, transfer the mixed solution into the reaction kettle, react at 160°C for 24h, centrifuge the reaction solution, and wash with deionized water and ethanol respectively Three times, the GO / LDH complex is obtained after drying;

[0036] (b)C 3 N 4 Preparation of nanosheets

[0037] Calcining 0.5...

Embodiment 2

[0041] (a) Preparation of GO / LDH complex

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

[0043] (b)C 3 N 4 Preparation of nanosheets

[0044] Prepared according to the method and conditions of step (b) in Example 1;

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

[0046] Disperse the GO / LDH complex obtained in step (a) in an aqueous solution to a concentration of 2 mg / ml, pipette 50 ml of the solution, and add 30 mL of 0.75 mg / mL of C 3 N 4 The aqueous solution of nanosheets was mixed and moved to the reaction kettle, and reacted at 180°C for 20 hours. The obtained solid sample was centrifuged, washed with deionized water and ethanol three times, and dried to obtain the bifunctional oxygen catalyst NG / LDH. Its average particle size is 296nm and its specific surface area is 186.51m 2 / g.

Embodiment 3

[0048] (a) Preparation of GO / LDH complex

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

[0050] (b)C 3 N 4 Preparation of nanosheets

[0051] Prepared according to the method and conditions of step (b) in Example 1;

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

[0053] Disperse the GO / LDH complex obtained in step (a) in an aqueous solution to a concentration of 2mg / ml, pipette 50ml of the solution, and add 30mL of 0.50mg / mL of C 3 N 4 The aqueous solution of nanosheets was mixed and moved to the reaction kettle, and reacted at 180°C for 20 hours. The obtained solid sample was centrifuged, washed with deionized water and ethanol three times, and dried to obtain the bifunctional oxygen catalyst NG / LDH. Its average particle size is 318nm and its specific surface area is 208.63m 2 / g.

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Abstract

The invention relates to a nitrogen-doped graphene-ferronickel hydrotalcite non-noble metal difunctional oxygen catalyst and a preparation method thereof and electrocatalysis application of the oxygen catalyst in an alkaline medium to an oxygen evolution reaction and an oxygen reduction reaction. According to the catalyst, a micelle is taken as a template, ferronickel hydrotalcite is assembled on graphene oxide under the hydrothermal condition to form a spherical porous compound, the graphene oxide is reduced and doped with a nitrogen carbide nanosheet simultaneously under the hydrothermal condition, and then the nitrogen-doped graphene-ferronickel hydrotalcite oxygen catalyst is obtained. The method comprises the steps that the graphene oxide and metal salt are firstly dispersed into the micelle, the graphene oxide-ferronickel hydrotalcite compound is obtained through hydro-thermal synthesis under the alkaline condition, the product is doped with the nitrogen carbide nanosheet under the hydrothermal condition, and then the oxygen catalyst is obtained. The oxygen catalyst has the catalytic activity both on oxygen evolution and oxygen reduction under the alkaline condition and is high in stability and methyl alcohol tolerance, low in used raw material cost, simple in preparation method and convenient for 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 nitrogen-doped graphene / nickel-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): H01M4/90H01M4/88B01J27/24
CPCB01J27/24H01M4/8825H01M4/9016H01M4/9083Y02E60/50
Inventor 詹天荣丁桂艳张晓张御妹
Owner 湛江市菱霸润滑油有限公司
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