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Graphene/nickel-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application

A technology of oxygen catalyst and hydrotalcite, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., to achieve low preparation cost, good OER and ORR activity, easy to purchase and the effect of preparation

Inactive Publication Date: 2017-11-17
杭州新灵峰润滑油有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the preparation of spherical porous rGO / 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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  • Graphene/nickel-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application
  • Graphene/nickel-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application
  • Graphene/nickel-iron hydrotalcite bifunctional oxygen catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (a) Preparation of GO / LDH complex

[0033] 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 the unstripped GO to obtain the 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 180°C for 24h, centrifuge the reaction solution, and wash it with deionized water and ethanol respectively Three times, the GO / LDH complex is obtained after drying;

[0034] (b) Preparation of rGO / LDH oxygen catalyst

[0035] ...

Embodiment 2

[0037] (a) Preparation of GO / LDH complex

[0038] Disperse a certain amount of GO in ethylene glycol to make the concentration 0.5mg / 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 180°C for 24h, centrifuge the reaction solution, and wash it with deionized water and ethanol respectively Three times, the GO / LDH complex is obtained after drying;

[0039] (b) Preparation of rGO / LDH oxygen catalyst

[0040] Prepar...

Embodiment 3

[0042] (a) Preparation of GO / LDH complex

[0043] 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 the unstripped GO to obtain the 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 dissolve it completely, then slowly add 0.2g 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 180°C for 24h, centrifuge the reaction solution, and wash it with deionized water and ethanol respectively Three times, the GO / LDH complex is obtained after drying;

[0044] (b) Preparation of rGO / LDH oxygen catalyst

[0045] Prepa...

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Abstract

The invention relates to a non-metallic bi-functional oxygen catalyst for graphene / nickel iron type hydrotalcite as well as a preparation method and electric catalytic application thereof to oxygen evolution reaction and oxygen reduction reaction in an alkaline medium. The catalyst takes a micelle as a template, and under the hydrothermal and reducing conditions, the nickel iron type hydrotalcite is assembled onto graphene in sequence to form a spherical porous graphene oxide / nickel iron type hydrotalcite compound. The method comprises the following steps: dispersing graphene oxide and metal salt in the micelle, introducing an alkali source, synthesizing the graphene oxide / nickel iron type hydrotalcite compound under the hydrothermal conditions, and performing hydrazine hydrate reduction on an obtained product to obtain the catalyst. The catalyst prepared by the method has high oxygen evolution and oxygen reduction catalytic activity, good stability and excellent methanol tolerance under the alkaline conditions and is low in cost of raw materials used, simple in preparation method, easy to operate and convenient 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 graphene / nickel-iron hydrotalcite bifunctional oxygen catalyst; it also relates to a preparation method of the catalyst and its anode oxygen evolution reaction in alkaline electrolyzed water and a fuel cell Electrocatalytic applications in cathodic 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, especially oxygen catalysts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J23/745B01J21/18H01M4/90H01M4/88C25B11/06
CPCB01J21/18B01J23/745B01J23/755C25B11/061H01M4/8825H01M4/9016H01M4/9083Y02E60/50
Inventor 詹天荣田夏王志伟张御妹
Owner 杭州新灵峰润滑油有限公司
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