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Ionic liquid covalently modified graphene-exfoliated hydrotalcite-like bifunctional oxygen catalyst and its preparation method and application

A technology of covalent modification and ionic liquid, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., to achieve the effects of low preparation cost, good OER and ORR activity, and easy purchase and preparation

Active Publication Date: 2018-02-06
徐州兰岳企业管理服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, ionic liquid covalently modified graphene-exfoliated hydrotalcite-like composites (IL-GR-ELDH) were prepared by the epoxy ring-opening reaction of GO-ELDH composites with amino-functionalized ionic liquids, and the composites were used as oxygen catalysts. , the research on OER and ORR electrocatalysis in alkaline medium has not been reported yet.

Method used

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  • Ionic liquid covalently modified graphene-exfoliated hydrotalcite-like bifunctional oxygen catalyst and its preparation method and application
  • Ionic liquid covalently modified graphene-exfoliated hydrotalcite-like bifunctional oxygen catalyst and its preparation method and application
  • Ionic liquid covalently modified graphene-exfoliated hydrotalcite-like bifunctional oxygen catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (a) Preparation of ELDH nanosheets

[0036] Dissolve nickel chloride hexahydrate and ferric chloride hexahydrate in a molar ratio of 3:1 in 64mL of ultrapure water, so that the total concentration of metal ions is 0.02mol / L, stir to dissolve completely, and then slowly mix 14mL. .2M urea and 2mL0.01M trisodium citrate, the mixed solution was transferred to the reaction kettle, and reacted at 150°C for 24h. After the reaction solution was centrifuged, it was washed three times with deionized water and ethanol respectively, and the obtained CO 3 2- -LDH is dispersed in a mixed aqueous solution of 1mol / L NaCl and 3.3mmol / L HCl, N 2 Stirred under the atmosphere for 12 hours, after suction filtration, Cl - -LDH, and then dispersed in NaNO with a concentration of 0.1mol / L 3 In aqueous solution, N 2 Stir under atmosphere for 12 hours, then dry at room temperature for 12 hours after suction filtration to obtain NO 3 - -LDH, and then a certain amount of NO 3 - -LDH hybri...

Embodiment 2

[0042] (a) Preparation of ELDH nanosheets

[0043] Prepared according to the method and conditions of step (a) in Example 1;

[0044] (b) Preparation of GO-ELDH complex

[0045] Prepared according to the method and conditions of step (b) in Example 1;

[0046] (c) Preparation of IL-GR-ELDH hybrid material

[0047] Weigh 40 mg of the GO-ELDH hybrid obtained in step (b) and disperse it in deionized water to make the concentration 0.5 mg / mL, slowly add 20 mg IL and 20 mg KOH, and then sonicate for 30 min; Heat and stir at ℃ for 24h, centrifuge at 4000rpm for 5min, wash with water and absolute ethanol three times in turn, the obtained black solid particle is the IL-GR-ELDH complex, and its specific surface area is 196.37m 2 / g, the average particle size is between 610nm and the monodispersity index is 0.296.

Embodiment 3

[0049] (a) Preparation of ELDH nanosheets

[0050] Dissolve nickel chloride hexahydrate and ferric chloride hexahydrate in a molar ratio of 3:1 in 64mL of ultrapure water, so that the total concentration of metal ions is 0.02mol / L, stir to dissolve completely, and then slowly mix 14mL. .2M urea and 2mL0.01M trisodium citrate, the mixed solution was transferred to the reaction kettle, and reacted at 150°C for 24h. After the reaction solution was centrifuged, it was washed three times with deionized water and ethanol respectively, and the obtained CO 3 2- -LDH is dispersed in a mixed aqueous solution of 1mol / L NaCl and 3.3mmol / L HCl, N 2 Stirred under the atmosphere for 12 hours, after suction filtration, Cl - -LDH, and then dispersed in NaNO with a concentration of 0.1mol / L 3 In aqueous solution, N 2 Stir under atmosphere for 12 hours, then dry at room temperature for 12 hours after suction filtration to obtain NO 3 - -LDH, and then a certain amount of NO 3 - -LDH hybri...

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Abstract

The invention discloses graphene / stripped hydrotalcite composite material non-noble metal bifunctional oxygen catalyst modified covalently by an ionic liquid, a preparation method thereof, and an electrical catalytic application of the catalyst for an oxygen evolving reaction (OER) and an oxygen reduction reaction (ORR) in an alkaline medium. By means of special solubility and high electric-conductivity the ionic liquid, through covalent modification, the ionic liquid is introduced onto surface of a graphene / stripped hydrotalcite composite material to prepare the graphene / stripped hydrotalcite composite material modified covalently by the ionic liquid. The oxygen catalyst, under an alkaline condition, has high OER and ORR bifunctional catalytic activity, excellent dispersibility and excellent methanol tolerance, is low in raw material cost and simple in preparation method, is easy to use and is convenient to produce in large scale.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to an amino-functionalized ionic liquid covalently modified graphene-exfoliated hydrotalcite-like bifunctional oxygen catalyst; it also relates to a preparation method of the catalyst and its alkaline Electrocatalytic applications in the oxygen evolution reaction at the anode of electrolyzed water and the oxygen reduction reaction at the cathode of fuel cells. 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 spl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92
CPCH01M4/90H01M4/9041H01M4/92Y02E60/50
Inventor 詹天荣谭正伟张御妹
Owner 徐州兰岳企业管理服务有限公司
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