Hydrotalcite quantum dot electrocatalyst, preparation method thereof, application of hydrotalcite quantum dot electrocatalyst in electrocatalytic decomposition of water to produce oxygen

A technology of electrocatalysts and quantum dots, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve low cost, simple process, and superior catalytic performance

Active Publication Date: 2015-05-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the rate-limiting step is electrochemical oxygen generation, the main reason is the four-electron oxidation process, and the high overpotential further limits its application.
The previous electrocatalysts mainly focused on noble metals such as Ru and Ir, and there are few studies on base metals that are abundant in the earth’s crust.

Method used

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  • Hydrotalcite quantum dot electrocatalyst, preparation method thereof, application of hydrotalcite quantum dot electrocatalyst in electrocatalytic decomposition of water to produce oxygen
  • Hydrotalcite quantum dot electrocatalyst, preparation method thereof, application of hydrotalcite quantum dot electrocatalyst in electrocatalytic decomposition of water to produce oxygen
  • Hydrotalcite quantum dot electrocatalyst, preparation method thereof, application of hydrotalcite quantum dot electrocatalyst in electrocatalytic decomposition of water to produce oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Preparation of NiCo-LDHs hydrotalcite quantum dot electrocatalyst:

[0050] Preparation of microemulsion: Add 5ml of isopropanol, 8ml of oleylamine, and 4ml of deionized water into the flask, stir until the solution is uniform, and obtain a microemulsion environment; add 0.0048mol of Ni(NO 3 ) 2 ·6H 2 O and 0.0024mol of Co(NO 3 ) 3 9H 2 O was added to the microemulsion prepared above, and after the salt was dissolved, the crystallization water was heated at 100°C for 27 hours.

[0051] After the reaction was completed, the product was filtered with suction, washed three times with a mixed solution of deionized water and ethanol with a volume ratio of 1:1, washed once with absolute ethanol, centrifuged, and dried at 60°C for 14 hours to obtain NiCo-LDHs Quantum dot precursor products.

[0052] The above precursor products were dispersed into formamide, sonicated by a high-power ultrasonic instrument for 4 hours, centrifuged at low speed to remove the bottom sedi...

Embodiment 2

[0059] Preparation of NiFe-LDH hydrotalcite quantum dot electrocatalyst:

[0060] Preparation of microemulsion: Add 3ml of isopropanol, 6ml of oleylamine dioctylamine, and 5ml of deionized water into the flask, and stir until the solution is uniform; add 0.004mol of Ni(NO 3 ) 2 ·6H 2 O and 0.002mol Fe(NO 3 ) 3 9H 2 O was added to the microemulsion prepared above, and after the salt was dissolved, the crystallization water was heated at 80°C for 20 hours.

[0061] After the reaction was completed, the product was filtered with suction, washed three times with a mixed solution of deionized water and ethanol with a volume ratio of 1:1, washed once with absolute ethanol, centrifuged, and dried at 90°C for 6 hours to obtain NiFe-LDHs Quantum dot precursor products.

[0062] Disperse the above precursor product into N,N-dimethylformamide, use a high-power ultrasonic instrument to sonicate for 6 hours, and centrifuge at low speed to remove the bottom sediment, and then perform ...

Embodiment 3

[0067] Preparation of NiTi-LDH hydrotalcite quantum dot electrocatalyst:

[0068] Preparation of microemulsion: Add 3ml of isopropanol, 5ml of oleylamine N,N-dimethyltetradecylamine, and 7ml of deionized water into the flask, stir until the solution is uniform; add 0.006mol of Ni(NO 3 ) 2 ·6H 2 O and 0.003 mil of TiCl4 were added to the microemulsion prepared above, and after the salt was dissolved, the crystallization water was heated at 120° C. for 15 hours.

[0069] After the reaction was completed, the product was suction-filtered, washed twice with a mixed solution of deionized water and ethanol with a volume ratio of 1:1, washed once with absolute ethanol, centrifuged, and dried at 70°C for 10 h to obtain NiTi-LDHs Quantum dot precursor products.

[0070] Disperse the above precursor products into N, N-dimethylformamide, use a high-power ultrasonic instrument to sonicate for 5 hours, and centrifuge at low speed to remove the bottom sediment, and then perform high-spee...

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Abstract

The invention discloses a hydrotalcite quantum dot electrocatalyst. The hydrotalcite quantum dot electrocatalyst adopts a chemical formula (I): [M<2+>1-xN<3+>x(OH)2]<x+>.(A<n->)x / n.mH2O (I), or a chemical formula (II): [M<2+>1-xY<4+>x(OH)2]<2x+>.(A<n->)2x / n.mH2O (II), wherein M<2+> is one or more of Ni<2+>, Zn<2+>, Mg<2+> and Ca<2+>; N<3+> is one or more of Co<3+>, Fe<3+>, Cr<3+>, Al<3+> and Mn<3+>; Y<4+> is Ti<4+>; A<n-> is NO3<-> or CO3<2->; x is larger than or equal to 0.16 and smaller than or equal to 0.50; n is the valence number of a negative ion; m is the quantity of crystal water, and is larger than or equal to 0.5 and smaller than or equal to 9; the hydrotalcite quantum dot electrocatalyst is 5 to 100 nm in size, and 0.5 to 5 nm in thickness. The invention further provides a preparation method and application of the hydrotalcite quantum dot electrocatalyst. The hydrotalcite quantum dot electrocatalyst has an obvious quantum size effect, and an excellent catalytic performance in electrocatalytic decomposition of water to produce oxygen, and is greatly lower in overpotential. The preparation method is low in cost, and simple and convenient to operate. The hydrotalcite quantum dot electrocatalyst can be applied to the fields such as photoelectrocatalysis.

Description

technical field [0001] The invention relates to the technical field of quantum dot catalysts. More specifically, it relates to a hydrotalcite quantum dot, its preparation method and its application in electrocatalytic decomposition of water for oxygen generation. Background technique [0002] Quantum dots (particles with a size below 100nm), because of their unique physical and chemical characteristics compared to bulk bulk materials, especially because of their quantum size confinement effect, abundant groups on the surface, high specific surface bulk ratio, and The cost is low, and it has attracted wide attention and applications in catalysis and luminescence. At present, quantum dots that have been studied more are mainly concentrated in semiconductor materials such as CdSe, CdS, and CdTe, and their applications are mainly focused on photocatalytic decomposition of water to produce hydrogen. However, due to the toxicity and other problems of quantum dots in use, their p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/80B01J23/34C25B1/04
CPCY02E60/36
Inventor 张铁锐赵宇飞陈广波加晓丹吴骊珠佟振合
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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