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A kind of double metal composite material and its preparation method and application

A composite material and bimetallic technology, which is applied in the field of bimetallic composite electrode materials and its preparation, can solve problems such as poor electrical conductivity, limited catalyst OER performance, and unfavorable effective transfer of electrons, achieving strong electrical conductivity, favorable for effective transfer, superior The effect of stability

Active Publication Date: 2019-01-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This metal alloy obtained by heating under the atmosphere of hydrogen, ammonia and argon forms a core-shell structure with oxides or hydroxides. Although the conductivity of the composite is increased, the conductivity of the oxide or hydroxide layer The performance is still poor, which is not conducive to the effective transfer of electrons, which will limit the OER performance of these catalysts
Although metal single substance or metal alloy / oxide or hydroxide core-shell structure is favorable for OH - and the transfer of electrons between the electrolyte and the electrode, but this is far from enough. It is also necessary to make the metal element or metal alloy and the oxide or hydroxide uniformly disperse each other in order to improve the OER performance of the electrode material

Method used

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  • A kind of double metal composite material and its preparation method and application
  • A kind of double metal composite material and its preparation method and application
  • A kind of double metal composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A. Add 0.066mol / L Ni(NO 3 ) 2 6H2O, 0.033mol / L Fe(NO 3 ) 3 9H 2 O, 0.5mol / L urea and 0.6g NH 4 F was dissolved in 80ml of ultrapure water, and after fully dissolving, the mixed salt solution was placed in a high-pressure reactor and reacted at 120°C for 25h. The obtained precipitate was centrifuged four times with absolute ethanol and ultrapure water, and then placed in an oven at 60° C. for 12 hours to dry. Denoted as NiFe-LDHs.

[0036] B. Weigh 0.4g of NiFe-LDHs precursor, 5g of sodium hypophosphite and 5g of sodium hydroxide in 40ml of ultrapure water, stir for 30min to make it evenly mixed, and then put the mixture into a high-pressure reactor at 160°C After reacting for 12 hours, the obtained product was centrifuged 4 times with absolute ethanol and ultrapure water and placed in a vacuum drying oven at 60°C for 12 hours to obtain a nickel / iron tetroxide composite material with the chemical formula Ni / Fe 3 o 4 .

[0037] Get 5.0mg nickel / iron tetroxide com...

Embodiment 2

[0039] A. Add 0.16mol / L Co(NO 3 ) 2 6H2O, 0.055mol / L Fe(NO 3 ) 3 9H 2 O and 0.3g of NH 4 F was dissolved in 50ml ultrapure water, fully dissolved, and then slowly added dropwise 2mol / L NaOH solution (4gNaOH dissolved in 50ml ultrapure water) to adjust the pH to 8 under continuous stirring. Then the suspension was placed in an autoclave at 80° C. for 12 h. The obtained precipitate was centrifuged four times with absolute ethanol and ultrapure water, and then placed in an oven at 60° C. for 12 hours to dry. Denoted as CoFe-LDHs.

[0040] B. Weigh 0.4g of CoFe-LDHs precursor, 5g of sodium hypophosphite and 5g of sodium hydroxide in 40ml of ultrapure water, stir for 30min to make it evenly mixed, and then put the mixture into an autoclave at 160°C After reacting for 12 hours, the obtained product was centrifuged with absolute ethanol and ultrapure water for 4 times and placed in a vacuum oven at 60°C to dry for 12 hours. Finally, a cobalt iron / cobalt ferrite composite mater...

Embodiment 3

[0042] A. Prepare NiFe-LDHs with the method of embodiment 1.

[0043] B. Weigh 0.4g of NiFe-LDHs precursor, 5g of sodium hypophosphite and 5g of sodium hydroxide in 40ml of ultrapure water, stir for 30min to make it evenly mixed, and then put the mixture into a high-pressure reactor at 140°C After reacting for 12 hours, the resulting product was centrifuged 4 times with absolute ethanol and ultrapure water and placed in a vacuum oven at 60°C to dry for 12 hours. Finally, nickel / iron tetroxide / nickel hydroxide composite material was obtained, and its chemical formula was Ni / Fe 3 o 4 / Ni(OH) 2 .

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Abstract

The invention provides a bimetal composite electrode material and its preparation method and application. The preparation method provided by the invention uses a highly reducing reducing agent to directly obtain the bimetallic composite electrode material through hydrothermal reduction of hydrotalcite. The preparation method is simple and the cost is low. Since the elements on the hydrotalcite laminate skeleton are distributed evenly, the nanoparticles and nanosheets obtained by reduction are evenly dispersed with each other. The resulting bimetallic composite material has good dispersion and has more active sites exposed to the outside. Better increasing the conductivity of the electrode material is conducive to the effective transfer of electrons, making the electrode material have better OER activity. The obtained product has good dispersion and strong electrical conductivity. Due to the synergistic effect of the multi-component of this product, the electrode material has low starting potential, low Tafel slope, superior stability, and has wide application value in electrocatalysis.

Description

Technical field: [0001] The invention belongs to the field of bimetallic composite material preparation, and in particular relates to a bimetallic composite electrode material and a preparation method and application thereof. Background technique: [0002] With the development of human civilization, the contradiction of energy shortage has become increasingly prominent. The research and utilization of new, sustainable, pollution-free and high-efficiency energy sources have attracted the attention of scientific researchers all over the world. As a fuel, hydrogen energy has the advantages of large heat release per unit, clean and pollution-free products, and zero emissions. An ideal new energy fuel. Electrolysis of water to produce hydrogen and oxygen is a key link in the new energy conversion system related to the use of idle energy and chemical energy storage. The oxidation-reduction reaction of electrolyzing water to produce hydrogen and oxygen mainly covers two basic hal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/06B01J23/755
CPCC25B1/04B01J23/755C25B11/091B01J35/33Y02E60/36
Inventor 雷晓东何彩云孔祥贵邵渊金城
Owner BEIJING UNIV OF CHEM TECH