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Preparation method of nickel tungsten phosphide-nickel tungsten oxide with heterostructure

A technology of nickel-tungsten oxide and heterostructure, applied in phosphides, phosphorus compounds, chemical instruments and methods, etc., can solve the problems of limited active surface area, poor stability, poor conductivity, etc., and achieve abundant reserves and high-quality products The effect of uniform shape distribution and low cost

Active Publication Date: 2021-06-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, among the many transition metal phosphides, some phosphides have disadvantages such as poor conductivity, poor stability, and limited active surface area due to their single composition, which hinders their performance.

Method used

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  • Preparation method of nickel tungsten phosphide-nickel tungsten oxide with heterostructure
  • Preparation method of nickel tungsten phosphide-nickel tungsten oxide with heterostructure
  • Preparation method of nickel tungsten phosphide-nickel tungsten oxide with heterostructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] ⑴Cut NF into 2×3cm 2 The small pieces were ultrasonically cleaned in 3M concentrated hydrochloric acid for 20 min to remove oxides on the surface of NF; after that, they were washed three times with absolute ethanol and deionized water.

[0030] (2) Weigh a certain mass of Ni(NO 3 ) 2 ·6H 2 O and (NH 4 ) 6 h 2 W 12 o 40 ·nH 2 O was added to deionized water at the same time to prepare a mixed solution, wherein the molar ratio of Ni:W was controlled to be 1:3, the concentration of nickel source was 0.016mol / L, and the concentration of tungsten source was 0.0042mol / L, and ultrasonically mixed at room temperature After 20 min, a clear blue solution A was obtained.

[0031] (3) Put the NF treated in step (1) at an angle of 45° into the inner lining of the reaction kettle made of polytetrafluoroethylene for sealing, then put the inner lining into a stainless steel outer kettle to fix, and finally place the outer kettle in an electric blast In a dry box, hydrothermal...

Embodiment 2

[0035] ⑴Cut NF into 2×3cm 2 The small pieces were ultrasonically cleaned in 2M concentrated hydrochloric acid for 25 min to remove oxides on the surface of NF; after that, they were washed 4 times with absolute ethanol and deionized water respectively.

[0036] (2) Weigh a certain mass of Ni(NO 3 ) 2 ·6H 2 O and (NH 4 ) 6 h 2 W 12 o 40 ·nH 2 O was added to 30ml deionized water at the same time to prepare a mixed solution, wherein the molar ratio of Ni:W was controlled to be 3:1, the concentration of nickel source was 0.05mol / L, and the concentration of tungsten source was 0.0014mol / L. After mixing for 25 min, a clear blue solution A was obtained.

[0037] (3) Put the NF treated in step (1) at an angle of 55° into the lining of the reaction kettle made of polytetrafluoroethylene to seal, then put the inner lining into a stainless steel outer kettle to fix, and finally place the outer kettle in an electric blast In a dry box, hydrothermal reaction was carried out at 19...

Embodiment 3

[0041] ⑴Cut NF into 2×3cm 2 The small piece was ultrasonically cleaned in 4M concentrated hydrochloric acid for 30 min to remove oxides on the surface of NF; after that, it was washed 5 times with absolute ethanol and deionized water respectively.

[0042] (2) Weigh a certain mass of Ni(NO 3 ) 2 ·6H 2 O and (NH 4 ) 6 h 2 W 12 o 40 ·nH 2 O was added to 30ml deionized water at the same time to prepare a mixed solution, wherein the molar ratio of Ni:W was controlled to be 1:1, the concentration of nickel source was 0.03mol / L, and the concentration of tungsten source was 0.0028mol / L. After mixing for 15 min, a clear blue solution A was obtained.

[0043] (3) Put the NF processed in step (1) at an angle of 65° into the inner lining of the reaction kettle made of polytetrafluoroethylene for sealing, then put the inner lining into a stainless steel outer kettle to fix, and finally place the outer kettle in an electric blast In a drying oven, hydrothermal reaction was carrie...

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Abstract

The invention discloses a preparation method of a nickel tungsten phosphide-nickel tungsten oxide with a heterostructure, which relates to the field of catalytic electrodes for energy conversion. The nickel tungsten phosphide-nickel tungsten oxide with the heterostructure is prepared on foamed nickel by adopting a hydrothermal method and a tubular furnace phosphating method. When water is electrolyzed in an alkaline medium, the material with the heterostructure shows excellent electro-catalytic hydrogen evolution performance and cycling stability as a cathode material, the current density of 10 mA / cm<2> can be reached only by 115 mV overpotential, and the hydrogen evolution catalytic activity of the material can be comparable with that of a noble metal platinum group catalyst. The heterostructure nickel tungsten phosphide-nickel tungsten oxide designed from the microscopic level is low in synthesis cost and simple and convenient in process, and has a good application prospect in the aspects of replacing a noble metal catalyst and large-scale implementation of hydrogen production by water electrolysis.

Description

technical field [0001] The invention relates to the field of catalytic electrodes for energy conversion, in particular to a preparation method and application of a heterostructure nickel-tungsten phosphide-nickel-tungsten oxide. Background technique [0002] Environmental pollution caused by excessive consumption of fossil fuels poses a serious threat to the sustainable development of human beings. Hydrogen has the advantages of high calorific value and zero pollution. Therefore, building a "hydrogen economy" with hydrogen as the main energy carrier is inevitable for sustainable development. trend. Among the many ways to produce hydrogen, hydrogen production by electrolysis of water is the most green and efficient. However, the hydrogen production efficiency of electrolyzed water is limited by the high overpotential required for the multi-electron transfer of hydrogen evolution / oxygen evolution, which makes it consume a lot of energy. For the hydrogen evolution reaction, p...

Claims

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Application Information

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IPC IPC(8): C01G53/04C01B25/08C25B1/04C25B11/04
CPCC01G53/04C01B25/088C25B1/04C01P2002/72C01P2004/03C01P2006/40Y02E60/36
Inventor 范爱玲庞伟谢登奎郭亚奇高殿超
Owner BEIJING UNIV OF TECH
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