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A preparation method of nickel-tungsten carbide nanocomposite powder used as electrocatalyst

A tungsten carbide nano-composite powder technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of particle size and distribution, uneven pore structure, coating composition and thickness Control, non-compliance with green production requirements and other issues, to achieve the effect of improving catalytic activity, fine particle size, and small particle size

Active Publication Date: 2022-03-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is low in cost, simple and easy to implement, but it is difficult to control the composition and thickness of the coating, and the electroplating pollution is serious, which does not meet the requirements of green production
[0007] Therefore, in general, in the current methods for preparing nickel-tungsten carbide composite electrocatalysts, some of them take a long time to prepare, and some have problems of particle size and distribution, and uneven pore structure.

Method used

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  • A preparation method of nickel-tungsten carbide nanocomposite powder used as electrocatalyst
  • A preparation method of nickel-tungsten carbide nanocomposite powder used as electrocatalyst
  • A preparation method of nickel-tungsten carbide nanocomposite powder used as electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take nickel nitrate (Ni(NO 3 ) 2 )0.01mol, ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 ) 0.24mol, ethylenediaminetetraacetic acid 0.0072mol, and glycine 0.072mol; each raw material powder was dissolved in an appropriate amount of deionized water, and stirred until completely dissolved to obtain a mixed solution;

[0034] (2) Heating the mixture in a muffle furnace at a constant temperature of 200°C for 3 hours to obtain a precursor powder;

[0035] (3) The precursor powder is carbonized at 800°C for 4h in a mixed atmosphere of methane and hydrogen (the volume ratio of methane is 10%), and the flow rate of the mixed gas is 150mL / min, that is, the nickel tungsten carbide nanometer used as an electrocatalyst is obtained. Composite powder.

[0036] After characterization, the nickel-tungsten carbide nanocomposite powder obtained in this example has a diameter of 50-120 nm. at 1mol L -1 In the potassium hydroxide solut...

Embodiment 2

[0038] (1) Take nickel nitrate (Ni(NO 3 ) 2 )0.01mol, ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 ) 0.24mol, ethylenediaminetetraacetic acid 0.005mol, and glycine 0.072mol; each raw material powder was dissolved in an appropriate amount of deionized water, and stirred until completely dissolved to obtain a mixed solution;

[0039] (2) Heating the mixture in a muffle furnace at a constant temperature of 200°C for 3 hours to obtain a precursor powder;

[0040] (3) The precursor powder is carbonized at 750°C for 3h in a mixed atmosphere of methane and hydrogen (the volume ratio of methane is 10%), and the flow rate of the mixed gas is 150mL / min, that is, the nanometer nickel tungsten carbide used as an electrocatalyst is obtained. Composite powder.

[0041] After characterization, the nickel-tungsten carbide nanocomposite powder obtained in this example has a diameter of 60-150 nm. at 1mol L -1In the potassium hydroxide solutio...

Embodiment 3

[0043] (1) Take nickel nitrate (Ni(NO 3 ) 2 )0.01mol, ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 ) 0.24mol, EDTA 0.005mol, citric acid (C 6 h 8 o 7 ·H 2 (0) 0.1mol; Each raw material powder is dissolved in an appropriate amount of deionized water, and stirred until completely dissolved to obtain a mixed solution;

[0044] (2) Heating the mixture in a muffle furnace at a constant temperature of 200°C for 3 hours to obtain a precursor powder;

[0045] (3) The precursor powder is carbonized at 900°C for 2h in a mixed atmosphere of methane and hydrogen (the volume ratio of methane is 10%), and the flow rate of the mixed gas is 150mL / min, that is, the nickel tungsten carbide nanometer used as an electrocatalyst is obtained. Composite powder.

[0046] After characterization, the nickel-tungsten carbide nanocomposite powder obtained in this example has a diameter of 60-160 nm. at 1mol L -1 In the potassium hydroxide solution, ...

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Abstract

The invention discloses a method for preparing a nickel-tungsten carbide nano-composite powder used as an electrocatalyst. The precursor composite powder is first synthesized by a liquid phase method, and then placed in a mixed atmosphere of methane and hydrogen for carbonization and reduction. That is, nano-scale nickel-tungsten carbide composite powder is obtained. In the nickel tungsten carbide nanocomposite powder prepared by the present invention, by controlling the reducing carbonization conditions, nickel oxide is reduced to form elemental nickel, which can form a synergistic effect with tungsten carbide, reduce the hydrogen evolution overpotential, and the obtained nanocomposite powder shows Good hydrogen evolution reaction (HER) catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and in particular relates to a preparation method of nickel-tungsten carbide nanocomposite powder used as an electrocatalyst. Background technique [0002] With the continuous development of modern social economy, the demand for resources is gradually increasing, and energy has become one of the key factors restricting the development of today's social economy. Hydrogen energy is a clean and efficient secondary energy source, and is regarded as one of the most potential energy sources in the 21st century. At present, electrolysis of water to produce hydrogen is the main way to obtain hydrogen in industry. Due to the existence of hydrogen evolution overpotential in the process of water electrolysis, the voltage of the electrolyzer increases, and the energy consumption also increases accordingly. In order to reduce the energy consumption of electrolysis generated by hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22
CPCB01J27/22B01J35/33
Inventor 程继贵高宇飞陈鹏起魏邦争高大路陈闻超卫陈龙朱曦
Owner HEFEI UNIV OF TECH