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Nanometer nickel cluster and vanadium carbide particle modified ultrathin carbon layer composite material, and preparation method and application thereof

A composite material, vanadium carbide technology, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of uncontrollable VC morphology, reduced catalytic activity, poor electrical conductivity of metal carbides, unfavorable electron transfer, etc. Hydrogen evolution performance, the effect of improving hydrogen evolution activity, excellent catalytic activity and stability

Pending Publication Date: 2022-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the uncontrollable morphology of VC limits the exposure of active sites, and the poor conductivity of metal carbides is not conducive to electron transfer in the catalytic process, which will reduce the catalytic activity.

Method used

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  • Nanometer nickel cluster and vanadium carbide particle modified ultrathin carbon layer composite material, and preparation method and application thereof
  • Nanometer nickel cluster and vanadium carbide particle modified ultrathin carbon layer composite material, and preparation method and application thereof
  • Nanometer nickel cluster and vanadium carbide particle modified ultrathin carbon layer composite material, and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0037] Preparation of nickel vanadium double hydroxides. After mixing nickel source, vanadium source, alkali source and solvent, microwave hydrothermal reaction at 90-110 DEG C to obtain nickel vanadium double metal hydroxide. Wherein, the nickel source is selected from nickel nitrate hexahydrate, nickel sulfate hexahydrate, or nickel chloride hexahydrate. The vanadium source can be vanadium chloride and the like. The alkali source is urea. The molar ratio of nickel source, vanadium source and alkali source is (0.5-2):1:(1.5-1.6). The microwave hydrothermal reaction time can be 2-4 hours, and the power is 200-400W.

[0038] Preparation of Precursor A. The obtained nickel-vanadium double metal hydroxide is subjected to ultrasonication in ethanol solution for 1-2 hours, the ultrasonic temperature is 60-80°C, and the ultrasonic power can be 180-200W. After drying at room temperature, the pretreated double metal hydroxide was finally obtained, denoted as precursor A.

[0039...

Embodiment 1

[0045] Mix nickel chloride hexahydrate, vanadium chloride and urea according to the molar ratio of 0.5:1:1.56 and add them into 25ml of ultrapure water and stir for 15 minutes to obtain solution A; put the stirred solution A in a microwave reactor, React at 110°C for 4 hours, with a power of 400W. After cooling to room temperature, wash with ultrapure water and absolute ethanol for 3 times, and dry in a vacuum oven for 5 hours to obtain nickel vanadium double metal hydroxide;

[0046] Ultrasonic the nickel-vanadium double metal hydroxide in ethanol solution for 2 hours, the ultrasonic temperature is 60°C, the ultrasonic power is 180W, and then dried at room temperature to finally obtain the precursor A;

[0047] Dicyandiamide and precursor A were mixed according to a mass ratio of 2:1 and fully ground for 30 minutes to obtain a mixed raw material;

[0048] Put the mixed raw materials in a porcelain boat, and put them in a tube furnace for 30 minutes under the argon protective ...

Embodiment 2

[0051] Mix nickel chloride hexahydrate, vanadium chloride and urea in a molar ratio of 1:1:1.56 and add them into 25ml ultrapure water and stir for 15 minutes to obtain solution A; put the stirred solution A in a microwave reactor, React at 110°C for 4 hours, with a power of 400W. After cooling to room temperature, wash with ultrapure water and absolute ethanol for 3 times, and dry in a vacuum oven for 5 hours to obtain nickel vanadium double metal hydroxide;

[0052] Ultrasonic the nickel-vanadium double metal hydroxide in ethanol solution for 2 hours, the ultrasonic temperature is 60°C, the ultrasonic power is 180W, and then dried at room temperature to finally obtain the precursor A;

[0053] Dicyandiamide and precursor A were mixed according to a mass ratio of 4:1 and fully ground for 30 minutes to obtain a mixed raw material;

[0054] Put the mixed raw materials in a porcelain boat, and put them in a tube furnace for 40 minutes under the argon protective atmosphere; Min ...

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Abstract

The invention relates to a nano nickel cluster and vanadium carbide particle modified ultrathin carbon layer composite material, and a preparation method and application thereof, wherein the composite material takes a two-dimensional ultrathin carbon layer as a matrix, metal nickel clusters and vanadium carbide nanoparticles are embedded in the matrix layer, and a coupling interface between Ni and C, a coupling interface between VC and C and a coupling interface between Ni and VC are formed; the thickness of the two-dimensional ultrathin carbon layer is 10 nm or less.

Description

[0001] technology field [0002] The invention relates to an ultra-thin carbon layer composite material modified by nano-nickel clusters and vanadium carbide particles, a preparation method and application thereof, and belongs to the field of preparation and application of electrocatalyst materials. Background technique [0003] "Energy crisis" and "environmental pollution" are two major problems plaguing human society today. People urgently need to seek clean and sustainable energy to alleviate them. Compared with fossil energy that produces a large amount of pollutants, hydrogen energy is considered to be a new generation of clean energy. Sustainable energy as an alternative to fossil fuels. As an efficient hydrogen production technology, water splitting hydrogen production technology has high expectations. For the slow hydrogen evolution reaction, in order to achieve a high conversion efficiency, a highly active and durable electrocatalyst plays an important role. Therefor...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J35/10B01J35/02B82Y30/00B82Y40/00C25B11/091C25B1/04
CPCB01J27/22B82Y30/00B82Y40/00C25B11/04C25B1/04B01J35/394B01J35/33B01J35/40B01J35/61C25B11/054C25B11/065C25B11/091Y02E60/36
Inventor 黄剑锋刘倩倩冯亮亮曹丽云李康
Owner SHAANXI UNIV OF SCI & TECH
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