Preparation method of V-doped NiO coated V-doped Ni3S2 core-shell structure

A core-shell structure, nickel foam technology, applied in the field of composite material preparation, can solve problems such as poor structural stability, and achieve the effects of fast reaction kinetics, improved electronic structure, excellent electrocatalytic oxygen evolution and hydrogen evolution performance and stability

Active Publication Date: 2019-12-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, Ni 3 S 2 Poor structural stability during water splitting

Method used

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  • Preparation method of V-doped NiO coated V-doped Ni3S2 core-shell structure
  • Preparation method of V-doped NiO coated V-doped Ni3S2 core-shell structure
  • Preparation method of V-doped NiO coated V-doped Ni3S2 core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Add 0.2g of vanadium chloride and 0.5g of urea into 25ml of ultrapure water and stir to obtain solution A; Put it in a vinyl fluoride liner and seal it, then put it into a homogeneous reactor for hydrothermal reaction at 135°C for 10h, cool to room temperature and take out the nickel foam, wash it with ultrapure water and absolute ethanol, and dry it in vacuum at 25°C for 4h to obtain NiV-LDH / NF grown on nickel foam in situ using nickel foam as nickel source;

[0033] The nickel foam used was ultrasonically cleaned in acetone for 10 minutes, then ultrasonically cleaned in 2mol / L hydrochloric acid for 15 minutes to remove surface impurities, rinsed alternately with ethanol and deionized water, and then vacuum-dried at 35°C for 3 hours;

[0034] 2) Add 40mg of thioacetamide to 20ml of deionized water to obtain a thioacetamide solution; put the thioacetamide solution and the NiV-LDH / NF obtained in step 1) into a hydrothermal kettle and heat at 128°C Cool to room temper...

Embodiment 2

[0037] 1) Add 0.1g of vanadium chloride and 0.3g of urea into 23ml of ultrapure water and stir to obtain solution A; Put it in a vinyl fluoride liner and seal it, then put it into a homogeneous reaction apparatus and conduct a hydrothermal reaction at 130°C for 12 hours, cool to room temperature and take out the nickel foam, wash it with ultrapure water and absolute ethanol, and dry it in vacuum at 35°C for 3 hours to obtain NiV-LDH / NF grown on nickel foam in situ using nickel foam as nickel source;

[0038] The nickel foam used was ultrasonically cleaned in acetone for 5 minutes, then ultrasonically cleaned in 3mol / L hydrochloric acid for 10 minutes to remove surface impurities, rinsed alternately with ethanol and deionized water, and then vacuum-dried at 25°C for 4 hours;

[0039] 2) Add 40mg of thioacetamide to 25ml of deionized water to obtain a thioacetamide solution; put the thioacetamide solution and the NiV-LDH / NF obtained in step 1) into a hydrothermal kettle and heat...

Embodiment 3

[0042]1) Add 0.15g of vanadium chloride and 0.4g of urea into 20ml of ultrapure water and stir to obtain solution A; Put it in a vinyl fluoride liner and seal it, then put it into a homogeneous reactor for hydrothermal reaction at 125°C for 14h, cool to room temperature and take out the nickel foam, wash it with ultrapure water and absolute ethanol, and dry it in vacuum at 30°C for 3.5h Obtain NiV-LDH / NF grown on nickel foam in situ with nickel foam as nickel source;

[0043] The nickel foam used was ultrasonically cleaned in acetone for 8 minutes, then ultrasonically cleaned in 2.5mol / L hydrochloric acid for 13 minutes to remove surface impurities, rinsed alternately with ethanol and deionized water, and then vacuum-dried at 30°C for 3.5 h;

[0044] 2) Add 40mg of thioacetamide to 20ml of deionized water to obtain a thioacetamide solution; put the thioacetamide solution and the NiV-LDH / NF obtained in step 1) into a hydrothermal kettle and heat at 130°C Cool to room temperat...

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Abstract

The invention discloses a preparation method of a V-doped NiO coated V-doped Ni3S2 core-shell structure. The preparation method comprises the steps of: vanadium chloride and urea into ultrapure waterto obtain a solution A; placing the solution A and foamed nickel into a reactor liner, sealing the reactor liner, putting the reactor liner into a homogeneous reaction instrument, carrying out hydrothermal reaction, and cleaning and drying the reaction product to obtain NiV-LDH / NF growing on the foamed nickel in situ; adding a thioacetamide solution NiV-LDH / NF into a hydrothermal kettle, carryingout hydrothermal reaction, and cooling the reaction product to room temperature; and placing the reaction kettle at room temperature for 20-24 hours, taking out the foamed nickel, and cleaning and drying the product to obtain the V-doped Ni3S2 core-shell structure electro-catalytic material coated with V-doped NiO. Foamed nickel is used as a nickel source, and vanadium chloride and urea are used as a vanadium source and an alkali source respectively, so that a NiV-LDH / NF precursor growing on the surface of the foamed nickel in situ is obtained, wherein release of nickel ions in the foamed nickel is accelerated in the presence of vanadium ions; meanwhile, the morphology of NiV-LDH is regulated and controlled, and the obtained in-situ NiV-LDH / NF is extremely high in structural stability. Theprepared composite material with the final core-shell structure has excellent electro-catalytic oxygen evolution and hydrogen evolution performance and stability and high reaction kinetics.

Description

technical field [0001] The invention belongs to a method for preparing a composite material with a core-shell structure, in particular to a V-doped Ni coated with V-doped NiO 3 S 2 Preparation method of core-shell structure. Background technique [0002] With the depletion of fossil fuels and the increase of related environmental pollution, it is very urgent to find green and renewable energy sources to solve these problems. Hydrogen, with its high energy density, is considered an ideal alternative energy carrier due to its purity and sustainability. Water electrolysis, a green hydrogen production process, is considered to be a promising method to generate hydrogen fuel. The water electrolysis process is generally divided into two half-reactions of hydrogen evolution and oxygen evolution. But both of them need to overcome a large energy barrier during the reaction process, so it is necessary to find a catalyst to speed up the reaction speed. [0003] Ni 3 S 2 With the...

Claims

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Application Information

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IPC IPC(8): C01G53/11C01G53/04C01B3/04
CPCC01G53/11C01G53/04C01B3/042C01P2002/72C01P2004/04C01P2004/80C01P2006/40C01B2203/0277C01B2203/1058C01B2203/1205Y02E60/36
Inventor 黄剑锋刘倩倩曹丽云李康冯亮亮
Owner SHAANXI UNIV OF SCI & TECH
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