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Preparation method of Ni3S2/NiV-LDH heterogeneous nanocone electrocatalyst

An electrocatalyst and nanocone technology, which can be used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of large influence of gas flow rate, small electrochemical surface area, and difficult shape control, etc. To achieve the effect of easy control of morphology, simple operation and excellent electrochemical performance

Active Publication Date: 2020-07-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent "A self-supporting nickel disulfide electrode and its preparation method and application" with the application number CN201910636584.4 synthesized materials with tree-shaped, porous flower-like and coral-like structures, whose morphology is not easy to control, and has The electrochemical surface area is small
[0005] The Chinese patent with the application number CN201810342048.9 "Preparation method of nickel disulfide-nickel electrode material for hydrogen production by electrolysis of water" adopts cold plasma etching technology, the process is relatively complicated, and the gas flow rate has a great influence and is difficult to control , the reaction conditions are more severe

Method used

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  • Preparation method of Ni3S2/NiV-LDH heterogeneous nanocone electrocatalyst
  • Preparation method of Ni3S2/NiV-LDH heterogeneous nanocone electrocatalyst
  • Preparation method of Ni3S2/NiV-LDH heterogeneous nanocone electrocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Take NiCl according to the molar ratio of 2:0.5:8 3 ·6H 2 O, VCl 3 Dissolve with urea in 25ml of ultrapure water at the same time, and stir magnetically at room temperature to obtain a uniform solution A with a nickel ion concentration of 0.03mol / L;

[0034] 2) Dip the cut foamed nickel into pure acetone and hydrochloric acid solution with a concentration of 4mol / L and ultrasonically clean it for 15 minutes, then repeat the ultrasonic cleaning with ultrapure water and ethanol alternately, then dry it in vacuum at 30°C for 5 hours to obtain a foamed nickel conductive matrix ;

[0035] Transfer the solution A to the reaction kettle and add the foamed nickel conductive substrate for 10 hours of hydrothermal reaction at 150°C. After the reaction is completed, cool to room temperature and take out the product, wash it with ethanol and water alternately, and dry it naturally to obtain a nanosheet array structure. Precursor;

[0036] 3) Dissolving thiourea in 30 mL of iso...

Embodiment 2

[0039] 1) Take NiCl according to the molar ratio of 4:1.5:6 3 ·6H 2 O, VCl 3 Dissolve in 25ml of ultrapure water with urea at the same time, and magnetically stir at room temperature to obtain a uniform solution A with a nickel ion concentration of 0.04mol / L;

[0040] 2) Dip the trimmed nickel foam into pure acetone and hydrochloric acid solution with a concentration of 2mol / L and ultrasonically clean it for 10 minutes, then repeat the ultrasonic cleaning with ultrapure water and ethanol alternately, and then dry it in vacuum at 25°C for 4 hours to obtain a foamed nickel conductive matrix ;

[0041] Transfer the solution A to the reaction kettle and add foamed nickel conductive substrate to react in hydrothermal reaction at 100°C for 12 hours. After the reaction is completed, cool to room temperature and take out the product, wash it with ethanol and water alternately and dry it naturally to obtain a nanosheet array structure. Precursor;

[0042] 3) Dissolve thioacetamide ...

Embodiment 3

[0045] 1) Take NiCl according to the molar ratio of 3:1.8:7 3 ·6H 2 O, VCl 3 Dissolve with urea in 25ml of ultrapure water at the same time, and magnetically stir at room temperature to obtain a uniform solution A with a nickel ion concentration of 0.02mol / L;

[0046] 2) Dip the cut nickel foam into pure acetone and 3mol / L hydrochloric acid solution for ultrasonic cleaning for 5 minutes, then repeat the ultrasonic cleaning with ultrapure water and ethanol alternately, then vacuum dry at 35°C for 3 hours to obtain a foam nickel conductive matrix ;

[0047] Transfer the solution A to the reaction kettle and add the foamed nickel conductive substrate to react in hydrothermal reaction at 140°C for 8 hours. After the reaction is completed, cool to room temperature and take out the product, wash it with ethanol and water alternately and dry it naturally to obtain a nanosheet array structure. Precursor;

[0048] 3) Dissolve ethanethiol in 20 mL of isopropanol, and stir magnetical...

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Abstract

The invention relates to a preparation method of a Ni3S2 / NiV-LDH heterogeneous nanocone electrocatalyst, which adopts a hydrothermal-solvothermal method to prepare the electrocatalyst, and comprises the following steps: soaking foamed nickel in an aqueous solution containing a nickel source, a vanadium source and an alkali source, and carrying out hydrothermal reaction to obtain a precursor with ananosheet array structure; preparing a Ni3S2 / NiV-LDH heterogeneous nanocone electrocatalyst through immersing the precursor in an isopropanol solution containing an organic sulfur source and carryingout a solvothermal reaction, wherein the Ni3S2 / NiV-LDH heterogeneous nanocone electrocatalyst is formed by covering a foamed nickel substrate with a nanoscale morphology formed by embedding a large amount of Ni3S2 nanoparticles into the surface of NiV-LDH pyramids. The method provided by the invention is mild in condition; produced products are uniform in morphology, the pyramidal structure can significantly increase the electrochemical active area, nickel sulfide has low overpotential, the embedding of the nanoparticles can effectively increase the length of the edge state to increase the number of active sites, and the interlacing of the nanocones facilitates the improvement of the stability of the material and greatly improves the electro-catalytic hydrogen production and oxygen production activity of the material.

Description

technical field [0001] The invention relates to an electrocatalyst and a preparation method thereof, in particular to a Ni 3 S 2 / NiV-LDH heterogeneous nanocone electrocatalyst and its preparation method. Background technique [0002] In recent years, countries around the world have developed rapidly in science and technology, and energy has been continuously developed, but the global energy shortage and environmental pollution caused by it cannot be ignored. Due to its high energy consumption, non-renewable fossil fuels have become one of the culprits of environmental problems and cannot meet the requirements of sustainable development. The emergence of new secondary energy has brought a turning point for solving energy and environmental problems. As a low-carbon or even zero-carbon energy, hydrogen energy has entered people's field of vision. It not only has high energy density, but also can be stored in various forms for easy portability and transportation. It is expec...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/02B01J35/10B01J37/08B01J37/10C25B1/04C25B11/06
CPCB01J27/043B01J37/10B01J37/08C25B1/04C25B11/051C25B11/057C25B11/091B01J35/00B01J35/30B01J35/33B01J35/61Y02E60/36
Inventor 冯亮亮付常乐黄剑锋曹丽云冯永强
Owner SHAANXI UNIV OF SCI & TECH
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