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Self-assembled vanadium-modified NiSe/Ni3Se2 self-supporting electrode, synthesis method and application thereof

A technology of self-supporting electrode and synthesis method, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of limiting electrocatalyst activity, easy agglomeration, and reducing the exposed area of ​​reaction active sites.

Inactive Publication Date: 2021-02-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, Sivanantham et al. successfully synthesized Ni 3 Se 2 / NF self-supporting electrode, whose microscopic morphology is composed of aggregated particles, does not really realize the exposure to the amount of catalytic activity of the material, which will be detrimental to the further promotion of Ni 3 Se 2 Electrocatalytic properties of / NF materials
NiSe / Ni with bulk morphology prepared by Zhang et al. 3 Se 2 Self-supporting electrode, the particles on the surface of the electrode are poorly dispersed and easy to agglomerate, which reduces the exposed area of ​​reactive active sites, is not conducive to the rapid transport of electrons at the interface, and limits the activity of electrocatalysts

Method used

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  • Self-assembled vanadium-modified NiSe/Ni3Se2 self-supporting electrode, synthesis method and application thereof
  • Self-assembled vanadium-modified NiSe/Ni3Se2 self-supporting electrode, synthesis method and application thereof
  • Self-assembled vanadium-modified NiSe/Ni3Se2 self-supporting electrode, synthesis method and application thereof

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preparation example Construction

[0031] The invention provides a self-assembled vanadium-modified NiSe / Ni 3 Se 2 The synthesis method of self-supporting electrode comprises the following steps:

[0032] 1) Take the nickel foam and wash and dry it for subsequent use; preferably, the nickel foam is ultrasonically cleaned successively with acetone, hydrochloric acid, deionized water and dehydrated ethanol to remove impurities and oxide layers on the surface of the nickel foam, and wash to neutrality, and wash at normal temperature Drying at low temperature; more preferably, the concentration of hydrochloric acid is 2.8~3.2mol L -1, the ultrasonic treatment time of acetone is 10-15 minutes, and the ultrasonic treatment time of hydrochloric acid, deionized water and absolute ethanol is 5-10 minutes respectively. It should be noted that normal temperature is room temperature, and is defined as 25°C.

[0033] 2) Weigh selenium powder with a mass of 77.96-79.96 mg, add 1.8-2.2 ml of hydrazine hydrate and stir even...

Embodiment 1

[0040] 1) With acetone, the concentration is 3mol L -1 Dilute hydrochloric acid, deionized water and absolute ethanol ultrasonically clean the nickel foam in sequence to remove impurities and oxide layers on the surface, wash until neutral, and dry at room temperature to obtain the desired nickel foam;

[0041] 2) Weigh 78.90 mg of selenium powder and pour it into a beaker, add 2 ml of hydrazine hydrate and stir magnetically at 45° C. for 1.2 h to obtain solution A;

[0042] 3) Weighing 34.825 mg of sodium metavanadate as a morphology regulator of vanadium source and 28 mg of polyallylamine hydrochloride;

[0043] 4) Add the mixed solution A in step 2)) and the vanadium source and shape regulator weighed in step 3) into a high-temperature and high-pressure reactor with 20mL of pure water and a parapolystyrene liner. Stir to obtain solution B;

[0044] 5) Put 220-225 mg of nickel foam treated in step 1) into a high-temperature and high-pressure reaction kettle with a p-polyst...

Embodiment 2

[0047] 1) With acetone, the concentration is 3mol L -1 Dilute hydrochloric acid, deionized water and absolute ethanol ultrasonically clean the nickel foam in sequence to remove impurities and oxide layers on the surface, wash until neutral, and dry at room temperature to obtain the desired nickel foam;

[0048] 2) Weigh 78.58mg of selenium powder and pour it into a beaker, add 2ml of hydrazine hydrate and stir magnetically at 47°C for 1.2h to obtain solution A;

[0049] 3) Weighing 34.829mg of sodium metavanadate as a vanadium source and 25mg of polyallylamine hydrochloride as a morphology regulator;

[0050] 4) Add the vanadium source and the morphology regulator of mixed solution A in step 2) and step 3) to a high-temperature and high-pressure reactor with 19 mL of pure water and a parapolyphenyl liner, and stir magnetically at room temperature to obtain Solution B;

[0051] 5) Put 220-225 mg of nickel foam treated in step 1) into a high-temperature and high-pressure react...

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Abstract

The invention discloses a self-assembled vanadium-modified NiSe / Ni3Se2 self-supporting electrode, a synthesis method and application thereof. In the synthesis method, foamed nickel serves as a substrate, a selenium powder hydrazine hydrate solution serves as a selenium source, sodium metavanadate serves as a vanadium source, polyallylamine hydrochloride serves as a morphology regulating agent, andthe self-assembled vanadium-modified NiSe / Ni3Se2 self-supporting electrode is synthesized through a hydrothermal method, wherein the process conditions are mild, the cost is low, the preparation period is short, the technological process is easy to control, the obtained self-assembled vanadium-modified NiSe / Ni3Se2 self-supporting electrode is beneficial to exposing more catalytic active sites, the exchange of substances on a heterogeneous interface and the transfer rate of electrons are increased so as to synergistically enhance the catalytic activity and stability of the material, and the self-assembled vanadium-modified NiSe / Ni3Se2 self-supporting electrode is high in current density, has long-term cycling stability and higher electrocatalytic reaction activity, has higher electrocatalytic activity when being applied to water electrolysis reaction under alkaline conditions, and enhances the electrocatalytic hydrogen production performance.

Description

technical field [0001] The invention belongs to the field of preparation of new energy materials, and relates to the synthesis of metallic nano-array structures, in particular to a self-assembled vanadium-modified NiSe / Ni 3 Se 2 Self-supporting electrodes and their synthesis methods and applications. Background technique [0002] With the depletion of traditional fossil fuels and a series of environmental and social problems, it is particularly important to develop clean, safe, efficient and renewable new energy sources for the sustainable development of society. At present, new energy sources including solar energy, wind energy, tidal energy, and biomass energy have been widely used in many fields, but they are generally highly dependent on natural environments such as time and climate, and have intermittent and discontinuous characteristics, which are difficult to meet the requirements of sustainable energy. demand. Hydrogen (H 2 ) As one of the most ideal clean energy...

Claims

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Application Information

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IPC IPC(8): C25B11/031C25B11/091C25B11/052C25B1/04
CPCC25B1/04Y02E60/36
Inventor 曹丽云韩瑞雪何丹阳冯亮亮黄剑锋黄青青
Owner SHAANXI UNIV OF SCI & TECH
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