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

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...

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