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A nitrogen-doped carbon-coated ni&moo 2 Ultrafine nanowires and their preparation methods and applications

A nitrogen-doped carbon, ultra-fine nanotechnology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of agglomeration, less active sites, and limiting the catalytic activity of hydrogen evolution reaction, etc. Achieve the effect of improving acid resistance, improving catalytic activity, excellent catalytic activity and durability of hydrogen evolution reaction

Active Publication Date: 2019-08-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recent studies have found that both Mo atom edges and O atom edges are catalytically active sites, but MoO 2 There are severe agglomeration and few active sites, which severely limit its catalytic activity for hydrogen evolution reaction

Method used

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  • A nitrogen-doped carbon-coated ni&moo <sub>2</sub> Ultrafine nanowires and their preparation methods and applications
  • A nitrogen-doped carbon-coated ni&moo <sub>2</sub> Ultrafine nanowires and their preparation methods and applications
  • A nitrogen-doped carbon-coated ni&moo <sub>2</sub> Ultrafine nanowires and their preparation methods and applications

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Nitrogen-doped carbon-coated Ni and MoO grown on carbon cloth 2 A method for preparing a composite nanowire material of nanoparticles, comprising the steps of:

[0038] 1) First, take 0.3g of ammonium molybdate tetrahydrate, 0.2g of nickel nitrate hexahydrate and 0.5g of 2-methylimidazole, and sequentially add them to 40mL of methanol solvent, and stir to obtain a homogeneous solution;

[0039] 2) Transfer the solution obtained in step 1) to a 50mL reactor, and vertically place a 20.0mm×30.0mm carbon cloth in it, and conduct solvothermal reaction at 160°C for 24h;

[0040] 3) After cooling down to room temperature, take out the carbon cloth sample from the reaction kettle in step 2), wash it with deionized water and absolute ethanol three times respectively, and dry it in a vacuum oven at 70°C to obtain the carbon cloth sample grown on carbon cloth. On-cloth, nickel-containing polymolybdate organic-inorganic nanowire precursors;

[0041] 4) with step 3) the product obta...

Embodiment 2

[0046] 1) Take 0.3g of ammonium molybdate tetrahydrate, 0.2g of nickel nitrate hexahydrate and 0.5g of 2-methylimidazole, add them to 40mL of methanol solvent in sequence, and stir to obtain a homogeneous solution;

[0047] 2) Transfer the solution obtained in step 1) to a 50mL reactor, and vertically place a 20.0mm×30.0mm carbon cloth in it, and conduct a solvothermal reaction at 180°C for 24h;

[0048] 3) After cooling down to room temperature, take out the carbon cloth sample from the reaction kettle in step 2), wash it with deionized water and absolute ethanol three times respectively, and dry it in a vacuum oven at 70°C to obtain the carbon cloth sample grown on carbon cloth. On-cloth, nickel-containing polymolybdate organic-inorganic nanowire precursors;

[0049] 4) with step 3) the product obtained in Ar / H 2 Gradient temperature calcination is carried out under the atmosphere, the calcination temperature of the first step is 280°C, the calcination time is 2h, and the h...

Embodiment 3

[0052] 1) Take 0.3g of ammonium molybdate tetrahydrate, 0.2g of nickel nitrate hexahydrate and 0.5g of 2-methylimidazole, add them to 40mL of methanol solvent in sequence, and stir to obtain a homogeneous solution;

[0053] 2) Transfer the solution obtained in step 1) to a 50mL reactor, and vertically place a 20.0mm×30.0mm carbon cloth in it, and conduct a solvothermal reaction at 160°C for 20h;

[0054] 3) After cooling down to room temperature, take out the carbon cloth sample from the reaction kettle in step 2), wash it with deionized water and absolute ethanol three times respectively, and dry it in a vacuum oven at 70°C to obtain the carbon cloth sample grown on carbon cloth. On-cloth, nickel-containing polymolybdate organic-inorganic nanowire precursors;

[0055] 4) with step 3) the product obtained in Ar / H 2 Gradient temperature calcination is carried out under the atmosphere, the calcination temperature of the first step is 280°C, the calcination time is 2h, and the h...

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Abstract

The invention relates to Ni&MoO coated with nitrogen-doped carbon 2 Ultra-fine nanowires and their preparation methods and applications. The material can be used as a high-activity, high-stability hydrogen evolution reaction electrocatalyst, which is grown on carbon cloth in an array. The nanowires are composed of Ni nanoparticles and MoO 2 The nanoparticles are embedded in a nitrogen-doped carbon layer, the diameter of the nanowire is 10-20nm, the length is 1-2μm, and the specific surface area of ​​the nanowire material is 87.1m 2 g ‑1 , there is a protective nitrogen-doped carbon layer on its surface. The beneficial effect of the invention is that: when the invention is used as a hydrogen evolution reaction material, it exhibits excellent catalytic activity and durability for the hydrogen evolution reaction, and is a potential application material for high-efficiency and low-cost hydrogen evolution reaction electrocatalysts.

Description

technical field [0001] The invention belongs to the field of energy and catalytic materials, in particular to a nitrogen-doped carbon-coated Ni&MoO 2 The ultrafine nanowire and its preparation method and application, the material can be used as a highly active and highly stable hydrogen evolution reaction electrocatalyst. Background technique [0002] With the rapid consumption of fossil energy and the increasingly prominent environmental problems, hydrogen has been considered as one of the cleanest and most promising energy sources. Commercially, hydrogen is mainly produced through the vaporization of coal, but the emission of carbon dioxide and environmental pollution are unavoidable and neglected. Hydrogen evolution reaction, as a half-reaction of electrolysis of water, is a non-polluting technology capable of producing high-purity hydrogen. Efficient electrocatalysts for hydrogen evolution reaction need to meet the requirements of accelerating the cathodic reaction and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/07B22F1/0547B22F1/16
Inventor 麦立强刘熊温波郭瑞婷
Owner WUHAN UNIV OF TECH
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