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Preparation method for synthesizing ultra-thin metal alloy nanosheet array material by means of hydrotalcite topological transformation

A nanosheet array and alloy nanotechnology, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve problems such as the difficulty in the synthesis of ultra-thin two-dimensional metal nanosheets, avoid poor contact, and increase the ratio The effect of uniform surface area and material structure

Active Publication Date: 2017-07-04
BEIJING UNIV OF CHEM TECH
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  • Application Information

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Problems solved by technology

[0004] However, since metal atoms tend to be the closest-packed structure, the synthesis method of traditional chemical reduction of metal salt precursors often obtains the structure of metal nanoparticles, and the ultrathin two-dimensional metal nanosheets with high specific surface area and high surface energy Synthesis is very difficult

Method used

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  • Preparation method for synthesizing ultra-thin metal alloy nanosheet array material by means of hydrotalcite topological transformation
  • Preparation method for synthesizing ultra-thin metal alloy nanosheet array material by means of hydrotalcite topological transformation
  • Preparation method for synthesizing ultra-thin metal alloy nanosheet array material by means of hydrotalcite topological transformation

Examples

Experimental program
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Effect test

Embodiment 1

[0059] a. the foamed nickel base of acid treatment is put into the first reaction kettle obliquely, then add the nickel nitrate that comprises 0.12 mol / liter in this reaction kettle, the iron nitrate of 0.12 mol / liter, the urea of ​​1.5 mol / liter Aqueous solution, then close the reaction kettle, raise the temperature to 120°C and keep it under autogenous pressure for 12 hours to carry out the first hydrothermal reaction, so as to grow nickel-iron hydrotalcite nanosheet arrays perpendicular to the substrate on the surface of the nickel foam substrate;

[0060] b. take out the nickel foam substrate, wash and dry;

[0061] c. The nickel-iron hydrotalcite nanosheet array substrate treated in step b is placed obliquely into the second reaction kettle, and then a solution containing sodium hydroxide in ethylene glycol with a concentration of 0.625 mol / liter is added to the reaction kettle , sealing the reaction kettle, raising the temperature to 160° C. and maintaining it under auto...

Embodiment 2

[0064] Referring to the method in Example 1, the nickel foam substrate is replaced with a copper foam substrate.

Embodiment 3

[0066] Referring to method in embodiment 1, change nickel nitrate into nickel chloride, ferric nitrate into ferric chloride.

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Abstract

The invention discloses a preparation method for synthesizing an ultra-thin metal alloy nanosheet array material by means of hydrotalcite topological transformation, and belongs to the technical field of inorganic advanced nano materials. The preparation method includes the steps that a vertical hydrotalcite nanosheet array is prepared on the surface of a conductive foam substrate; an ethylene glycol solution of sodium hydroxide is used for reducing the hydrotalcite nanosheet array so that a metal alloy nanosheet array can be prepared; and according to the dimensions of alloy nanosheets, the thickness is 1.5-4 nanometers, and the size is 100-800 nanometers. The hydrotalcite nanosheet array can be prepared through a hydrothermal method, the alloy nanosheet array is prepared through the mild homogeneous-phase reduction hydrotalcite nano array by controlling dynamics reaction steps. The alloy nanosheet array prepared through the method is high in specific surface area, good in stability, high in activity, low in price and capable of being used as (including but not limited to) an electrolyzed water hydrogen evolution cathode catalytic material and an electrolyzed water oxygen evolution anode catalytic material.

Description

technical field [0001] The invention belongs to the technical field of inorganic advanced nanometer materials, and in particular relates to a preparation method for synthesizing an ultrathin metal alloy nanosheet array material by topological transformation of hydrotalcite. Background technique [0002] With the gradual depletion of fossil fuels and the gradual increase of environmental pollution caused by the burning of fossil fuels, human beings urgently need to develop new clean energy. Hydrogen energy has the advantages of clean environmental protection, sustainable utilization, high energy density, and simple production process, making it one of the most promising new energy sources at present. There are currently two ways to obtain hydrogen energy: one is to electrolyze water, and the other is to split water through solar energy. However, these two methods of hydrogen production require good catalytic materials, which is also a technical difficulty in current research...

Claims

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Application Information

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IPC IPC(8): C25B11/06C23C18/32
CPCC23C18/32C25B11/091
Inventor 孙晓明邝允李鹏松
Owner BEIJING UNIV OF CHEM TECH
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