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Preparation method of nano-particles with nano-grade porous structure

A nanoporous and nanoparticle technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problem of limited material system, uneven particle size distribution, difficulty in mass production and satisfying practical applications Demand and other issues, to achieve the effect of simple method and conducive to large-scale production

Inactive Publication Date: 2013-11-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these preparation methods are usually affected by factors such as temperature, concentration, and chemical properties of precursors, and the material systems that can be realized are limited, which affects the uniformity of product structure and components.
Moreover, the number of nanoparticles with nanoporous structure that can be prepared in a single batch is generally at the level of milligrams to several grams, which is difficult to achieve mass production and meet the needs of practical applications.
Another way of thinking is to crush the aforementioned nanoporous sheet or large particles, and then find that the traditional ball milling technology can only crush the material to the micron scale, and the particle size distribution is uneven. Extrusion will also destroy the original nanoporous structure

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for preparing nanoparticles with a nanoporous structure, comprising the following steps:

[0039] (1) Weigh Pt, Ni, and Al according to the atomic ratio of 1:1:8, and place them in an electric arc furnace to melt into a PtNiAl alloy;

[0040] (2) The PtNiAl alloy is made into thin strips with a width of 5 mm, a length of 30 mm, and a thickness of 100 μm by the quenching strip method;

[0041] (3) In 0.5mol / L NaOH solution, soak and corrode the PtNiAl alloy for 48 hours to dissolve the active metal component Al; after the corrosion is completed, take out the strips and clean them to obtain a platinum-nickel nanoporous alloy;

[0042] (4) PtNi nanoporous alloys were placed in ethanol and ultrasonicated for 5 min to prepare PtNi alloy nanoparticles with nanoporous structure.

[0043] The scanning electron microscope photos of the prepared PtNi alloy nanoparticles with nanoporous structure are as follows: figure 1 shown by figure 1 It can be seen that the size o...

Embodiment 2

[0052] A method for preparing nanoparticles with a nanoporous structure, comprising the following steps:

[0053] (1) Weigh Pt, Co, and Al according to the atomic ratio of 1:1:8, and place them in an electric arc furnace to melt them into PtCoAl alloys;

[0054] (2) The PtCoAl alloy is made into thin strips with a width of 5 mm, a length of 100 mm, and a thickness of 80 μm by the quenching strip method;

[0055] (3) In 0.1mol / L HCl solution, immerse and corrode the PtCoAl alloy for 48 hours to dissolve the active metal component Al and partially dissolve the moderately active metal Co; after the corrosion is completed, take out the strip and clean it. Prepared platinum-cobalt nanoporous alloy;

[0056] (4) The platinum-cobalt nanoporous alloy was placed in methanol and ultrasonicated for 5 minutes to prepare PtCo alloy nanoparticles with a nanoporous structure.

[0057] The scanning electron micrographs of the prepared PtCo alloy nanoparticles with nanoporous structure are a...

Embodiment 3

[0062] A method for preparing nanoparticles with a nanoporous structure, comprising the following steps:

[0063] (1) Weigh Pt, Cu, and Al according to the ratio of atomic ratio of 1.5:0.5:8, and place them in an electric arc furnace to melt into PtCuAl alloy;

[0064] (2) The PtCuAl alloy is made into thin strips with a width of 3 mm, a length of 35 mm, and a thickness of 200 μm by the quenching strip method;

[0065] (3) In 1.0mol / L NaOH solution, immerse and corrode the PtCuAl alloy for 48 hours to dissolve the active metal component Al; after the corrosion is completed, take out the strips and clean them to obtain a platinum-copper nanoporous alloy;

[0066] (4) Put the platinum-copper nanoporous alloy in ethanol, and ultrasonicate for 8 minutes to prepare platinum-copper nanoporous nanoparticles with a nanoporous structure. The particle length is about 100-300nm and the width is about 50-150nm. The whole particle is three-dimensional Nanoporous structure, the size of the...

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Abstract

The invention relates to a preparation method of nano-particles with a nano-grade porous structure. The method comprises the steps that: (1) metals A, M, and N with a certain ratio are smelted in an arc furnace, such that alloy AMN is obtained; (2) with smelting and band-manufacturing processes, the alloy AMN is prepared into a thin band; (3) the alloy AMN thin band is soaked in a corrosion liquid and is corroded for 1-48h, such that the active metal A is dissolved; (4) cleaned nano-grade porous metal N or nano-grade porous alloy MN is placed in an organic solvent; and ultrasonic processing is carried out for 1-1000min, such that the nano-particles with nano-grade porous structure is prepared. The method provided by the invention has the advantages that: (1) various metal components in the alloy can be well controlled; (2) the method is simple; and (3) large amount of the nano-particle sample with the nano-grade porous structure can be prepared, such that the method is suitable for large-scale productions.

Description

technical field [0001] The invention belongs to the technical field of catalysis and electrocatalysis, and relates to a preparation method of nanoparticles with a nanoporous structure, in particular to a preparation method of a nanoporous nanoparticle catalyst which can be used in a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell is a clean and efficient energy conversion device. In a fuel cell, fuel molecules undergo an oxidation reaction under the action of the anode catalyst to generate electrons and protons. The electrons are transmitted to the cathode through an external circuit, and the protons diffuse to the cathode through the proton exchange membrane. Under the action of the cathode catalyst, the electrons and protons convert oxygen Reduction to generate water completes the entire electrochemical reaction. If hydrogen is used as fuel, the only product in the process besides electricity is water, which does no har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/42B01J35/10C22C1/08B82Y30/00B82Y40/00
Inventor 丁轶王荣跃
Owner SHANDONG UNIV
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