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A kind of preparation method of platinum-gold nanocage and its application in catalyst

A gold nanocage and gold nanoparticle technology, which is applied in the field of synthesis of nanomaterials, can solve the problems of reduced catalytic activity and poor stability of platinum-based nanomaterials, and achieve the effects of easy implementation, easy scale-up, and cost reduction

Active Publication Date: 2021-06-08
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a method for preparing platinum-gold nanocages to solve the problems of poor stability and reduced catalytic activity of existing platinum-based nanomaterials in the process of being used as catalysts.

Method used

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  • A kind of preparation method of platinum-gold nanocage and its application in catalyst
  • A kind of preparation method of platinum-gold nanocage and its application in catalyst
  • A kind of preparation method of platinum-gold nanocage and its application in catalyst

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Embodiment 1

[0044] A kind of preparation method of platinum-gold nanocage, described preparation method comprises the steps:

[0045] a. Preparation of gold nanoseed solution: Add 7.5mL 0.5mol / L cetyltrimethylammonium bromide and 87.5μL 0.02mol / L tetrahydrate chloroauric acid tetrahydrate solution in a 50mL round bottom flask, under vigorous stirring Add 0.6 mL of 0.01 mol / L sodium borohydride solution in an ice bath, and then continue stirring at 25°C for 3 hours to obtain a 3-5 nm gold nanometer seed solution. The reaction involved in step a is 8HAuCl 4 ·3H 2 O+3NaBH 4 =8Au+3NaB(OH) 4 +12H 2 O+32HCl

[0046] b. Preparation of cut-angle octahedral gold nanoparticles solution:

[0047] b1. Dilute the gold nano-seed solution obtained in step a 100 times with water to obtain a diluted gold nano-seed solution, add 12mL 0.016mol / L hexadecyltrimethylammonium bromide solution in a round bottom flask, 25 μL 0.02mol / L chloroauric acid tetrahydrate solution, 25 μL 0.0388mol / L sodium citrat...

Embodiment 2

[0062] A thin-film catalyst, described thin-film catalyst is prepared from the cut-angle octahedral platinum-gold nanocage solution that utilizes embodiment 1 to obtain, and its preparation process is as follows:

[0063] Take 2 μL of cut-angle octahedral platinum-gold nanocage solution and drop it on the surface of the conductive material of the glassy carbon plate, volatilize in an oven at 70 degrees Celsius for 10 minutes, repeat this step to obtain a three-dimensional ordered cut-angle octahedral platinum-gold nanocage film with a thickness of 7 μm Catalysts such as Figure 4 As shown, what is shown is the scanning electron microscope image of the obtained angular-cut octahedral platinum-gold nanocage thin film catalyst, and the lower right corner is a structural schematic diagram. porous structure.

Embodiment 3

[0065] The angle-cut octahedral platinum-gold nanocage film catalyst obtained in Example 2 is pretreated by cyclic voltammetry scanning, the voltage range is 0.6 to 1.0 volts, and the electrolyte is 0.1mol / L sulfuric acid, until the cyclic voltammetry can be obtained until repeated.

[0066] Before testing the methanol oxidation performance of the catalyst, the electrolyte (0.1 mol / L sulfuric acid and 1 mol / L methanol) was blown with nitrogen to remove dissolved oxygen for 10 minutes.

[0067] The cleaved octahedral platinum-gold nanocage thin film catalyst, the platinum-coated cleaved octahedral gold nanoparticle catalyst and the 10% Pt / C E-TEK catalyst with the same specific surface area were applied to the catalytic oxidation of methanol. Cyclic voltammetry was compared as Figure 5 Shown are the comparison diagrams of cyclic voltammetry polarization curves of the three catalysts in 0.1mol / L sulfuric acid and 1mol / L methanol solutions, s1, s2, s3 respectively represent the...

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Abstract

The embodiment of the present invention discloses a method for preparing a platinum-gold nanocage, which relates to the technical field of synthesis of nanomaterials. The preparation method includes the following steps: a. preparing a gold nanometer seed solution; b. preparing an angle-cut octahedral gold nanometer Particle solution; c. preparing a solution of platinum-coated octahedral gold nanoparticles; d. etching the solution of platinum-coated octahedral gold nanoparticles to obtain a platinum-gold nanocage solution of octahedrons. The preparation method uses the solution phase stepwise growth method to prepare the cut-angle octahedral gold nanoparticles, and then selectively grows platinum on the corners of the cut-angle octahedron by using the solution phase method, and finally etches most of the gold selectively to form Cutting angle octahedral platinum-gold nanocages; the self-assembly of cutting-angle octahedral platinum-gold nanocages with many corners and corners into an ordered porous film, the film has long-term stability and high specific surface area. field has great application potential.

Description

technical field [0001] The invention relates to the technical field of synthesis of nanomaterials, in particular to a preparation method of a platinum-gold nanocage and its application in catalysts. Background technique [0002] Platinum catalyst is a general term for catalysts made of metal platinum as the main active component. It is mainly used for ammonia oxidation, reforming of petroleum hydrocarbons, oxidation and hydrogenation of unsaturated compounds, removal of carbon monoxide and nitrogen oxides in gases, etc. Process is a kind of catalyst often used in chemical, petroleum and chemical reaction processes. It has high catalytic activity, strong selectivity, convenient catalyst production, and low usage. Component compounding, etc., to optimize catalytic performance. [0003] But because platinum is a rare metal, the price is relatively expensive. Therefore, in the application of industrial catalysis, special attention should be paid to improving the utilization ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/16B22F1/00C22C1/08B82Y30/00B82Y40/00B01J23/52
CPCC22C1/08B82Y30/00B82Y40/00B01J23/52B22F9/16B22F2009/165B22F1/07
Inventor 张立秋陈振煌刘立春
Owner JIAXING UNIV
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