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Platinum coated gold nanocrystal material and preparation method and application thereof

A gold nano-coating technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult coating thickness, difficulty in obtaining core nanoparticles with uniform size, etc., and achieves the goal of preparing The method is simple and fast, the catalytic performance is good, and the treatment process is simple.

Active Publication Date: 2017-07-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to obtain the thickness of a thin platinum shell requires precise calculation and strict control of the amount of platinum based on the size of the core. Based on the existing published synthesis methods, it is difficult to obtain core nanoparticles with consistent sizes. Therefore, in non-platinum materials It is very difficult to coat the inner core with a thin platinum shell

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  • Platinum coated gold nanocrystal material and preparation method and application thereof
  • Platinum coated gold nanocrystal material and preparation method and application thereof
  • Platinum coated gold nanocrystal material and preparation method and application thereof

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preparation example Construction

[0035] The invention provides a method for preparing a platinum-coated gold nanocrystal material, comprising the following steps:

[0036] a) Gold nanocrystals, piperazine derivatives and platinum source compounds are mixed and reacted in a solvent to obtain a platinum-coated gold nanocrystal material.

[0037] In the present invention, the platinum-coated gold nanocrystal material can be obtained by mixing and reacting gold nanocrystals, piperazine derivatives and platinum source compounds in a solvent. Wherein, the gold nanocrystals include but are not limited to spherical gold nanocrystals and / or flower-shaped gold nanocrystals; the particle size of the gold nanocrystals is preferably 1 to 100 nm, more preferably 10 to 50 nm, and more preferably 13 nm. ~30nm, most preferably 15nm. The present invention has no special limitation on the source of the gold nanocrystals, wherein the spherical gold nanocrystals can be prepared according to the following method:

[0038] The go...

Embodiment 1

[0055] 1) Synthesis of spherical gold nanocrystals

[0056] Add 100mL double-distilled water into a 250ml volumetric flask, heat to boiling; add 2mL of 1% HAuCl 4 The solution was added to the volumetric flask to obtain HAuCl 4 Aqueous solution, heated to boiling; 4mL of 2% sodium citrate solution by mass percentage was added to the above-mentioned volumetric flask, and continued heating under stirring, the color of the solution changed from light yellow to blue-black, and finally wine red, continued stirring and heating for 1 Hour. Cool at room temperature, centrifuge at 9600rpm for 15min, discard the supernatant to obtain spherical gold nanocrystals with a particle size of 15nm; redisperse the spherical gold nanocrystals in water and make the concentration of spherical gold nanocrystals It is 4nmol / L and is ready for use.

[0057] 2) Synthesis of platinum-coated spherical gold nanocrystals

[0058] according to figure 1 The process shown in the preparation of platinum-c...

Embodiment 2

[0066] 1) Synthesis of spherical gold nanocrystals

[0067] Add 100mL double-distilled water into a 250mL volumetric flask, heat to boiling; add 2mL of 1% HAuCl 4 The solution was added to the volumetric flask to obtain HAuCl 4 Aqueous solution, heated to boiling; 4mL of 2% sodium citrate solution by mass percentage was added to the above-mentioned volumetric flask, and continued heating under stirring, the color of the solution changed from light yellow to blue-black, and finally wine red, continued stirring and heating for 1 Hour. Cool at room temperature, centrifuge at 9600rpm for 15min, discard the supernatant to obtain spherical gold nanocrystals with a particle size of 15nm; redisperse the spherical gold nanocrystals in water and make the concentration of spherical gold nanocrystals It is 4nmol / L and is ready for use.

[0068] 2) Synthesis of platinum-coated spherical gold nanocrystals

[0069] 5ml of the spherical gold nanocrystal solution with a concentration of 4n...

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Abstract

The invention belongs to the field of catalysts, and particularly relates to a platinum coated gold nanocrystal material and a preparation method and application thereof. The preparation method of the platinum coated gold nanocrystal material comprises the following step that firstly, gold nanocrystals, a piperazine derivative and a platinum source compound are mixed and reacted in a solvent to obtain the platinum coated gold nanocrystal material. According to the preparation method, the gold nanocrystal surface can be coated with a thin platinum layer, so that the prepared platinum coated gold nanocrystal material exhibits good catalytic performance. Besides, the preparation method is simple and quick, the treatment process is simple, no strong acid solvents or strong base solvents are utilized, and the preparation method has good application prospects. The experimental result shows that the thickness of the platinum layer of the prepared platinum coated gold nanocrystal material is the thickness of a sub-atom layer or a few of atomic layers.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a platinum-coated gold nanocrystal material and its preparation method and application. Background technique [0002] Due to its excellent characteristics such as high energy density and high energy conversion efficiency, fuel cell technology has been considered as the most potential clean energy at present. Given that the electrochemical reactions, material transport, and energy conversion in fuel cells mainly occur at the electrode-electrolyte interface, the performance of electrocatalysts plays a crucial role in the efficiency of converting chemical energy into electrical energy in fuel cells. Among many electrocatalysts, platinum-based catalytic materials are still the catalysts with the best catalytic performance in fuel cells. However, the disadvantages of platinum, such as high price, low reserves, and instability of platinum-based catalysts, make fuel cells face serious challeng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921Y02E60/50
Inventor 李晓坤陈卫
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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