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A controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticles based on seed epitaxial growth

A nanoparticle and octahedral technology, applied in the field of controllable preparation of gold@platinum core-shell octahedral nanoparticles, can solve the problems of mismatching and immiscibility between gold and platinum lattices, and achieve uniform size, good stability and shell The effect of easy control of layer thickness

Active Publication Date: 2019-04-09
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The key technical problem to be solved in the present invention is to overcome the lattice mismatch between gold and platinum, immiscibility, the binding energy between gold-platinum atoms is smaller than the binding energy between platinum-platinum atoms and the preparation of existing gold / platinum heterogeneous nanoparticles For the shortcomings in the technology, provide a method for preparing gold@platinum core-shell nanoparticles based on seed epitaxial growth, and prepare highly efficient and stable gold@platinum octahedral nanoparticles with core-shell structure

Method used

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  • A controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticles based on seed epitaxial growth
  • A controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticles based on seed epitaxial growth
  • A controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticles based on seed epitaxial growth

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Embodiment 1

[0026] Preparation of Au@platinum core-shell octahedral nanoparticles with different platinum shell thicknesses

[0027] Preparation of 20 nanometer gold octahedral nanoparticles: Add polydiallyl dimethyl ammonium chloride aqueous solution to 80 ml of ethylene glycol solution, stir well and then add chloroauric acid and sodium hydroxide aqueous solution to obtain prepared gold The reaction precursor solution of octahedral nanoparticles, heat the reaction precursor solution in an oil bath at 200 degrees Celsius, react for 30 minutes, and naturally cool to room temperature to obtain such figure 1 The colloidal solution of red gold octahedral nanoparticles shown in a (left) has a particle size of 20 nanometers, such as figure 1 As shown in b, the concentrations of polydiallyldimethylammonium chloride, chloroauric acid, and sodium hydroxide in the reaction precursor are 0.02 mol / L, 0.0005 mol / L, and 0.0015 mol / L, respectively.

[0028] The platinum shell layer is epitaxially grown on th...

Embodiment 2

[0030] Prepare gold@platinum core-shell octahedral nanoparticles at 150 degrees Celsius: weigh 0.015 g of platinum acetylacetonate with an electronic balance under stirring at room temperature and add 70 ml of pre-prepared gold octahedral nanoparticle colloids. After magnetic stirring for 30 minutes, remove Demagnetize, place the obtained acetylacetonate platinum and gold octahedral nanoparticle mixed solution in an oil bath at 150 degrees Celsius for reaction. The color of the solution gradually changes from red to brown. After 60 minutes, the reaction is stopped. Take it out from the oil bath and cool naturally. After reaching room temperature, use a high-speed centrifuge at 14000 rpm for 60 minutes, then remove the colorless solution from the centrifuge tube to obtain a brown precipitate; then use deionized water to ultrasonically clean the precipitate to obtain a product similar to Figure 8 The gold@platinum core-shell octahedral nanoparticles shown are mixed products of pur...

Embodiment 3

[0032] Gold@platinum core-shell octahedral nanoparticles obtained at a platinum molar ratio of 2:1: Under stirring conditions at room temperature, weigh 0.03 g of platinum acetylacetonate with an electronic balance and add 70 ml of pre-made colloidal gold octahedral nanoparticles. After magnetic stirring for 45 minutes, remove the magnet, and place the obtained acetylacetonate platinum and gold octahedral nanoparticle mixed solution in an oil bath at 230 degrees Celsius for reaction. The color of the solution gradually changes from red to brown. The reaction stops after 30 minutes. Take it out of the oil bath, cool it naturally to room temperature, centrifuge at 14000 rpm for 60 minutes in a high-speed centrifuge, remove the colorless solution in the centrifuge tube to obtain a brown precipitate; then use deionized water to ultrasonically clean the precipitate to prepare To be approximated as Picture 9 The gold@platinum core-shell octahedral nanoparticles shown are mixed produ...

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Abstract

The invention relates to a gold@platinum octahedral nanoparticle with a core-shell structure and a preparation method of the gold@platinum octahedral nanoparticle. The gold@platinum shell-core octahedral nanoparticle is obtained by epitaxial equal-angle deposition and growing of platinum on a surface of the gold octahedral nanoparticle, wherein a core part constituent is gold, and a shell layer constituent is platinum. The preparation comprises the steps of (1) taking poly diallyldimethylammonium chloride as a stabilizer, and preparing an octahedral nanoparticle colloid solution in ethylene glycol by employing a polyalcohol reduction method; and (2) adding an appropriate amount of pentanedione platinum into the gold octahedral nanoparticle colloid solution obtained in the step (1) under a room temperature condition, performing heating reaction under 180-230 DEGC to obtain the brownish gold@platinum shell-core octahedral nanoparticle after uniform stirring. The gold@platinum octahedral shell-core nanoparticle obtained by the preparation method has many performances of catalysis and ultraviolet-visible surface plasma resonance absorption and has important application value in aspects of a low-temperature fuel cell, photochemical catalytic synthesis and the like.

Description

Technical field [0001] The invention relates to a controllable preparation method of gold@platinum core-shell octahedral nano particles based on seed epitaxial growth. Background technique [0002] In low-temperature fuel cells, the precious metal platinum and its alloys are currently the most effective catalysts for accelerating the rate of electrochemical reactions. In addition, platinum is the only platinum group metal that can withstand the acidic environment in fuel cells. However, platinum is a rare precious metal, which is very expensive, which leads to the high cost of low-temperature fuel cells and limits the wide-scale and large-scale application of low-temperature fuel cells. More importantly, its catalytic activity is easily poisoned by carbon monoxide (CO), leading to a sharp decrease in its catalytic performance. Therefore, reducing the amount of platinum in the catalyst, reducing the cost of the catalyst; improving its catalytic activity; enhancing its catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92
CPCH01M4/921H01M4/928Y02E60/50
Inventor 李村成张涛姜春雪李伟韩晓楠徐波
Owner UNIV OF JINAN
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