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Seed epitaxial growth-based controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticle

A nanoparticle and octahedral technology, which is applied in the field of controllable preparation of gold@platinum core-shell octahedral nanoparticles, can solve the problems of mismatching and immiscibility between the lattices of gold and platinum, and achieve uniform size, good stability, and high yield. high rate effect

Active Publication Date: 2017-07-14
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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  • Seed epitaxial growth-based controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticle
  • Seed epitaxial growth-based controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticle
  • Seed epitaxial growth-based controllable preparation method of single crystal gold@platinum core-shell octahedral nanoparticle

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Embodiment 1

[0026] Preparation of gold@platinum core-shell octahedral nanoparticles with different platinum shell thickness

[0027] Preparation of 20 nanometer gold octahedral nanoparticles: Add polydiallyldimethylammonium 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 For 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 cool naturally to room temperature to obtain the following: figure 1a (left) shows the colloidal solution of red gold octahedral nanoparticles with a particle size of 20 nm, 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] Gold@platinum core-shell octahedral nanopar...

Embodiment 2

[0030] Preparation of gold@platinum core-shell octahedral nanoparticles at 150°C: under stirring at room temperature, add 0.015 g of platinum acetylacetonate to 70 ml of prefabricated gold octahedral nanoparticle colloids with an electronic balance, stir magnetically for 30 minutes, and transfer After demagnetization, place the obtained mixed solution of platinum acetylacetonate and gold octahedral nanoparticles in an oil bath at 150 degrees Celsius for reaction. The color of the solution gradually changes from red to brown, and the reaction stops after 60 minutes. Take it out of the oil bath and let it cool naturally. After reaching room temperature, use a high-speed centrifuge at a speed of 14,000 rpm for 60 minutes, remove the colorless solution in the centrifuge tube to obtain a brown precipitated product; then ultrasonically clean the precipitated product with deionized water to obtain a product similar to Figure 8 The shown hybrid product of gold@platinum core-shell octa...

Embodiment 3

[0032] Gold@platinum core-shell octahedral nanoparticles obtained under the condition that the molar ratio of platinum to gold is 2:1: under the condition of stirring at room temperature, take 0.03 g of platinum acetylacetonate with an electronic balance and add it to 70 ml of prefabricated gold octahedral nanoparticle colloids, After magnetic stirring for 45 minutes, the magnet was removed, and the obtained mixed solution of platinum acetylacetonate and gold octahedral nanoparticles was placed in an oil bath at 230 degrees Celsius for reaction. The color of the solution gradually changed from red to brown, and the reaction stopped after 30 minutes. Take it out from the oil bath, cool it down to room temperature naturally, and centrifuge at a speed of 14,000 rpm for 60 minutes with a high-speed centrifuge, remove the colorless solution in the centrifuge tube to obtain a brown precipitated product; then ultrasonically clean the precipitated product with deionized water to prepare...

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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 nanoparticles based on seed epitaxial growth. Background technique [0002] In low-temperature fuel cells, noble metal platinum and its alloys are currently the most effective catalysts for accelerating 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 and precious metal, and its price is very expensive, resulting in high cost of low-temperature fuel cells, which limits the wide and large-scale application of low-temperature fuel cells. More importantly, its catalytic activity is easily poisoned by carbon monoxide (CO), resulting in a sharp decrease in its catalytic performance. Therefore, reducing the amount of platinum used in the catalyst, reducing the cost of the catalyst; improving its catalytic activity; enhancing its catalytic stabi...

Claims

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Application Information

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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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