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Island-shaped porous tri-metal nano rod with gold core/silver-platinum alloy shell structure and method for preparing same

A technology of gold nanorods and platinum alloys, applied in the field of metal nanorods and its preparation, can solve problems that have not been seen, and achieve the effects of strong anti-poisoning ability, simple operation, and low price

Inactive Publication Date: 2010-01-13
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the report about Au-Pt-Ag trimetallic catalyst has not been seen yet

Method used

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  • Island-shaped porous tri-metal nano rod with gold core/silver-platinum alloy shell structure and method for preparing same
  • Island-shaped porous tri-metal nano rod with gold core/silver-platinum alloy shell structure and method for preparing same
  • Island-shaped porous tri-metal nano rod with gold core/silver-platinum alloy shell structure and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First prepare the following solutions:

[0043] (1) 0.1M cetyltrimethylammonium bromide (C 19 h 42 N + Br - , hereinafter referred to as CTAB) aqueous solution:

[0044] Weigh 3.64g of cetyltrimethylammonium bromide (analytical grade) and dissolve in 100mL of deionized water; before use, it should be placed in a constant temperature water bath at 30°C to dissolve completely to obtain 0.1M cetyltrimethylammonium bromide ammonium bromide (C 19 h 42 N + Br - , hereinafter referred to as CTAB) aqueous solution;

[0045] (2) 0.1M ascorbic acid (AA) aqueous solution:

[0046] Weigh 0.176g of ascorbic acid (analytical pure) and dissolve it in 10mL of deionized water to obtain a 0.1M ascorbic acid (AA) aqueous solution (the solution can be temporarily prepared before use);

[0047] (3) 10mM tetrachloroauric acid (HAuCl 4 ·3H 2 O) Aqueous solution:

[0048] Weigh 0.393g tetrachloroauric acid (analytical pure, domestic) and dissolve it in 100mL deionized water to pre...

Embodiment 2

[0072] Take 2mL of the platinum-coated gold core / platinum shell structure nanorod solution obtained in step 4 of Example 1 and put it into a test tube, and add 40uL 2mM potassium tetrachloroplatinite aqueous solution and 0.8uL 10mM nitric acid successively to the solution Silver solution, mix well and add 8uL 0.1M ascorbic acid aqueous solution; mix well and put it in a constant temperature water bath at 30°C. After 30 minutes, the solution turns from gray red to dark gray black, which shows the gold core / platinum silver alloy shell structure three Formation of metal nanorods; add 1mL 0.1M hexadecyltrimethylammonium bromide aqueous solution after 5 to 6 hours to stabilize the three metal nanorods with gold core / platinum silver alloy shell structure; Centrifuge at a speed of 5 minutes per minute; remove the supernatant, dilute the precipitate with deionized water to the original volume, ultrasonically disperse, and then centrifuge under the same conditions; Metal nanorods are s...

Embodiment 3

[0075] In this example, except that the volume of silver nitrate is 2.64 μL, the remaining steps are the same as in Example 2, and the obtained image of the island-shaped porous trimetallic nanorod with gold core / silver-platinum alloy shell structure is as follows: Figure 7b shown;

[0076] The weight ratio of silver nitrate, potassium tetrachloroplatinite and pure gold nanorods in the mixed solution in this example is 0.3:1:5.9.

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Abstract

The invention relates to an island-shaped porous tri-metal nano rod with a gold core / silver-platinum alloy shell structure, which adopts the gold core / silver-platinum alloy shell structure formed by a cylindrical gold nano rod core and an island-shaped porous silver-platinum alloy shell coated on the outer surface of the cylindrical gold nano rod core. The preparation method comprises the following steps of preparation of gold crystal seed solution, preparation and purification of gold nano rod solution, preparation of solution of a platinum coated gold core / platinum shell nano rod, preparation of island-shaped porous tri-metal nano rod with the gold core / silver-platinum alloy shell structure and the like. The tri-metal nano rod has the advantages of stronger ability of catalyzing the methanol oxidation, stronger CO poisoning resistant ability, lower cost and the like, and can be widely used for preparing a methanol fuel battery catalyst; and the preparation method has the advantages of simplicity, low consumption, environmental protection, and high efficiency, and by the method, the island-shaped porous tri-metal nano rod with the gold core / silver-platinum alloy shell structure with high yield and narrow size distribution can be obtained.

Description

technical field [0001] The invention relates to metal nanorods and a preparation method thereof, in particular to an island-shaped porous trimetallic nanorod with a gold core / silver-platinum alloy shell structure and a preparation method thereof. Island-shaped porous nanoparticles with an alloy structure formed on the surface. The island-shaped trimetallic nanorods with gold core / silver-platinum alloy shell structure have stronger catalytic activity and anti-CO poisoning ability for methanol oxidation, and can be used as catalysts for methanol fuel cells. Background technique [0002] Platinum nanomaterials play an important role in many important chemical reactions due to their excellent catalytic ability. For example, platinum is a widely used catalyst in the fields of fuel cells, petrochemicals, and automobile exhaust purification. However, due to the lack of platinum resources, its price is high. The amount of platinum used for catalysts in the world is nearly 100 tons ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B01J23/38B01J37/03
Inventor 何伟伟吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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