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Platinum-induced aurum core/ palladium platinum island-shaped alloy shell structure nanorod solution and preparation method

A technology of gold nanorods and nanorods, which is applied in the field of platinum-induced gold core/palladium-platinum island alloy shell structure nanorod solutions and preparation methods, can solve the problems of no improvement in catalytic performance, achieve improved catalytic performance, and increase transmission , the effect of reducing dosage

Inactive Publication Date: 2011-05-04
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

M.J.Llorca deposited palladium on the platinum (100) and platinum (111) surfaces to form different coverages. In the formic acid catalytic oxidation experiment, it was found that for the platinum on the (100) surface, the formic acid oxidation potential can be reduced due to the deposition of palladium. Improve catalyst poisoning; but for (111) platinum, the deposition of palladium does not improve the catalytic performance (Journal of Electroanalytical Chemistry, 376 (1994) 151-160)

Method used

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  • Platinum-induced aurum core/ palladium platinum island-shaped alloy shell structure nanorod solution and preparation method
  • Platinum-induced aurum core/ palladium platinum island-shaped alloy shell structure nanorod solution and preparation method
  • Platinum-induced aurum core/ palladium platinum island-shaped alloy shell structure nanorod solution and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Put 1 mL of the gold nanorod solution obtained in the above step 2-(3) into a test tube, and add 40 μL of 2 mM potassium tetrachloroplatinite aqueous solution and 8 μL of 10 mM chloropalladium acid solution to the solution successively, mix well and then add 9.6 μL. .1M ascorbic acid aqueous solution and finally add deionized water to make up to 3mL; mix well and put it in a constant temperature water bath at 30°C. After 30 minutes, the solution turns from light red to gray red, indicating that the gold core / palladium platinum island alloy The formation of shell structure trimetallic nanorods; add 1mL 0.1M hexadecyltrimethylammonium bromide aqueous solution after 5~6 hours, to stabilize gold nucleus / palladium platinum island shape alloy shell structure trimetallic nanorods; The above reaction The solution was centrifuged at 12,000 rpm for 5 minutes; the supernatant was removed, the precipitate was diluted with deionized water to the original volume and ultrasonically dis...

Embodiment 2

[0085] In this example, except that the volume of chloropalladium acid is selected as 20 μL, the remaining steps are the same as in Example 1, and the image of the porous trimetallic nanorod with the gold core / palladium-platinum alloy shell structure obtained is as follows: Figure 4b shown;

[0086] The mass ratio of chloropalladium acid, potassium tetrachloroplatinite and gold nanorods in the mixed solution in this example is 0.08:0.16:1.

Embodiment 3

[0088] In this example, except that the volume of chloropalladium acid is selected as 40 μL, the remaining steps are the same as in Example 1, and the image of the porous trimetallic nanorod with the gold core / palladium-platinum alloy shell structure obtained is as follows: Figure 4c shown;

[0089] The mass ratio of chloropalladium acid, potassium tetrachloroplatinite and gold nanorods in the mixed solution in this example is 0.16:0.16:1.

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Abstract

The invention relates to a platinum-induced aurum core / palladium platinum island-shaped alloy shell structure nanorod solution and a preparation method. The structure consists of a cylindrical aurum nanorod inner core and an island-shaped porous palladium platinum alloy shell coated on the outer surface of the inner core. The preparation method comprises the following steps of: firstly preparing aurum crystal seed solution; secondly, preparing aurum nanorod solution and purifying the aurum nanorod solution; thirdly, mixing the purified aurum nanorod solution, chloropalladate solution and potassium tetrachloroplatinate solution and uniformly shaking the mixture, and adding ascorbic acid water solution into the mixture to obtain mixed solution; and placing the mixed solution in constant-temperature water bath for reaction and then adding hexadecyl trimethyl ammonium bromide water solution into the mixed solution and finally performing the centrifugal separation on the mixed solution to obtain platinum-induced aurum core / palladium platinum island-shaped alloy shell structure nanorod solution. The solution has the advantages of high catalyzing capability, high catalyzing efficiency and high CO poisoning resistance for electrocatalysis oxidation of formic acid, low costs and the like, and is used for directly preparing a formic acid fuel cell catalyst. In addition, the method is simple, low-energy, environmentally-friendly and high-efficiency.

Description

technical field [0001] The invention relates to metal island alloy nanorods and a preparation method thereof, in particular to a porous three-metal nanorod solution with a platinum-induced gold core / palladium-platinum alloy shell structure and a preparation method thereof. The method utilizes gold nanorods As seeds, palladium-platinum alloy island nanostructures were prepared by co-reduction by utilizing the growth characteristics of platinum on the gold surface, and the island nanostructures showed a growth mode dominated by platinum regulation. Background technique [0002] Direct formic acid fuel cells are considered to be the most promising portable energy devices available due to their advantages of easy storage, non-flammability at room temperature, non-toxicity, and environmental friendliness, and may replace existing battery devices. A suitable material for oxidation efficiency is of great importance. Both platinum and palladium can catalyze the oxidation of formic ...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J23/44B01J23/42B01J37/00B01J35/02H01M4/92
CPCY02E60/50
Inventor 张珂吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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