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Method for preparing Pt-Cu nano sheet-like alloy from aqueous phase

A kind of nano-sheet, water-phase preparation technology

Pending Publication Date: 2020-10-23
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few reports on the efficient synthesis of Pt-Cu nanosheet alloys with two-dimensional sheet structure

Method used

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  • Method for preparing Pt-Cu nano sheet-like alloy from aqueous phase
  • Method for preparing Pt-Cu nano sheet-like alloy from aqueous phase
  • Method for preparing Pt-Cu nano sheet-like alloy from aqueous phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Preparation 1 of Pt-Cu nano flake alloy

[0025] With copper chloride as solute and deionized water as solvent, configure 30 milliliters of copper chloride solution with a concentration of 45 mmol / L; add 1.0 g of cetyltrimethylammonium chloride and stir for 20 minutes; add 4 Milliliters, the concentration is 1.0 mol / liter ascorbic acid, stirs 5 minutes; Add 4 milliliters, the concentration is the chloroplatinic acid of 10 mmoles / liters in the mixed solution, put into reaction kettle after stirring for 1 minute, at 120 degrees centigrade The reaction time is 1 hour; the obtained product is separated by a centrifuge, firstly dispersed in deionized water and then ultrasonically centrifuged for the second time, dispersed in ethanol for ultrasonically, centrifuged again, repeated twice, and then dried in a blast drying oven , the drying temperature is preferably 40-50 degrees Celsius, and finally a Pt-Cu nano-sheet alloy is obtained.

[0026] We perform X-ray ...

Embodiment 2

[0029] Embodiment 2: Exploration about the formation mechanism of nanosheet structure

[0030] In order to explore the reason of Pt-Cu nano flake alloy, we change "concentration is the cupric chloride solution of 15 mmol / liter" to "concentration is the copper chloride solution of 15 mmol / liter" in embodiment 1, Change "4 milliliters, concentration is the chloroplatinic acid of 10 mmol / liter" to "12 milliliters, concentration is the chloroplatinic acid of 10 mmol / liter ", other conditions are constant, its product X-ray diffraction image is as Figure 5 .

[0031] Figure 5 It can be seen that the product obtained in Example 2 is still a Pt-Cu alloy, and does not contain Cu simple substance. but from Figure 6 From the scanning electron microscope image, we can know that the Pt-Cu nano-alloy structure is a nanosphere with a particle size of about 50nm. From this, we can conclude that when the concentration of copper source increases, the reduction reaction process slows dow...

Embodiment 3

[0032] Embodiment 3: Preparation 2 of Pt-Cu nano flake alloy

[0033] In order to explore the influence of the heating rate on the structure of the product, we changed the "reaction at 120 degrees Celsius, the reaction time is 1 hour" in Example 1 to "react at 80 degrees Celsius, the reaction time is 1 hour, and then react at 120 degrees Celsius. Reaction, the reaction time is 1 hour" other experimental conditions remain unchanged. The scanning electron microscope image is Figure 7 .

[0034] From Figure 7 It can be seen that the obtained product is still a sheet structure, which shows that the method can form alloy nanosheets under the experimental environment of 120 degrees Celsius, and the structure of the obtained product is not affected by the heating rate, and the repeatability is high.

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Abstract

The invention provides a method for preparing Pt-Cu nano sheet-like alloy from an aqueous phase, and belongs to the technical field of metal nano material preparation. The preparation process comprises the steps that a copper chloride solution is prepared to serve as a precursor of a copper source, hexadecyl trimethyl ammonium chloride serving as a surfactant is added at normal temperature and isstirred to be uniform, ascorbic acid serving as a reducing agent is added, platinum source chloroplatinic acid is added, and co-reduction is carried out at 120 DEG C in a hydrothermal manner to obtainan alloy product. Researches show that the high-concentration copper source is the cause of generation of the nano sheet-like alloy. After increasing the concentration of copper ions, the concentration of the reducing agent relative to the precursor is reduced, the reaction rate is reduced, the nucleation rate is inhibited, nanocrystalline assists a (111) crystal face to grow in the [211] direction under the action of hexadecyl trimethyl ammonium chloride, and finally, the two-dimensional sheet-like alloy nano material is formed. The method is environmentally friendly and low in production cost, and the preparation environment is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterial preparation, in particular to an invention for preparing Pt-Cu nano sheet alloy. Background technique [0002] In recent years, with the increasing demand for energy, traditional fossil energy cannot meet people's production and living needs, and research and development of new energy technologies has gradually become a research focus. Among many energy technologies, methanol fuel cells have attracted much attention due to their high energy density, portability and storage. At present, the main focus of methanol fuel cell performance optimization is the selection of catalysts on both sides of the electrode. Although noble metal materials have high catalytic efficiency, their high cost makes it difficult to produce them on a large scale. Copper is one of the earliest metals discovered by human beings, and it has abundant storage in our country. The presence of copper atoms can effecti...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB22F9/24B82Y40/00B22F1/0551B22F1/068B22F1/07B22F1/054
Inventor 杨文龙梁宸刘欣美熊燕玲林家齐
Owner HARBIN UNIV OF SCI & TECH
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