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Preparation method and application of Pt nanoparticles

A technology of nano-particles and solvents, applied in metal processing equipment, electrical components, circuits, etc., can solve the problems of high energy consumption and numerous steps, and achieve the effects of low energy consumption, mild and easy-to-control reaction conditions, and simple processes

Active Publication Date: 2018-11-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Chinese patent CN1425499A discloses a supported noble metal catalyst and its preparation method. The mixed system of ethylene glycol and water is used to heat and reduce the noble metal salt at a certain temperature (60-250° C.) to obtain the noble metal catalyst. Adjust PH, many steps
[0004] In the above method of preparing Pt nanoparticles by reducing Pt salt with ethylene glycol, it needs to be heated to at least 60°C, which requires high energy consumption. In some reactions, the pH needs to be adjusted, and there are many steps.

Method used

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  • Preparation method and application of Pt nanoparticles
  • Preparation method and application of Pt nanoparticles
  • Preparation method and application of Pt nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) Accurately weigh 0.00415g K 2 PtCl 4 (0.001mmol), added to 10mL ethylene glycol (EG), stirred at room temperature for 0.5h.

[0046] (2) Add 10mL deionized water to make H 2 The volume ratio of O to EG was 1:1, and stirred at room temperature (20°C) for 0.5h. A brown-black Pt nanoparticle sol was obtained.

[0047] (3) add ethanol and centrifuge, and then wash four times with a mixed solution of deionized water and ethanol to obtain Pt nanoparticles.

[0048] From figure 1 It can be seen that the Pt nanoparticles are composed of monodisperse nanoflowers (10-15nm) under stirring conditions, and a single nanoflower is composed of 7-10 Pt particles with a diameter of 2-3nm.

[0049] Depend on Figure 5 It can be seen that the prepared Pt nanoparticles have better ORR activity than Pt Black, and the mass specific activity of the former is 1.7 times that of the latter at 0.9V.

Embodiment 2

[0051] (1) Accurately weigh 0.00415g K 2 PtCl 4 (0.01mmol), added to 5mL ethylene glycol (EG), stirred at room temperature for 1.0h.

[0052] (2) Add 5mL deionized water to make H 2 The volume ratio of O to EG was 1:1, and stirred at room temperature (20°C) for 1.0h. A brown-black Pt nanoparticle sol was obtained.

[0053] (3) add ethanol and centrifuge, and then wash four times with a mixed solution of deionized water and ethanol to obtain Pt nanoparticles.

Embodiment 3

[0055] (1) Accurately weigh 0.00415g K 2 PtCl 4 (0.01mmol), added to 2.5mL ethylene glycol (EG), stirred at room temperature for 1.5h.

[0056] (2) Add 2.5mL deionized water to make H 2 The volume ratio of O and EG was 1:1, and stirred at room temperature (20°C) for 1.5h. A brown-black Pt nanoparticle sol was obtained.

[0057] (3) add ethanol and centrifuge, and then wash four times with a mixed solution of deionized water and ethanol to obtain Pt nanoparticles.

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Abstract

The invention discloses a preparation method of Pt nanoparticles. Using water to enhance the reducing ability of ethylene glycol, Pt nanoparticles can be obtained by reducing platinum salts at room temperature; the reducing ability of ethylene glycol can be adjusted by adjusting the volume ratio of water and ethylene glycol to achieve the purpose of controlling the morphology and particle size ofthe nanoparticles. The method of the invention has simple process, mild reaction condition and easy control, and is a simple, high-efficiency and low-energy Pt nanoparticle preparation method, and theprepared Pt nano particles can be widely applied to many fields including fuel cell catalysts.

Description

technical field [0001] The invention relates to a simple preparation method of Pt nanoparticles. Background technique [0002] Pt nanoparticles refer to metal Pt particles with a particle size of less than 100nm. Due to the nano-size effect, they have very different properties from non-nanoparticles, and have a wide range of uses in catalysts, electromagnetic functional materials, photoelectric functional materials, and biomedical materials. . The preparation methods of metal nanoparticles include gas phase method, solid phase method and liquid phase method. In the gas phase method, metal nanoparticles are obtained by heating and evaporating Pt metal raw materials and then condensing them. This method requires complex equipment and high production costs. However, the solid phase method is difficult to prepare Pt nanoparticles below 10nm, and the purity of the product is not high, and the particle distribution is not uniform. The liquid phase method is to reduce the Pt pre...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B33Y40/00H01M4/92
CPCH01M4/925B22F9/24B33Y40/00B22F1/054Y02E60/50
Inventor 邵志刚方达晖唐雪君黄河秦晓平衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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