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Preparation method of ultrafine single crystal platinum nanotubes with openings at both ends of 1nm ultrathin tube wall

A platinum nanometer and nanotube technology, which is applied in the field of preparation of single crystal platinum nanomaterials, can solve the problems of unable to guarantee the hollow and transparent structure of nanotubes, failing to achieve the minimum size at the same time, and achieve outstanding advantages, simple preparation method, The effect of high active specific surface area

Active Publication Date: 2020-06-30
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comprehensive scientists have found through the preparation and research of Pt nanotubes that most of the synthesized Pt nanotubes have polycrystalline irregular structures, and the radius and tube wall have failed to meet the minimum size standard at the same time. The most important thing is that the nanotubes cannot be guaranteed. Hollow transparent structure with openings at both ends

Method used

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  • Preparation method of ultrafine single crystal platinum nanotubes with openings at both ends of 1nm ultrathin tube wall
  • Preparation method of ultrafine single crystal platinum nanotubes with openings at both ends of 1nm ultrathin tube wall
  • Preparation method of ultrafine single crystal platinum nanotubes with openings at both ends of 1nm ultrathin tube wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Put 0.7 mg of single-crystal Pd nanowire powder with a diameter of 4.8 nm and 1 mL of ethylene glycol solution into a beaker, ultrasonicate at 50 Hz for 120 minutes to promote dissolution, and then put the mixed solution in a water bath, at a temperature of 50 ° C Under magnetic heating and stirring for 20 minutes, the stirring rate was controlled at 245r / min. Subsequently, 2.5mL of chloroplatinic acid solution with a concentration of 6mM was slowly added dropwise to the mixed solution at a rate of 2mL / h, and the temperature was continued at 50°C. Heat and stir for 9 hours, then centrifuge the heated mixture at 6000r / min for 15 minutes, wash it twice with ethanol-acetone solution with a volume ratio of 2:1, and finally dry it in a blast drying oven at 70°C. A large number of regular Pd@Pt core-shell nanowire powders were obtained.

[0024] (2) Dissolve 0.5 mg of Pd@Pt nanowire powder and 0.8 mg of ferric chloride powder prepared in step (1) in 1 mL of hydrochloric a...

Embodiment 2

[0027] (1) Put 0.2 mg of single-crystal Pd nanowire powder with a diameter of 4.8 nm and 1 mL of ethylene glycol solution into a beaker, ultrasonicate at 50 Hz for 70 minutes to promote dissolution, and then put the mixed solution in a water bath, at a temperature of 55 ° C Under magnetic heating and stirring for 30 minutes, the stirring rate was controlled at 220r / min. Subsequently, 2 mL of chloroplatinic acid solution with a concentration of 5 mM was slowly added dropwise to the mixed solution at a rate of 1 mL / h, and continued heating at 55 ° C. After stirring for 10 hours, the heated mixture was centrifuged at 8000r / min for 15 minutes, washed twice with ethanol-acetone solution with a volume ratio of 2:1, and finally dried in a blast drying oven at 70°C to obtain Plenty of regular Pd@Pt core-shell nanowire powders.

[0028] (2) Dissolve 1 mg of Pd@Pt nanowire powder and 0.5 mg of ferric chloride powder prepared in step (1) in 1 mL of hydrochloric acid solution with a pH va...

Embodiment 3

[0032] (1) 1 mg of single crystal Pd nanowire powder with a diameter of 4.8 nm and 1 mL of ethylene glycol solution are put into a beaker, and 50 Hz ultrasonic (50 Hz) is used for 200 minutes to promote dissolution, and then the mixed solution is put into a water bath and heated at 80 Magnetic heating and stirring at a temperature of ℃ for 10 minutes, the stirring rate was controlled at 180r / min, and then, at a rate of 2.5mL / h, 5mL of a chloroplatinic acid solution with a concentration of 3mM was slowly added dropwise to the mixed solution, and continued at 80 Heat and stir at ℃ for 12 hours, then centrifuge the heated mixture at 4000r / min for 15 minutes, wash it twice with ethanol-acetone solution with a volume ratio of 2:1, and finally put it in a blast drying oven at 70℃ After drying, a large number of regular Pd@Pt core-shell nanowire powders are obtained.

[0033] (2) Dissolve 3 mg of Pd@Pt nanowire powder and 0.3 mg of ferric chloride powder prepared in step (1) in 1 mL ...

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Abstract

The invention discloses an ultrafine single crystal platinum nanotube with an ultrathin tube wall of 1nm and openings in two ends. The ultrafine single crystal platinum nanotube is a single crystal Ptnanotube which has an ultrathin diameter of 5.5nm and an ultrathin tube wall of 1nm, is dozens of microns in length and hollow and is provided with openings in two ends. A preparation method of the ultrafine single crystal platinum nanotube mainly comprises the steps of putting Pd nanowire powder and an ethylene glycol solution into a container, stirring, dropwise adding a chloroplatinic acid solution, stirring, carrying out centrifugal treatment, cleaning a product twice by using an ethanol-acetone solution, and drying to obtain Pd@Pt core-shell structure nanowire powder; dissolving the Pd@Pt nanowire powder and ferric trichloride into a hydrochloric acid solution, carrying out magnetic stirring, carrying out centrifugal treatment on the mixed solution and cleaning the product twice by using the hydrochloric acid solution to obtain the ultrafine single crystal platinum nanotube with the ultrathin tube wall of 1nm and the openings in two ends. The preparation method is simple; and theprepared platinum nanotube has the advantages of the ultrathin diameter, the ultrathin tube wall, the overlength, a single crystal structure and ultrahigh active specific surface area, and has very high catalytic activity in oxygen reduction reaction of a positive electrode of a fuel cell.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of a single crystal platinum nanometer material. [0002] technical background [0003] Energy can neither be created nor destroyed, it can only be transformed from one form to another. For example, in fuel cells, chemical substances can convert chemical energy into electrical energy in an efficient and environmentally friendly way through the action of catalysts, which is the main content of scientific research in the era of environmental protection and energy saving. Among them, the proton exchange membrane fuel cell has the characteristics of simple operation, mild reaction conditions, high power output and fast start-up, and is widely used in electric vehicles, electric motorcycles and portable power supply devices. In a fuel cell, the reaction of positive and negative electrodes requires the participation of catalysts to work normally a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/928Y02E60/50
Inventor 高发明陶璐于丹卢雄杨云霞
Owner YANSHAN UNIV
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