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Method for controllably loading metal platinum on surface of multi-wall carbon nanotube through in-situ synthesis

A technology of multi-walled carbon nanotubes and metal loading, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high price, low utilization rate, catalyst poisoning, etc., and achieve improved catalytic performance, increased utilization rate, and scalable size control effect

Inactive Publication Date: 2012-12-26
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reasons are as follows: (1) The electrocatalysts are usually precious metals such as Pt and their alloys, which are expensive and have low utilization
(2) The anode catalysts used in fuel cells have low electrocatalytic activity, and intermediate products such as CO produced in the reformed gas or methanol direct oxidation process are likely to poison the catalyst, thereby greatly reducing the performance of the battery
[0005] Therefore, the traditional methods of loading Pt NPs catalysts on the surface of CNTs have many shortcomings. More importantly, most of the above methods do not consider Pt NPs catalysts with controllable shape and size. Controllable Pt NPs catalyst loading on CNTs surface

Method used

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  • Method for controllably loading metal platinum on surface of multi-wall carbon nanotube through in-situ synthesis
  • Method for controllably loading metal platinum on surface of multi-wall carbon nanotube through in-situ synthesis
  • Method for controllably loading metal platinum on surface of multi-wall carbon nanotube through in-situ synthesis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 10.0 mg of MWNTs to 20.0 mL of triethylene glycol, ultrasonically treat it (power 170 W) for 5 min, and then add 30.0 mg of Pt(acac) 2 Add to this suspension, and continue to sonicate for 15 min to make it completely dispersed.

[0027] (2) Under the conditions of magnetic stirring at a rotational speed of 350 r / min and nitrogen deoxygenation for 45 min, the temperature was sequentially raised to (a) 220 °C, (b) 245 °C, (c) at a rate of 2.5 °C / min 262 °C, (d) 296 °C, reflux for 30 min at the corresponding reaction temperature, and cool to room temperature.

[0028] (3) Add 20.0 mL of absolute ethanol to the reactant to dilute the solution, then centrifuge and wash the product 6 times with absolute ethanol (9000 r / min), each centrifugation time is 6 min. Dry in vacuum at 60 °C for 8 h. The Pt / MWNTs nanocomposite material with Pt NPs of different shapes and particle sizes supported on the surface of MWNTs can be obtained.

[0029] ...

Embodiment 2

[0031] (1) Add 10.0 mg of MWNTs to 20.0 mL of triethylene glycol, ultrasonically treat it with an ultrasonic instrument (power 150 W) for 5 min, and then add 10.0 mg of Pt(acac) 2 Add to this suspension, and continue to sonicate for 15 min to make it completely dispersed.

[0032] (2) Under the conditions of magnetic stirring at a rotation speed of 350 r / min and nitrogen deoxygenation for 45 min, the temperature was raised to 245 °C at a rate of 2.5 °C / min, refluxed at this reaction temperature for 30 min, and cooled to room temperature.

[0033] (3) Add 20.0 mL of absolute ethanol to the reactant to dilute the solution, and then centrifuge and wash the product 6 times with absolute ethanol (10000 r / min), each centrifugation time is 4 min. Dry in vacuum at 70 °C for 9 h. That is, Pt / MWNTs nanocomposites with Pt NPs loading of 21 wt% were obtained.

[0034] The scanning electron micrographs of the prepared Pt / MWNTs nanocomposites are shown in figur...

Embodiment 3

[0036] (1) Add 10.0 mg of MWNTs to 20.0 mL of triethylene glycol, ultrasonically treat it (power 170 W) for 5 min, and then add 30.0 mg of Pt(acac) 2 Add to this suspension, and continue to sonicate for 15 min to make it completely dispersed.

[0037] (2) Under the conditions of magnetic stirring at a rotation speed of 350 r / min and nitrogen deoxygenation for 45 min, the temperature was raised to 245 °C at a rate of 2.5 °C / min, refluxed at this reaction temperature for 30 min, and cooled to room temperature.

[0038] (3) Add 20.0 mL of absolute ethanol to the reactant to dilute the solution, then centrifuge and wash the product 6 times with absolute ethanol (9000 r / min), each centrifugation time is 6 min. Dry in vacuum at 65 °C for 10 h. That is, Pt / MWNTs nanocomposites with Pt NPs loading of 50 wt% were obtained.

[0039] The scanning electron micrographs of the prepared Pt / MWNTs nanocomposites are shown in image 3 , it can be seen from ...

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Abstract

The invention discloses a method for controllably loading metal platinum on the surface of a multi-wall carbon nanotube through an in-situ synthesis, which comprises the following steps of: (1) adding 10.0mg of multi-wall carbon nanotube and 10.0mg of platinum acetylacetone into 20.0mL of triethylene glycol, and performing ultrasonic treatment for 20 minutes by using ultrasonic equipment; and (2) and finally preparing a Pt / MWNTs nano composite material through anaerobic heating. The method has the advantages that: the preparation process is simple, convenient and efficient; and the prepared product can be used for cathode and anode catalysts for a direct methanol fuel cell, and also can be applied to cathode and anode catalysts for other fuel cells, and in the fields of gas reforming, pollutant treatment, organic matter cracking, organic matter synthesis and the like.

Description

technical field [0001] The invention relates to a method for controllably loading metal platinum on the surface of multi-wall carbon nanotubes, in particular to a method for controllably loading metal platinum on the surface of multi-wall carbon nanotubes by an in-situ synthesis method. Background technique [0002] A fuel cell is a device that converts the chemical energy of fuel and oxidant directly into electrical energy. Due to the advantages of high energy conversion density, diverse fuels, high reliability, low pollution, low noise, and easy maintenance, fuel cells are gradually becoming mainstream products in the energy field in the new century. Among them, the research on DMFCs and proton exchange membrane fuel cells (PEMFC) is more concerned. However, electrocatalyst has become one of the important factors restricting the commercial application of fuel cells. The reasons are as follows: (1) The electrocatalysts are usually noble metals such as Pt and their alloys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92
CPCY02E60/50
Inventor 邱建丁崔三观梁汝萍王果冲
Owner NANCHANG UNIV
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