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A kind of Pt nanoparticle/hydroxycarberite nanocluster/graphene composite material and preparation method thereof

A technology of hydroxycarberesite and composite materials, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of commercial application limitations, loss of platinum catalyst activity and stability, poor stability, etc.

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with existing battery technologies, direct alcohol fuel cells have great advantages, but their commercial application is limited
Among them, the low activity and poor stability of noble metal catalysts are the main factors restricting their commercial application.
Taking methanol as an example, methanol is oxidized and decomposed under the catalysis of platinum, and generates carbon-oxygen intermediates, which exist in the form of adsorbed carbon monoxide. As the reaction continues, a large number of platinum active sites are occupied by carbon monoxide, which hinders new The adsorption and catalysis of methanol molecules on the active sites of platinum, commonly known as platinum catalyst poisoning, caused a large loss of activity and stability of platinum catalysts

Method used

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  • A kind of Pt nanoparticle/hydroxycarberite nanocluster/graphene composite material and preparation method thereof
  • A kind of Pt nanoparticle/hydroxycarberite nanocluster/graphene composite material and preparation method thereof
  • A kind of Pt nanoparticle/hydroxycarberite nanocluster/graphene composite material and preparation method thereof

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preparation example Construction

[0038] The invention discloses a method for preparing a Pt nanoparticle / hydroxycarbonesite nanocluster / graphene composite material, comprising the following steps:

[0039] Step 1: Preparation of hydroxycarberite nanoclusters / graphene composites

[0040] 1) Mixing graphene oxide solution and ethylene glycol solution with a mass concentration of 1 to 10 mg / ml, the volume ratio of graphene oxide solution and ethylene glycol solution is 1: (1 to 3); ultrasonically treat the resulting solution, and The time is 50-70min, the ultrasonic power is 150W, and a uniform mixed solution is obtained;

[0041] 2) Transfer the mixed solution obtained in step 1) to a magnetic stirrer, add cerium nitrate hexahydrate during the stirring process, and the ratio of the added cerium nitrate hexahydrate to the graphene oxide solution is: (1~8) mg: 2ml, obtain a uniform suspension mixture after continuous stirring;

[0042] 3) Add urea to the suspension mixture obtained in step 2), the mass ratio of...

Embodiment 1

[0055] Embodiment 1: comparative test

[0056] Take 20ml of graphene oxide solution and 20ml of ethylene glycol solution and mix, ultrasonicate for 60min under the condition of ultrasonic power of 150W, then transfer the mixed solution to a magnetic stirrer, use 1mol / ml sodium hydroxide solution to control the system under stirring The pH value is 12, and then the mixed solution is transferred to a reaction kettle lined with 100ml polytetrafluoroethylene, sealed and placed in a constant temperature oven at 200°C for 180min. To room temperature, take out the mixed solution and centrifuge at 8000r / min to collect the precipitate, and use the mixed solution of ethanol / deionized water (1:2) to wash repeatedly by centrifugation for 6 times, and put the washed precipitate into a vacuum oven for vacuum drying at 60°C 12h, standby;

[0057] Weigh 30mg of the ready-to-use sample, put it into 40ml of ethylene glycol solution after gently grinding, sonicate for 90min under the condition ...

Embodiment 2

[0060] Step 1: Preparation of hydroxycarberite nanoclusters / graphene composites

[0061] Take 20ml graphene oxide solution and 20ml ethylene glycol solution and mix, the mass concentration of graphene oxide solution is 4mg / ml; Ultrasonic 60min under the condition that ultrasonic power is 150W; Transfer mixed solution on the magnetic stirrer, in stirring process Add 40mg of cerium nitrate hexahydrate to the mixture, stir evenly, add 150mg of urea, use 1mol / ml NaOH solution to adjust the pH value of the system to 12, then transfer the mixed solution into a reaction kettle lined with 100ml polytetrafluoroethylene , sealed and placed in a constant temperature oven at 200 ° C for 180 min, after the reaction was completed, the reactor was put into water to quickly cool down to room temperature, the mixed solution was taken out and centrifuged at 8000r / min to collect the precipitate, and ethanol / deionized water (1: 2) The mixed solution was repeatedly centrifuged and washed 6 times, ...

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Abstract

The invention discloses Pt nanoparticle / hydroxyl bastnaesite nanocluster / graphene composite and a preparation method thereof. On the basis of hydroxyl bastnaesite nanocluster / graphene composite prepared, a solvothermal method, with chloroplatinic acid as a platinum precursor, is utilized to adjust pH of a reaction solution before oil bathing is performed to reduce platinum from the solution; platinum is dispersed evenly on the surface of the hydroxyl bastnaesite nanocluster / graphene composite and is in tight contact with hydroxyl bastnaesite nanoparticles. The concept herein is simple and clear; the prepared composite has the structural intactness of platinum, hydroxyl bastnaesite and graphene; since hydroxyl bastnaesite attaches to the surface of graphene, alcohol fuel batteries are improved; the high specific surface area of graphene helps improve electrical conductivity; tight contact of the components is achieved; the synergy of the components effectively promotes activity and durability of platinum-catalyzed methanol oxidation. The composite and the preparation method thereof have a promising application prospect.

Description

【Technical field】 [0001] The invention belongs to the field of direct alcohol fuel cells, and relates to a Pt nanoparticle / hydroxycarboneite nanocluster / graphene composite material and a preparation method thereof. 【Background technique】 [0002] In recent decades, the rapid development of portable electronic devices such as mobile phones and computers has led to a rapid increase in energy demand, and also poses new challenges to existing battery technologies. The short standby time of batteries in portable electronic devices is a prominent problem in the current related technical field. In the research of many new battery technologies, direct alcohol fuel cells have the advantages of high energy density, high energy conversion efficiency, easy storage and transportation of fuel, and environmental friendliness. more attention. [0003] Compared with existing battery technologies, direct alcohol fuel cells have great advantages, but their commercial application is subject t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9041H01M4/9083Y02E60/50
Inventor 马飞陈冠君张龙孙兰
Owner XI AN JIAOTONG UNIV
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