One-dimensional nano-wire hydroxyl cerium carbonate/graphene composite material and preparation method thereof

A technology of linear hydroxycarbonic acid and composite materials, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor electrical conductivity, limited application, and commercial application limitations, and achieve improved electrical conductivity, improved stability, and enhanced cracking effect of ability

Active Publication Date: 2018-11-23
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 its commercial application, and the addition of metal hydroxides or metal oxycarbonates can significantly improve the stability of noble metal catalysts; cerium hydroxycarbonate (chemical formula: Ce( CO 3 )OH)

Method used

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  • One-dimensional nano-wire hydroxyl cerium carbonate/graphene composite material and preparation method thereof
  • One-dimensional nano-wire hydroxyl cerium carbonate/graphene composite material and preparation method thereof
  • One-dimensional nano-wire hydroxyl cerium carbonate/graphene composite material and preparation method thereof

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preparation example Construction

[0029] The invention discloses a preparation method of a one-dimensional nanowire hydroxy cerium carbonate / graphene composite material, comprising the following steps:

[0030] 1) Mix graphene oxide solution and ethylene glycol solution, the volume ratio of graphene oxide solution and ethylene glycol solution is 1:(1~3), the mass concentration of graphene oxide solution is 1~10mg / ml; Gained After the solution is ultrasonically treated, a uniform mixed solution is obtained, the ultrasonic time is 20-40min, and the ultrasonic power is 150W.

[0031] 2) Transfer the mixed solution obtained in step 1) to a magnetic stirrer, and add cerium nitrate hexahydrate during the stirring process; the ratio of added cerium nitrate hexahydrate to graphene oxide solution is (2~12) mg : 5ml, stir magnetically to obtain a suspension mixture evenly;

[0032] 3) Add NaCl and urea to the suspension mixture obtained in step 2), the mass ratio of the added NaCl to cerium nitrate hexahydrate is 10: (...

Embodiment 1

[0037] Mix 25ml of graphene oxide solution (3mg / mL) with 25ml of ethylene glycol solution and sonicate for 30min, then transfer to a magnetic stirrer, add 30mg of cerium nitrate hexahydrate, magnetically stir to form a uniform suspension mixture; add 100mgNaCl, 100mg urea, use 1mol / mLNaOH solution to control the pH value of the system to 12, continue to stir for a period of time, put the mixed solution into a stainless steel autoclave lined with 100ml polytetrafluoroethylene, seal it and put it in a constant temperature oven for 200 ℃ water heating for 180min, after the reaction, take out the reactor, let it cool down to room temperature naturally, centrifuge to collect the precipitate, and wash it repeatedly with ethanol / deionized water (1:2) mixture for 6 times, then put the precipitate in a vacuum oven for 60 °C and dried for 12 hours to obtain nanowire cerium hydroxycarbonate / graphene composite material.

[0038] Carry out XRD, SEM analysis to embodiment 1 gained nanowire ...

Embodiment 2

[0043] Mix 25ml of graphene oxide solution (3mg / mL) with 25ml of ethylene glycol solution and sonicate for 30min, then transfer to a magnetic stirrer, add 60mg of cerium nitrate hexahydrate, magnetically stir to form a uniform suspension mixture, add 100mgNaCl, 150mg urea, then use 1mol / mL NaOH solution to control the pH value of the system to 13, after continuing to stir for a period of time, put the mixed solution into a stainless steel autoclave lined with 100ml polytetrafluoroethylene, seal it and put it in a constant temperature Heat water at 200°C in an oven for 180 minutes. After the reaction, take out the reaction kettle, let it cool down to room temperature naturally, collect the precipitate by centrifugation, and wash it repeatedly with ethanol / deionized water (1:2) mixture for 6 times, and then put the precipitate in a vacuum Dry in an oven at 60° C. for 12 hours to obtain a nanowire cerium hydroxycarbonate / graphene composite material.

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Abstract

The invention discloses one-dimensional nano-wire hydroxyl cerium carbonate/graphene composite material and a preparation method thereof. A graphene oxide solution is used as a precursor of a graphenecarrier, a cerium nitrate hexahydrate is taken as a precursor of hydroxyl cerium carbonate, and urea is added to provide carbonate; NaOH is used for providing OH ions, and Ce(CO3)OH is jointly generated with the cerium nitrate hexahydrate; meanwhile, the prepared nano-wire with a single structure generates hydroxyl carbon cerium ore to be uniformly dispersed on the surface of the graphene; the composite material has excellent performances of both hydroxyl cerium carbonate and graphene, so that the stability of the noble metal catalyst is improved while the capability of generating adsorptionstate hydroxyl by the hydroxyl carbon cerium ore via water cracking is achieved; and the composite material is prepared through a simple hydrothermal method, the raw materials are easy to obtain, theproduction efficiency is high, and the method is suitable for industrial production.

Description

【Technical field】 [0001] The invention belongs to the technical field of preparation of cerium hydroxycarbonate / graphene composite material, and in particular relates to a one-dimensional nanowire cerium hydroxycarbonate / 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, the direct alcohol fuel cell has the advantages of high energy density, high energy conversion efficiency, easy storage and transportation of fuel, and environmental friendliness, which makes it an ideal energy supply technology for portable electronic devices, and has receiv...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90
CPCH01M4/8647H01M4/9008H01M4/9083Y02E60/50
Inventor 马飞陈冠君张龙孙兰
Owner XI AN JIAOTONG UNIV
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